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1,169 results on '"Sturm, M."'

153. A Comparison of Snow Depth on Sea Ice Retrievals Using Airborne Altimeters and an AMSR-E Simulator

Author

Cavalieri, D. J, Marksu, T, Ivanoff, A, Miller, J. A, Brucker, L, Sturm, M, Maslanik, J. A, Heinrichs, J. F, Gasiewski, A, Leuschen, C, Krabill, W, and Sonntag, J

Subjects
Earth Resources And Remote Sensing
Abstract

A comparison of snow depths on sea ice was made using airborne altimeters and an Advanced Microwave Scanning Radiometer for the Earth Observing System (AMSR-E) simulator. The data were collected during the March 2006 National Aeronautics and Space Administration (NASA) Arctic field campaign utilizing the NASA P-3B aircraft. The campaign consisted of an initial series of coordinated surface and aircraft measurements over Elson Lagoon, Alaska and adjacent seas followed by a series of large-scale (100 km ? 50 km) coordinated aircraft and AMSR-E snow depth measurements over portions of the Chukchi and Beaufort seas. This paper focuses on the latter part of the campaign. The P-3B aircraft carried the University of Colorado Polarimetric Scanning Radiometer (PSR-A), the NASA Wallops Airborne Topographic Mapper (ATM) lidar altimeter, and the University of Kansas Delay-Doppler (D2P) radar altimeter. The PSR-A was used as an AMSR-E simulator, whereas the ATM and D2P altimeters were used in combination to provide an independent estimate of snow depth. Results of a comparison between the altimeter-derived snow depths and the equivalent AMSR-E snow depths using PSR-A brightness temperatures calibrated relative to AMSR-E are presented. Data collected over a frozen coastal polynya were used to intercalibrate the ATM and D2P altimeters before estimating an altimeter snow depth. Results show that the mean difference between the PSR and altimeter snow depths is -2.4 cm (PSR minus altimeter) with a standard deviation of 7.7 cm. The RMS difference is 8.0 cm. The overall correlation between the two snow depth data sets is 0.59.

Published
2011
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160. Single Molecule Molecular Inversion Probes for High Throughput Germline Screenings in Dystonia

Author

Pogoda, Michaela, Hilke, Franz-Joachim, Lohmann, E., Sturm, M., Lenz, F.A., Matthes, Jakob, Hoischen, A., Schroeder, C., and Grundmann, Kathrin

Subjects
All institutes and research themes of the Radboud University Medical Center, lnfectious Diseases and Global Health Radboud Institute for Molecular Life Sciences [Radboudumc 4]
Abstract

Contains fulltext : 214488.pdf (Publisher’s version ) (Open Access)

Published
2019

161. Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN

Author

KATRIN Collaboration, Aker, M., Altenmüller, K., Arenz, M., Babutzka, M., Barrett, J., Bauer, S., Beck, M., Beglarian, A., Behrens, J., Bergmann, T., Besserer, U., Blaum, K., Block, F., Bobien, S., Bokeloh, K., Bonn, J., Bornschein, B., Bornschein, L., Bouquet, H., Brunst, T., Caldwell, T. S., La Cascio, L., Chilingaryan, S., Choi, W., Corona, T. J., Debowski, K., Deffert, M., Descher, M., Doe, P. J., Dragoun, O., Drexlin, G., Dunmore, J. A., Dyba, S., Edzards, F., Eisenblätter, L., Eitel, K., Ellinger, E., Engel, R., Enomoto, S., Erhard, M., Eversheim, D., Fedkevych, M., Felden, A., Fischer, S., Flatt, B., Formaggio, J. A., Fränkle, F. M., Franklin, G. B., Frankrone, H., Friedel, F., Fuchs, D., Fulst, A., Furse, D., Gauda, K., Gemmeke, H., Gil, W., Glück, F., Görhardt, S., Groh, S., Grohmann, S., Grössle, R., Gumbsheimer, R., Ha Minh, M., Hackenjos, M., Hannen, V., Harms, F., Hartmann, J., Haußmann, N., Heizmann, F., Helbing, K., Hickford, S., Hilk, D., Hillen, B., Hillesheimer, D., Hinz, D., Höhn, T., Holzapfel, B., Holzmann, S., Houdy, T., Howe, M. A., Huber, A., James, T. M., Jansen, A., Kaboth, A., Karl, C., Kazachenko, O., Kellerer, J., Kernert, N., Kippenbrock, L., Kleesiek, M., Klein, M., Köhler, C., Köllenberger, L., Kopmann, A., Korzeczek, M., Kosmider, A., Kovalík, A., Krasch, B., Kraus, M., Krause, H., Kuckert, L., Kuffner, B., Kunka, N., Lasserre, T., Le, T. L., Lebeda, O., Leber, M., Lehnert, B., Letnev, J., Leven, F., Lichter, S., Lobashev, V. M., Lokhov, A., Machatschek, M., Malcherek, E., Müller, K., Mark, M., Marsteller, A., Martin, E. L., Melzer, C., Menshikov, A., Mertens, S., Minter, L. I., Mirz, S., Monreal, B., Morales Guzmán, P. I., Naumann, U., Ndeke, W., Neumann, H., Niemes, S., Noe, M., Oblath, N. S., Ortjohann, H.-W., Osipowicz, A., Ostrick, B., Otten, E., Parno, D. S., Phillips, D. G., Plischke, P., Pollithy, A., Poon, A. W. P., Pouryamout, J., Prall, M., Priester, F., Röllig, M., Röttele, C., Ranitzsch, P. C.-O., Rest, O., Rinderspacher, R., Robertson, R. G. H., Rodenbeck, C., Rohr, P., Roll, Ch., Rupp, S., Ryšavý, M., Sack, R., Saenz, A., Schäfer, P., Schimpf, L., Schlösser, K., Schlösser, M., Schlüter, L., Schön, H., Schönung, K., Schrank, M., Schulz, B., Schwarz, J., Seitz-Moskaliuk, H., Seller, W., Sibille, V., Siegmann, D., Skasyrskaya, A., Slezák, M., Špalek, A., Spanier, F., Steidl, M., Steinbrink, N., Sturm, M., Suesser, M., Sun, M., Tcherniakhovski, D., Telle, H. H., Thümmler, T., Thorne, L. A., Titov, N., Tkachev, I., Trost, N., Urban, K., Vénos, D., Valerius, K., VanDevender, B. A., Vianden, R., Vizcaya Hernández, A. P., Wall, B. L., Wüstling, S., Weber, M., Weinheimer, C., Weiss, C., Welte, S., Wendel, J., Wierman, K. J., Wilkerson, J. F., Wolf, J., Xu, W., Yen, Y.-R., Zacher, M., Zadorozhny, S., Zbořil, M., Zeller, G., AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, KATRIN, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and KATRIN Collaboration

Subjects
Semileptonic decay, Physics - Instrumentation and Detectors, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics::Instrumentation and Detectors, FOS: Physical sciences, General Physics and Astronomy, Kinematics, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], KATRIN, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), mass: scale, neutrino: mass: measured, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, S066MAE, Sensitivity (control systems), Limit (mathematics), structure, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, tritium, formation, S066M2E, Instrumentation and Detectors (physics.ins-det), semileptonic decay, sensitivity, ddc, kinematics, Elementary Particles and Fields, electron: energy spectrum, High Energy Physics::Experiment, Präzisionsexperimente - Abteilung Blaum, Neutrino, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Energy (signal processing), Astrophysics - Cosmology and Nongalactic Astrophysics, experimental results
Abstract

We report on the neutrino mass measurement result from the first four-week science run of the Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are energy analyzed by a high-resolution MAC-E filter. A fit of the integrated electron spectrum over a narrow interval around the kinematic end point at 18.57 keV gives an effective neutrino mass square value of (−1.0−1.1+0.9) eV2. From this, we derive an upper limit of 1.1 eV (90% confidence level) on the absolute mass scale of neutrinos. This value coincides with the KATRIN sensitivity. It improves upon previous mass limits from kinematic measurements by almost a factor of 2 and provides model-independent input to cosmological studies of structure formation.

Published
2019

163. 200-year record of metals in lake sediments and natural background concentrations

Author

Von Gunten, H. R., Sturm, M., and Moser, R. N.

Subjects
Zurich, Switzerland (City) -- Research, Lake sediments -- Research, Heavy metals -- Research, Environmental issues, Science and technology
Abstract

The investigation of metals present in Lake Zurich, Switzerland, covering a time span of 200 years before the present time, reveals that the concentrations of the elements differed less with pre-anthropogenic sediments and represent geochemical background representation. The concentration of copper, zinc and cadmium have steadily increased until about 1960 when stricter environmental laws, public awareness toward environmental protection and the introduction of sewage treatment plants brought a considerable improvement in their concentration levels.

Published
1997

164. Snow Depth and Ice Thickness Measurements From the Beaufort and Chukchi Seas Collected During the AMSR-Ice03 Campaign

Author

Sturm, M, Holmgren, J, Maslanik, J. A, Perovich, D. K, Richter-Menge, J, Stroeve, J. C, Markus, T, Heinrichs, J. F, and Tape, K

Subjects
Earth Resources And Remote Sensing
Abstract

In March 2003, a field validation campaign was conducted on the sea ice near Barrow, AK. The goal of this campaign was to produce an extensive dataset of sea ice thickness and snow properties (depth and stratigraphy) against which remote sensing products collected by aircraft and satellite could be compared. Chief among these were products from the Polarimetric Scanning Radiometer (PSR) flown aboard a NASA P-3B aircraft and the Aqua Advanced Microwave Scanning Radiometer for the Earth Observing System (AMSR-E). The data were collected in four field areas: three on the coastal sea ice near Barrow, AK, and the fourth out on the open ice pack 175 km northeast of Barrow. The snow depth ranged from 9.4-20.8 cm in coastal areas (n = 9881 for three areas) with the thinnest snow on ice that had formed late in the winter. Out in the main pack ice, the snow was 20.6 cm deep (n = 1906). The ice in all four areas ranged from 138-219 cm thick (n = 1952), with the lower value again where the ice had formed late in the winter. Snow layer and grain characteristics observed in 118 snow pits indicated that 44% of observed snow layers were depth hoar; 46% were wind slab. Snow and ice measurements were keyed to photomosaics produced from low-altitude vertical aerial photographs. Using these, and a distinctive three-way relationship between ice roughness, snow surface characteristics, and snow depth, strip maps of snow depth, each about 2 km wide, were produced bracketing the traverse lines. These maps contain an unprecedented level of snow depth detail against which to compare remote sensing products. The maps are used in other papers in this special issue to examine the retrieval of snow properties from the PSR and AMSR-E sensors.

Published
2006
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165. Microwave Signatures of Snow on Sea Ice: Modeling

Author

Powell, D. C, Markus, T, Cavalieri, D. J, Gasiewski, A. J, Klein, M, Maslanik, J. A, Stroeve, J. C, and Sturm, M

Subjects
Meteorology And Climatology
Abstract

Accurate knowledge of snow-depth distribution over sea ice is critical for polar climate studies. Current snow-depth-over-sea-ice retrieval algorithms do not sufficiently account for variations in snow and ice physical properties that can affect the accuracy of retrievals. For this reason, airborne microwave observations were coordinated with ground-based measurements of snow depth and snow properties in the vicinity of Barrow, AK, in March 2003. In this paper, the effects of snowpack properties and ice conditions on microwave signatures are examined using detailed surface-based measurements and airborne observations in conjunction with a thermal microwave-emission model. A comparison of the Microwave Emission Model of Layered Snowpacks (MEMLS) simulations with detailed snowpack and ice data from stakes along the Elson Lagoon and the Beaufort Sea and ra- 'diometer data taken from low-level flights using a Polarimetric Scanning Radiometer (PSR-A) shows that MEMLS can be used to simulate snow on sea ice and is a useful tool for understanding the limitations of the snow-depth algorithm. Analysis of radiance data taken over the Elson Lagoon and the Beaufort Sea using MEMLS suggests that the radiometric differences between the two locations are due to the differences in sea-ice emissivity. Furthermore, measured brightness temperatures suggest that the current snow-depth retrieval algorithm is sufficient for areas of smooth first-year sea ice, whereas new algorithm coefficients are needed for rough first-year sea ice. Snowpack grain size and density remain an unresolved issue for snow-depth retrievals using passive-microwave radiances.

Published
2006
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167. Electron-beam MCM testing and probing

Author

Brunner, M., Schmid, R., Schmitt, R., Sturm, M., and Gessner, O.

Subjects
Semiconductor chips -- Testing, Integrated circuits -- Testing, Business, Engineering and manufacturing industries, Science and technology
Abstract

New electron beam probes for checking multichip module (MCM) substrates do not possess an electrical contact or mechanical movements, enabling efficient verification of the substrates. The conventional e-beam applied in IC probing is not compatible with the MCM substrates, leading to the development of new methods. These methods do not use dedicated adapters and are applicable to pads below 100 micrometers.

Published
1994

168. EOS Aqua AMSR-E Arctic Sea Ice Validation Program

Author

Cavalieri, D. J, Markus, T, Gasiewski, A, Klein, M, Maslanik, J, Sturm, M, Stroeve, J, and Heinrichs, J

Subjects
Oceanography
Abstract

A coordinated Arctic sea ice validation field campaign using the NASA Wallops P-3B aircraft was successfully completed in March 2003. This campaign was part of the program for validating the Earth Observing System (EOS) Aqua Advanced Microwave Scanning Radiometer (AMSR-E) sea ice products. The AMSR-E, designed and built by the Japanese National Space Development Agency for NASA, was launched May 4,2002 on the EOS Aqua spacecraft. The AMSR-E sea ice products include sea ice concentration, sea ice temperature, and snow depth on sea ice. The primary instrument on the P-3B aircraft was the NOAA ETL Polarimetric Scanning Radiometer (PSR) covering the same frequencies and polarizations as the AMSR-E. This paper describes the objectives of each of the seven flights, the Arctic regions overflown, and the coordination among satellite, aircraft, and surface-based measurements. Two of the seven aircraft flights were coordinated with scientists making surface measurements of snow and ice properties including sea ice temperature and snow depth on sea ice at a study area near Barrow, AK and at a Navy ice camp located in the Beaufort Sea. The remaining flights covered portions of the Bering Sea ice edge, the Chukchi Sea, and Norton Sound. Comparisons among the satellite and aircraft PSR data sets are presented.

Published
2004

169. EOS Aqua AMSR-E Arctic Sea Ice Validation Program: Intercomparison Between Modeled and Measured Sea Ice Brightness Temperatures

Author

Stroeve, J, Markus, T, Cavalieri, D. J, Maslanik, J, Sturm, M, Henrichs, J, Gasiewski, A, and Klein, M

Subjects
Earth Resources And Remote Sensing
Abstract

During March 2003, an extensive field campaign was conducted near Barrow, Alaska to validate AQUA Advanced Microwave Scanning Radiometer (AMSR) sea ice products. Field, airborne and satellite data were collected over three different types of sea ice: 1) first year ice with little deformation, 2) first year ice with various amounts of deformation and 3) mixed first year ice and multi-year ice with various degrees of deformation. The validation plan relies primarily on comparisons between satellite, aircraft flights and ground-based measurements. Although these efforts are important, key aspects such as the effects of atmospheric conditions, snow properties, surface roughness, melt processes, etc on the sea ice algorithms are not sufficiently well understood or documented. To improve our understanding of these effects, we combined the detailed, in-situ data collection from the 2003 field campaign with radiance modeling using a radiative transfer model to simulate the top of the atmosphere AMSR brightness temperatures. This study reports on the results of the simulations for a variety of snow and ice types and compares the results with the National Oceanographic and Atmospheric Administration Environmental Technology Laboratory Polarimetric Scanning Radiometer (NOAA) (ETL) (PSR) microwave radiometer that was flown on the NASA P-3.

Published
2004

170. Comparisons of Arctic In-Situ Snow and Ice Data with Airborne Passive Microwave Measurements

Author

Markus, T, Cavalien, D. J, Gasiewski, A, Sturm, M, Klein, M, Maslanik, J, Stroeve, J, Heinrichs, J, Holmgren, J, and Irisov, V

Subjects
Geosciences (General)
Abstract

As part of the AMSR-E sea ice validation campaign in March 2003, aircraft flights over the Arctic sea ice were coordinated with ground measurements of snow and sea ice properties. The surface-based measurements were in the vicinity of Barrow, AK, and at a Navy ice camp located in the Beaufort Sea. The NASA P-3 aircraft was equipped with the NOAA ETL PSR microwave radiometer that has the same frequencies as the AMSR-E sensor. The goal was to validate the standard AMSR-E products ice temperature and snow depth on sea ice. Ground measurements are the only way to validate these parameters. The higher spatial resolution of the PSR instrument (between 30 and 500 m, depending on altitude) enables a better comparison between ground measurements and microwave data because of the expected smaller spatial variability. Maps of PSR data can then be used for further down-scaling to AMSR-E pixel areas. Initial results show a good qualitative agreement between the in-situ snow depths and the PSR data. Detailed studies are underway and latest results will be presented.

Published
2004

172. A large-scale magnetic shield with 106 damping at millihertz frequencies.

Author

Altarev, I., Bales, M., Beck, D. H., Chupp, T., Fierlinger, K., Fierlinger, P., Kuchler, F., Lins, T., Marino, M. G., Niessen, B., Petzoldt, G., Schläpfer, U., Schnabel, A., Singh, J. T., Stoepler, R., Stuiber, S., Sturm, M., Taubenheim, B., and Voigt, J.

Subjects
MAGNETIC shielding, DAMPING (Mechanics), ELECTRIC dipole moments, CHARGE conjugation, TIME reversal, MAGNETIC nanoparticles
Abstract

We present a magnetically shielded environment with a damping factor larger than 1×106 at the mHz frequency regime and an extremely low field and gradient over an extended volume. This extraordinary shielding performance represents an improvement of the state-of-the-art in the difficult regime of damping very low-frequency distortions by more than an order of magnitude. This technology enables a new generation of high-precision measurements in fundamental physics and metrology, including searches for new physics far beyond the reach of accelerator-based experiments. We discuss the technical realization of the shield with its improvements in design. [ABSTRACT FROM AUTHOR]

Published
2015
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174. The KATRIN Superconducting Magnets: Overview and First Performance Results

Author

KATRIN Collaboration, Arenz, M., Baek, W.-J., Beck, M., Beglarian, A., Behrens, J., Bergmann, T., Berlev, A., Besserer, U., Blaum, K., Bode, T., Bornschein, B., Bornschein, L., Brunst, T., Buzinsky, N., Chilingaryan, S., Choi, W. Q., Deffert, M., Doe, P. J., Dragoun, O., Drexlin, G., Dyba, S., Edzards, F., Eitel, K., Ellinger, E., Engel, R., Enomoto, S., Erhard, M., Eversheim, D., Fedkevych, M., Formaggio, J. A., Frankle, F. M., Franklin, G. B., Friedel, F., Fulst, A., Gil, W., Glück, F., Urena, A. G., Grohmann, S., Grössle, R., Gumbsheimer, R., Hackenjos, M., Hannen, V., Harms, F., Haußmann, N., Heizmann, F., Helbing, K., Herz, W., Hickford, S., Hilk, D., Howe, M. A., Huber, A., Jansen, A., Kellerer, J., Kernert, N., Kippenbrock, L., Kleesiek, M., Klein, M., Kopmann, A., Korzeczek, M., Kovalik, A., Krasch, B., Kraus, M., Kuckert, L., Lasserre, T., Lebeda, O., Letnev, J., Lokhov, A., Machatschek, M., Marsteller, A., Martin, E. L., Mertens, S., Mirz, S., Monreal, B., Neumann, H., Niemes, S., Off, A., Osipowicz, A., Otten, E., Parno, D. S., Pollithy, A., Poon, A. W. P., Priester, F., Ranitzsch, P. C.-O., Rest, O., Robertson, R. G. H., Roccati, F., Rodenbeck, C., Röllig, M., Röttele, C., Ryšavý, M., Sack, R., Saenz, A., Schimpf, L., Schlösser, K., Schlösser, M., Schönung, K., Schrank, M., Seitz-Moskaliuk, H., Sentkerestiová, J., Sibille, V., Slezák, M., Steidl, M., Steinbrink, N., Sturm, M., Suchopar, M., Telle, H. H., Thorne, L. A., Thümmler, T., Titov, N., Tkachev, I., Trost, N., Valerius, K., Vénos, D., Vianden, R., Hernández, A. P. V., Weber, M., Weinheimer, C., Weiss, C., Welte, S., Wendel, J., Wilkerson, J. F., Wolf, J., Wüstling, S., Zadoroghny, S., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and KATRIN

Subjects
safety, Speichertechnik - Abteilung Blaum, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, magnet: solenoid, quenching, FOS: Physical sciences, Solenoid, Superconducting magnet, KATRIN, 01 natural sciences, 7. Clean energy, Nuclear physics, beam: alignment, 0103 physical sciences, ddc:530, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Instrumentation, Mathematical Physics, activity report, Physics, Beam diameter, 010308 nuclear & particles physics, Instrumentation and Detectors (physics.ins-det), magnet: superconductivity, Magnetic flux, ddc, Magnetic field, Magnet, flux: magnetic, magnetic field: stability, Physics::Accelerator Physics, Beam (structure), performance
Abstract

International audience; The KATRIN experiment aims for the determination of the effective electron anti-neutrino mass from the tritium beta-decay with an unprecedented sub-eV sensitivity. The strong magnetic fields, designed for up to 6 T, adiabatically guide β-electrons from the source to the detector within a magnetic flux of 191 Tcm2. A chain of ten single solenoid magnets and two larger superconducting magnet systems have been designed, constructed, and installed in the 70-m-long KATRIN beam line. The beam diameter for the magnetic flux varies from 0.064 m to 9 m, depending on the magnetic flux density along the beam line. Two transport and tritium pumping sections are assembled with chicane beam tubes to avoid direct "line-of-sight" molecular beaming effect of gaseous tritium molecules into the next beam sections. The sophisticated beam alignment has been successfully cross-checked by electron sources. In addition, magnet safety systems were developed to protect the complex magnet systems against coil quenches or other system failures. The main functionality of the magnet safety systems has been successfully tested with the two large magnet systems. The complete chain of the magnets was operated for several weeks at 70% of the design fields for the first test measurements with radioactive krypton gas. The stability of the magnetic fields of the source magnets has been shown to be better than 0.01% per month at 70% of the design fields. This paper gives an overview of the KATRIN superconducting magnets and reports on the first performance results of the magnets.

Published
2018

175. Reduction of stored-particle background by a magnetic pulse method at the KATRIN experiment

Author

Bauer , S., Beck , M., Beglarian , A., Behrens , J., Berendes , R., Bergmann , T., Berlev , A., Besserer , U., Blaum , K., Bode , T., Bornschein , B., Bornschein , L., Brunst , T., Buglak , W., Buzinsky , N., Chilingaryan , S., Choi , W.Q., Deffert , M., Doe , P.J., Dragoun , O., Drexlin , G., Dyba , S., Edzards , F., Eitel , K., Ellinger , E., Engel , R., Enomoto , S., Erhard , M., Eversheim , D., Fedkevych , M., Formaggio , J.A., Fränkle , F.M., Franklin , G.B., Friedel , F., Fulst , A., Furse , D., Gil , W., Glück , F., Gonzalez Ureña , A., Grohmann , S., Grössle , R., Gumbsheimer , R., Hackenjos , M., Hannen , V., Harms , F., Haußmann , N., Heizmann , F., Helbing , K., Herz , W., Hickford , S., Hilk , D., Howe , M.A., Huber , A., Jansen , A., Kellerer , J., Kernert , N., Kippenbrock , L., Kleesiek , M., Klein , M., Kopmann , A., Korzeczek , M., Kovalík , A., Krasch , B., Kraus , M., Kuckert , L., Lasserre , T., Lebeda , O., Letnev , J., Lokhov , A., Machatschek , M., Marsteller , A., Martin , E.L., Mertens , S., Mirz , S., Monreal , B., Neumann , H., Niemes , S., Off , A., Osipowicz , A., Otten , E., Parno , D.S., Pollithy , A., Poon , A.W.P., Priester , F., Ranitzsch , P.C.-O., Rest , O., Robertson , R.G.H., Roccati , F., Rodenbeck , C., Röllig , M., Röttele , C., Ryšavý , M., Sack , R., Saenz , A., Schimpf , L., Schlösser , K., Schlösser , M., Schönung , K., Schrank , M., Seitz-Moskaliuk , H., Sentkerestiová , J., Sibille , V., Slezák , M., Steidl , M., Steinbrink , N., Sturm , M., Suchopar , M., Telle , H.H., Thorne , L.A., Thümmler , T., Titov , N., Tkachev , I., Trost , N., Valerius , K., Vénos , D., Vianden , R., Vizcaya Hernández , A.P., Wandkowsky , N., Weber , M., Weinheimer , C., Weiss , C., Welte , S., Wendel , J., Wilkerson , J.F., Wolf , J., Wüstling , S., Zadoroghny , S., Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, and KATRIN

Subjects
radon: nuclide, Neutrino mass, Physics::Instrumentation and Detectors, Background reduction methods, coil, Monte Carlo methods, spectrometer, Radon background, KATRIN, numerical calculations, background: radioactivity, [ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], background: suppression
Abstract

The KATRIN experiment aims to determine the effective electron neutrino mass with a sensitivity of $0.2\,{\text{eV}/c^2}$ (90\% C.L.) by precision measurement of the shape of the tritium \textbeta-spectrum in the endpoint region. The energy analysis of the decay electrons is achieved by a MAC-E filter spectrometer. A common background source in this setup is the decay of short-lived isotopes, such as $^{219}$Rn and $^{220}$Rn, in the spectrometer volume. Active and passive countermeasures have been implemented and tested at the KATRIN main spectrometer. One of these is the magnetic pulse method, which employs the existing air coil system to reduce the magnetic guiding field in the spectrometer on a short timescale in order to remove low- and high-energy stored electrons. Here we describe the working principle of this method and present results from commissioning measurements at the main spectrometer. Simulations with the particle-tracking software Kassiopeia were carried out to gain a detailed understanding of the electron storage conditions and removal processes.

Published
2018

176. First transmission of electrons and ions through the KATRIN beamline

Author

KATRIN Collaboration, Arenz, M., Baek, W.-J., Beck, M., Beglarian, A., Behrens, J., Bergmann, T., Berlev, A., Besserer, U., Blaum, K., Bode, T., Bornschein, B., Bornschein, L., Brunst, T., Buzinsky, N., Chilingaryan, S., Choi, W. Q., Deffert, M., Doe, P. J., Dragoun, O., Drexlin, G., Dyba, S., Edzards, F., Eitel, K., Ellinger, E., Engel, R., Enomoto, S., Erhard, M., Eversheim, D., Fedkevych, M., Fischer, S., Formaggio, J. A., Fränkle, F. M., Franklin, G. B., Friedel, F., Fulst, A., Gil, W., Glück, F., Ureña, A. Gonzalez, Grohmann, S., Grössle, R., Gumbsheimer, R., Hackenjos, M., Hannen, V., Harms, F., Haußmann, N., Heizmann, F., Helbing, K., Herz, W., Hickford, S., Hilk, D., Hillesheimer, D., Howe, M. A., Huber, A., Jansen, A., Kellerer, J., Kernert, N., Kippenbrock, L., Kleesiek, M., Klein, M., Kopmann, A., Korzeczek, M., Kovalík, A., Krasch, B., Kraus, M., Kuckert, L., Lasserre, T., Lebeda, O., Letnev, J., Lokhov, A., Machatschek, M., Marsteller, A., Martin, E. L., Mertens, S., Mirz, S., Monreal, B., Naumann, U., Neumann, H., Niemes, S., Off, A., Ortjohann, H.-W., Osipowicz, A., Otten, E., Parno, D. S., Pollithy, A., Poon, A. W. P., Priester, F., Ranitzsch, P. C.-O., Rest, O., Robertson, R. G. H., Roccati, F., Rodenbeck, C., Röllig, M., Röttele, C., Ryšavý, M., Sack, R., Saenz, A., Schimpf, L., Schlösser, K., Schlösser, M., Schönung, K., Schrank, M., Seitz-Moskaliuk, H., Sentkerestiová, J., Sibille, V., Slezák, M., Steidl, M., Steinbrink, N., Sturm, M., Suchopar, M., Suesser, M., Telle, H. H., Thorne, L. A., Thümmler, T., Titov, N., Tkachev, I., Trost, N., Valerius, K., Vénos, D., Vianden, R., Hernández, A. P. Vizcaya, Weber, M., Weinheimer, C., Weiss, C., Welte, S., Wendel, J., Wilkerson, J. F., Wolf, J., Wüstling, S., and Zadoroghny, S.

Subjects
Ion sources (positive ions, architecture, Spectrometers, Physics, Beam-line instrumentation (beam position and profile monitors, Detector control systems (detector and experiment monitoring and slow-control systems, negative ions, electron beam (EBIS)), algorithms, beamintensity monitors, bunch length monitors), hardware, ddc:530, electron cyclotron resonance (ECR), databases)
Abstract

The Karlsruhe Tritium Neutrino (KATRIN) experiment is a large-scale effort to probe the absolute neutrino mass scale with a sensitivity of 0.2 eV (90% confidence level), via a precise measurement of the endpoint spectrum of tritium ß-decay. This work documents several KATRIN commissioning milestones: the complete assembly of the experimental beamline, the successful transmission of electrons from three sources through the beamline to the primary detector, and tests of ion transport and retention. In the First Light commissioning campaign of autumn 2016, photoelectrons were generated at the rear wall and ions were created by a dedicated ion source attached to the rear section; in July 2017, gaseous 83mKr was injected into the KATRIN source section, and a condensed 83mKr source was deployed in the transport section. In this paper we describe the technical details of the apparatus and the configuration for each measurement, and give first results on source and system performance. We have successfully achieved transmission from all four sources, established system stability, and characterized many aspects of the apparatus.

Published
2018

177. P3717More fresh thrombi in cardio embolic than vascular related acute vessel syndromes

Author

Meuwissen, M, primary, Remmers, M J M, additional, Pertiwi, K R, additional, Scholzel, B E, additional, Versteylen, R J, additional, De Boer, O, additional, Sturm, M F A M, additional, Van Den Hoef, T P, additional, Ijsselmuiden, A J J, additional, Van Norden, A G W, additional, De Jong, T E A M, additional, Haans, H A W, additional, Aarts, R A H M, additional, Vos, L D, additional, and Van Der Wal, A C, additional

Published
2019
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179. Gamma-induced background in the KATRIN main spectrometer

Author

Altenmüller, K., primary, Arenz, M., additional, Baek, W.-J., additional, Beck, M., additional, Beglarian, A., additional, Behrens, J., additional, Berlev, A., additional, Besserer, U., additional, Blaum, K., additional, Block, F., additional, Bobien, S., additional, Bode, T., additional, Bornschein, B., additional, Bornschein, L., additional, Bouquet, H., additional, Brunst, T., additional, Buzinsky, N., additional, Chilingaryan, S., additional, Choi, W. Q., additional, Deffert, M., additional, Doe, P. J., additional, Dragoun, O., additional, Drexlin, G., additional, Dyba, S., additional, Eitel, K., additional, Ellinger, E., additional, Engel, R., additional, Enomoto, S., additional, Erhard, M., additional, Eversheim, D., additional, Fedkevych, M., additional, Formaggio, J. A., additional, Fränkle, F. M., additional, Franklin, G. B., additional, Friedel, F., additional, Fulst, A., additional, Gil, W., additional, Glück, F., additional, Ureña, A. Gonzalez, additional, Grössle, R., additional, Gumbsheimer, R., additional, Hackenjos, M., additional, Hannen, V., additional, Harms, F., additional, Haußmann, N., additional, Heizmann, F., additional, Helbing, K., additional, Herz, W., additional, Hickford, S., additional, Hilk, D., additional, Hillesheimer, D., additional, Howe, M. A., additional, Huber, A., additional, Jansen, A., additional, Karl, C., additional, Kellerer, J., additional, Kernert, N., additional, Kippenbrock, L., additional, Klein, M., additional, Kopmann, A., additional, Korzeczek, M., additional, Kovalík, A., additional, Krasch, B., additional, Kraus, A., additional, Kraus, M., additional, Lasserre, T., additional, Lebeda, O., additional, Lehnert, B., additional, Letnev, J., additional, Lokhov, A., additional, Machatschek, M., additional, Marsteller, A., additional, Martin, E. L., additional, Mertens, S., additional, Mirz, S., additional, Monreal, B., additional, Neumann, H., additional, Niemes, S., additional, Osipowicz, A., additional, Otten, E., additional, Parno, D. S., additional, Pollithy, A., additional, Poon, A. W. P., additional, Priester, F., additional, Ranitzsch, P. C.-O., additional, Rest, O., additional, Robertson, R. G. H., additional, Rodenbeck, C., additional, Röllig, M., additional, Röttele, C., additional, Ryšavý, M., additional, Sack, R., additional, Saenz, A., additional, Schimpf, L., additional, Schlösser, K., additional, Schlösser, M., additional, Schlüter, L., additional, Schrank, M., additional, Seitz-Moskaliuk, H., additional, Sibille, V., additional, Slezák, M., additional, Steidl, M., additional, Steinbrink, N., additional, Sturm, M., additional, Suchopar, M., additional, Tcherniakhovski, D., additional, Telle, H. H., additional, Thorne, L. A., additional, Thümmler, T., additional, Titov, N., additional, Tkachev, I., additional, Trost, N., additional, Valerius, K., additional, Vénos, D., additional, Vianden, R., additional, Hernández, A. P. Vizcaya, additional, Weber, M., additional, Weinheimer, C., additional, Weiss, C., additional, Welte, S., additional, Wendel, J., additional, Wilkerson, J. F., additional, Wolf, J., additional, Wüstling, S., additional, Zadoroghny, S., additional, and Zeller, G., additional

Published
2019
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187. Muon-induced background in the KATRIN main spectrometer

Author

Altenmüller, K., primary, Arenz, M., additional, Baek, W.-J., additional, Beck, M., additional, Beglarian, A., additional, Behrens, J., additional, Bergmann, T., additional, Berlev, A., additional, Besserer, U., additional, Blaum, K., additional, Bobien, S., additional, Bode, T., additional, Bornschein, B., additional, Bornschein, L., additional, Brunst, T., additional, Buzinsky, N., additional, Chilingaryan, S., additional, Choi, W.Q., additional, Deffert, M., additional, Doe, P.J., additional, Dragoun, O., additional, Drexlin, G., additional, Dyba, S., additional, Edzards, F., additional, Eitel, K., additional, Ellinger, E., additional, Engel, R., additional, Enomoto, S., additional, Erhard, M., additional, Eversheim, D., additional, Fedkevych, M., additional, Formaggio, J.A., additional, Fränkle, F.M., additional, Franklin, G.B., additional, Friedel, F., additional, Fulst, A., additional, Gil, W., additional, Glück, F., additional, Gonzalez Ureña, A., additional, Grohmann, S., additional, Grössle, R., additional, Gumbsheimer, R., additional, Hackenjos, M., additional, Hannen, V., additional, Harms, F., additional, Haußmann, N., additional, Heizmann, F., additional, Helbing, K., additional, Herz, W., additional, Hickford, S., additional, Hilk, D., additional, Hillesheimer, D., additional, Howe, M.A., additional, Huber, A., additional, Jansen, A., additional, Kellerer, J., additional, Kernert, N., additional, Kippenbrock, L., additional, Kleesiek, M., additional, Klein, M., additional, Kopmann, A., additional, Korzeczek, M., additional, Kovalík, A., additional, Krasch, B., additional, Kraus, M., additional, Kuckert, L., additional, Lasserre, T., additional, Lebeda, O., additional, Leiber, B., additional, Letnev, J., additional, Linek, J., additional, Lokhov, A., additional, Machatschek, M., additional, Marsteller, A., additional, Martin, E.L., additional, Mertens, S., additional, Mirz, S., additional, Monreal, B., additional, Neumann, H., additional, Niemes, S., additional, Off, A., additional, Osipowicz, A., additional, Otten, E., additional, Parno, D.S., additional, Pollithy, A., additional, Poon, A.W.P., additional, Priester, F., additional, Ranitzsch, P.C.-O., additional, Rest, O., additional, Rink, R., additional, Robertson, R.G.H., additional, Roccati, F., additional, Rodenbeck, C., additional, Röllig, M., additional, Röttele, C., additional, Rovedo, P., additional, Ryšavý, M., additional, Sack, R., additional, Saenz, A., additional, Schimpf, L., additional, Schlösser, K., additional, Schlösser, M., additional, Schönung, K., additional, Schrank, M., additional, Seitz-Moskaliuk, H., additional, Sentkerestiová, J., additional, Sibille, V., additional, Slezák, M., additional, Steidl, M., additional, Steinbrink, N., additional, Sturm, M., additional, Suchopar, M., additional, Suesser, M., additional, Telle, H.H., additional, Thorne, L.A., additional, Thümmler, T., additional, Titov, N., additional, Tkachev, I., additional, Trost, N., additional, Valerius, K., additional, Vénos, D., additional, Vianden, R., additional, Vizcaya Hernández, A.P., additional, Wandkowsky, N., additional, Weber, M., additional, Weinheimer, C., additional, Weiss, C., additional, Welte, S., additional, Wendel, J., additional, Wilkerson, J.F., additional, Wolf, J., additional, Wüstling, S., additional, Zadoroghny, S., additional, and Zeller, G., additional

Published
2019
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189. SHOCK WAVE STUDIES OF SNOW

Author

JOHNSON, J.B., primary, BROWN, J.A., additional, GAFFNEY, E.S., additional, BLAISDELL, G.L., additional, STURM, M., additional, and BARRETT, S.A., additional

Published
1992
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192. Calibration of high voltages at the ppm level by the difference of 83mKr conversion electron lines at the KATRIN experiment

Author

Arenz, M., Baek, W.-J., Beck, M., Beglarian, A., Behrens, J., Bergmann, T., Berlev, A., Besserer, U., Blaum, K., Bode, T., Bornschein, B., Bornschein, L., Brunst, T., Buzinsky, N., Chilingaryan, S., Choi, W. Q., Deffert, M., Doe, P. J., Dragoun, O., Drexlin, G., Dyba, S., Edzards, F., Eitel, K., Ellinger, E., Engel, R., Enomoto, S., Erhard, M., Eversheim, D., Fedkevych, M., Fischer, S., Formaggio, J. A., Fränkle, F. M., Franklin, G. B., Friedel, F., Fulst, A., Gil, W., Glück, F., González Ureña, A., Grohmann, S., Grössle, R., Gumbsheimer, R., Hackenjos, M., Hannen, V., Harms, F., Haußmann, N., Heizmann, F., Helbing, K., Herz, W., Hickford, S., Hilk, D., Hillesheimer, D., Howe, M. A., Huber, A., Jansen, A., Kellerer, J., Kernert, N., Kippenbrock, L., Kleesiek, M., Klein, M., Kopmann, A., Korzeczek, M., Kovalík, A., Krasch, B., Kraus, M., Kuckert, L., Lasserre, T., Lebeda, O., Letnev, J., Lokhov, A., Machatschek, M., Marsteller, A., Martin, E. L., Mertens, S., Mirz, S., Monreal, B., Neumann, H., Niemes, S., Off, A., Osipowicz, A., Otten, E., Parno, D. S., Pollithy, A., Poon, A. W. P., Priester, F., Ranitzsch, P. C.-O., Rest, O., Robertson, R. G. H., Roccati, F., Rodenbeck, C., Röllig, M., Röttele, C., Ryšavý, M., Sack, R., Saenz, A., Schimpf, L., Schlösser, K., Schlösser, M., Schönung, K., Schrank, M., Seitz-Moskaliuk, H., Sentkerestiová, J., Sibille, V., Slezák, M., Steidl, M., Steinbrink, N., Sturm, M., Suchopar, M., Suesser, M., Téllez Nieto, Heréndira, Thorne, L. A., Thümmler, T., Titov, N., Tkachev, I., Trost, N., Valerius, K., Vénos, D., Vianden, R., Hernández, A. P. Vizcaya, Weber, M., Weinheimer, C., Weiss, C., Welte, S., Wendel, J., Wilkerson, J. F., Wolf, J., Wüstling, S., Zadoroghny, S., Arenz, M., Baek, W.-J., Beck, M., Beglarian, A., Behrens, J., Bergmann, T., Berlev, A., Besserer, U., Blaum, K., Bode, T., Bornschein, B., Bornschein, L., Brunst, T., Buzinsky, N., Chilingaryan, S., Choi, W. Q., Deffert, M., Doe, P. J., Dragoun, O., Drexlin, G., Dyba, S., Edzards, F., Eitel, K., Ellinger, E., Engel, R., Enomoto, S., Erhard, M., Eversheim, D., Fedkevych, M., Fischer, S., Formaggio, J. A., Fränkle, F. M., Franklin, G. B., Friedel, F., Fulst, A., Gil, W., Glück, F., González Ureña, A., Grohmann, S., Grössle, R., Gumbsheimer, R., Hackenjos, M., Hannen, V., Harms, F., Haußmann, N., Heizmann, F., Helbing, K., Herz, W., Hickford, S., Hilk, D., Hillesheimer, D., Howe, M. A., Huber, A., Jansen, A., Kellerer, J., Kernert, N., Kippenbrock, L., Kleesiek, M., Klein, M., Kopmann, A., Korzeczek, M., Kovalík, A., Krasch, B., Kraus, M., Kuckert, L., Lasserre, T., Lebeda, O., Letnev, J., Lokhov, A., Machatschek, M., Marsteller, A., Martin, E. L., Mertens, S., Mirz, S., Monreal, B., Neumann, H., Niemes, S., Off, A., Osipowicz, A., Otten, E., Parno, D. S., Pollithy, A., Poon, A. W. P., Priester, F., Ranitzsch, P. C.-O., Rest, O., Robertson, R. G. H., Roccati, F., Rodenbeck, C., Röllig, M., Röttele, C., Ryšavý, M., Sack, R., Saenz, A., Schimpf, L., Schlösser, K., Schlösser, M., Schönung, K., Schrank, M., Seitz-Moskaliuk, H., Sentkerestiová, J., Sibille, V., Slezák, M., Steidl, M., Steinbrink, N., Sturm, M., Suchopar, M., Suesser, M., Téllez Nieto, Heréndira, Thorne, L. A., Thümmler, T., Titov, N., Tkachev, I., Trost, N., Valerius, K., Vénos, D., Vianden, R., Hernández, A. P. Vizcaya, Weber, M., Weinheimer, C., Weiss, C., Welte, S., Wendel, J., Wilkerson, J. F., Wolf, J., Wüstling, S., and Zadoroghny, S.

Abstract

The neutrino mass experiment KATRIN requires a stability of 3 ppm for the retarding potential at − 18.6 kV of the main spectrometer. To monitor the stability, two custom-made ultra-precise high-voltage dividers were developed and built in cooperation with the German national metrology institute Physikalisch-Technische Bundesanstalt (PTB). Until now, regular absolute calibration of the voltage dividers required bringing the equipment to the specialised metrology laboratory. Here we present a new method based on measuring the energy difference of two 83mKr conversion electron lines with the KATRIN setup, which was demonstrated during KATRIN’s commissioning measurements in July 2017. The measured scale factor M=1972.449(10) of the high-voltage divider K35 is in agreement with the last PTB calibration 4 years ago. This result demonstrates the utility of the calibration method, as well as the long-term stability of the voltage divider., Depto. de Física Teórica, Fac. de Ciencias Físicas, TRUE, pub

Published
2018

193. Is Lake Prespa Jeopardizing the Ecosystem of Ancient Lake Ohrid?

Author

Matzinger, A., Jordanoski, M., Veljanoska-Sarafiloska, E., Sturm, M., Müller, B., Wüest, A., Matzinger, A., Jordanoski, M., Veljanoska-Sarafiloska, E., Sturm, M., Müller, B., and Wüest, A.

Abstract

Lake Prespa and Lake Ohrid, located in south-eastern Europe, are two lakes of extraordinary ecological value. Although the upstream Lake Prespa has no surface outflow, its waters reach the 160m lower Lake Ohrid through underground hydraulic connections. Substantial conservation efforts concentrate on oligotrophic downstream Lake Ohrid, which is famous for its large number of endemic and relict species. In this paper, we present a system analytical approach to assess the role of the mesotrophic upstream Lake Prespa in the ongoing eutrophication of Lake Ohrid. Almost the entire outflow from Lake Prespa is found to flow into Lake Ohrid through karst channels. However, 65% of the transported phosphorus is retained within the aquifer. Thanks to this natural filter, Lake Prespa does not pose an immediate threat to Lake Ohrid. However, a potential future four-fold increase of the current phosphorus load from Lake Prespa would lead to a 20% increase (+0.9mg P m−3) in the current phosphorus content of Lake Ohrid, which could jeopardize its fragile ecosystem. While being a potential future danger to Lake Ohrid, Lake Prespa itself is substantially endangered by water losses to irrigation, which have been shown to amplify its eutrophication

Published
2018

194. Calibration of high voltages at the ppm level by the difference of [superscript 83m]Kr conversion electron lines at the KATRIN experiment

Author

Massachusetts Institute of Technology. Department of Physics, Buzinsky, Nicholas Gregory, Formaggio, Joseph A, Sibille, Valerian, Arenz, M., Baek, W.-J., Beck, M., Beglarian, A., Behrens, J., Bergmann, T., Berlev, A., Besserer, U., Blaum, K., Bode, T., Bornschein, B., Bornschein, L., Brunst, T., Chilingaryan, S., Choi, W. Q, Deffert, M., Doe, P. J, Dragoun, O., Drexlin, G., Dyba, S., Edzards, F., Eitel, K., Ellinger, E., Engel, R., Enomoto, S., Erhard, M., Eversheim, D., Fedkevych, M., Fischer, S., Fränkle, F. M, Franklin, G. B, Friedel, F., Fulst, A., Gil, W., Glück, F., Ureña, A. G, Grohmann, S., Grössle, R., Gumbsheimer, R., Hackenjos, M., Hannen, V., Harms, F., Haußmann, N., Heizmann, F., Helbing, K., Herz, W., Hickford, S., Hilk, D., Hillesheimer, D., Howe, M. A, Huber, A., Jansen, A., Kellerer, J., Kernert, N., Kippenbrock, L., Kleesiek, M., Klein, M., Kopmann, A., Korzeczek, M., Kovalík, A., Krasch, B., Kraus, M., Kuckert, L., Lasserre, T., Lebeda, O., Letnev, J., Lokhov, A., Machatschek, M., Marsteller, A., Martin, E. L, Mertens, S., Mirz, S., Monreal, B., Neumann, H., Niemes, S., Off, A., Osipowicz, A., Otten, E., Parno, D. S, Pollithy, A., Poon, A. W P, Priester, F., Ranitzsch, P. C, Rest, O., Robertson, R. G H, Roccati, F., Rodenbeck, C., Röllig, M., Röttele, C., Ryšavý, M., Sack, R., Saenz, A., Schimpf, L., Schlösser, K., Schlösser, M., Schönung, K., Schrank, M., Seitz-Moskaliuk, H., Sentkerestiová, J., Slezák, M., Steidl, M., Steinbrink, N., Sturm, M., Suchopar, M., Suesser, M., Telle, H. H, Thorne, L. A, Thümmler, T., Titov, N., Tkachev, I., Trost, N., Valerius, K., Vénos, D., Vianden, R., Hernández, A. P V, Weber, M., Weinheimer, C., Weiss, C., Welte, S., Wendel, J., Wilkerson, J. F, Wolf, J., Wüstling, S., Zadoroghny, S., Massachusetts Institute of Technology. Department of Physics, Buzinsky, Nicholas Gregory, Formaggio, Joseph A, Sibille, Valerian, Arenz, M., Baek, W.-J., Beck, M., Beglarian, A., Behrens, J., Bergmann, T., Berlev, A., Besserer, U., Blaum, K., Bode, T., Bornschein, B., Bornschein, L., Brunst, T., Chilingaryan, S., Choi, W. Q, Deffert, M., Doe, P. J, Dragoun, O., Drexlin, G., Dyba, S., Edzards, F., Eitel, K., Ellinger, E., Engel, R., Enomoto, S., Erhard, M., Eversheim, D., Fedkevych, M., Fischer, S., Fränkle, F. M, Franklin, G. B, Friedel, F., Fulst, A., Gil, W., Glück, F., Ureña, A. G, Grohmann, S., Grössle, R., Gumbsheimer, R., Hackenjos, M., Hannen, V., Harms, F., Haußmann, N., Heizmann, F., Helbing, K., Herz, W., Hickford, S., Hilk, D., Hillesheimer, D., Howe, M. A, Huber, A., Jansen, A., Kellerer, J., Kernert, N., Kippenbrock, L., Kleesiek, M., Klein, M., Kopmann, A., Korzeczek, M., Kovalík, A., Krasch, B., Kraus, M., Kuckert, L., Lasserre, T., Lebeda, O., Letnev, J., Lokhov, A., Machatschek, M., Marsteller, A., Martin, E. L, Mertens, S., Mirz, S., Monreal, B., Neumann, H., Niemes, S., Off, A., Osipowicz, A., Otten, E., Parno, D. S, Pollithy, A., Poon, A. W P, Priester, F., Ranitzsch, P. C, Rest, O., Robertson, R. G H, Roccati, F., Rodenbeck, C., Röllig, M., Röttele, C., Ryšavý, M., Sack, R., Saenz, A., Schimpf, L., Schlösser, K., Schlösser, M., Schönung, K., Schrank, M., Seitz-Moskaliuk, H., Sentkerestiová, J., Slezák, M., Steidl, M., Steinbrink, N., Sturm, M., Suchopar, M., Suesser, M., Telle, H. H, Thorne, L. A, Thümmler, T., Titov, N., Tkachev, I., Trost, N., Valerius, K., Vénos, D., Vianden, R., Hernández, A. P V, Weber, M., Weinheimer, C., Weiss, C., Welte, S., Wendel, J., Wilkerson, J. F, Wolf, J., Wüstling, S., and Zadoroghny, S.

Abstract

The neutrino mass experiment KATRIN requires a stability of 3 ppm for the retarding potential at − 18.6 kV of the main spectrometer. To monitor the stability, two custom-made ultra-precise high-voltage dividers were developed and built in cooperation with the German national metrology institute Physikalisch-Technische Bundesanstalt (PTB). Until now, regular absolute calibration of the voltage dividers required bringing the equipment to the specialised metrology laboratory. Here we present a new method based on measuring the energy difference of two [superscript 83m]Kr conversion electron lines with the KATRIN setup, which was demonstrated during KATRIN’s commissioning measurements in July 2017. The measured scale factor M = 1972.449(10) of the high-voltage divider K35 is in agreement with the last PTB calibration 4 years ago. This result demonstrates the utility of the calibration method, as well as the long-term stability of the voltage divider., United States. Department of Energy (Grant DEFG02- 97ER41020), United States. Department of Energy (Grant DE-FG02-94ER40818), United States. Department of Energy (Grant DE-SC0004036), United States. Department of Energy (Grant DEFG02-97ER 41033), United States. Department of Energy (Grant DE-FG02-97ER41041), United States. Department of Energy (Grant DE-AC02-05CH11231), United States. Department of Energy (Grant DE-SC00 11091)

Published
2018

196. Effect of the Frame Sealing on the Functionality of a Photovoltaic Module

Author

Vanek, J., Jandová, K., Sturm, M., Hylsky, J., and Strachala, D.

Subjects
PV Module Performance and Reliability, Performance, Reliability and Sustainability of Photovoltaic Modules and Balance of System Components
Abstract

33rd European Photovoltaic Solar Energy Conference and Exhibition; 1799-1801, This article deals with the effect of the quality of moisture isolation of the frame of a solar module on the overall functionality of the module. The main goal is to investigate the causes of frame damage, peeling of the frame seal and decrease in the photovoltaic module performance. The problems were examined using various diagnostic methods. The tested photovoltaic modules have been exposed to simulated climate-like environmental conditions and the mentioned defect has been detected. In this work the results of the investigated failure problem are presented. Measured values obtained from several types of measurements are compared and evaluated.

Published
2017
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197. Passive microwave remote and in situ measurements of Arctic and subarctic snow covers in Alaska

Author

Hall, D. K, Chang, A. T. C, Foster, J. L, Sturm, M, Chacho, E, Benson, C. S, and Garbeil, H

Subjects
Earth Resources And Remote Sensing
Abstract

Airborne and satellite passive microwave measurements acquired simultaneously with ground measurements of depth, density, and stratigraphy of the snow in central and northern Alaska between March 11 and 19, 1988, are reported. A good correspondence in brightness temperature (TB) trends between the aircraft and satellite data was found. An expected inverse correlation between depth hoar thickness and TB was not found to be strong. A persistent TB minimum in both the aircraft and the satellite data was detected along the northern foothills of the Brooks Range. In an area located at about 68 deg 60 min N, 149 deg 20 min W, the TB as recorded from the aircraft microwave sensor dropped by 55 K. Satellite microwave measurements showed a TB decrease of up to 45 K at approximately the same location. An examination of microwave satellite data from 1978 to 1987 revealed that similar low late-winter values were found in approximately the same locations as those observed in March 1988.

Published
1991
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198. Reduction of stored-particle background by a magnetic pulse method at the KATRIN experiment

Author

Arenz, M., primary, Baek, W.-J., additional, Bauer, S., additional, Beck, M., additional, Beglarian, A., additional, Behrens, J., additional, Berendes, R., additional, Bergmann, T., additional, Berlev, A., additional, Besserer, U., additional, Blaum, K., additional, Bode, T., additional, Bornschein, B., additional, Bornschein, L., additional, Brunst, T., additional, Buglak, W., additional, Buzinsky, N., additional, Chilingaryan, S., additional, Choi, W. Q., additional, Deffert, M., additional, Doe, P. J., additional, Dragoun, O., additional, Drexlin, G., additional, Dyba, S., additional, Edzards, F., additional, Eitel, K., additional, Ellinger, E., additional, Engel, R., additional, Enomoto, S., additional, Erhard, M., additional, Eversheim, D., additional, Fedkevych, M., additional, Formaggio, J. A., additional, Fränkle, F. M., additional, Franklin, G. B., additional, Friedel, F., additional, Fulst, A., additional, Furse, D., additional, Gil, W., additional, Glück, F., additional, Ureña, A. Gonzalez, additional, Grohmann, S., additional, Grössle, R., additional, Gumbsheimer, R., additional, Hackenjos, M., additional, Hannen, V., additional, Harms, F., additional, Haußmann, N., additional, Heizmann, F., additional, Helbing, K., additional, Herz, W., additional, Hickford, S., additional, Hilk, D., additional, Howe, M. A., additional, Huber, A., additional, Jansen, A., additional, Kellerer, J., additional, Kernert, N., additional, Kippenbrock, L., additional, Kleesiek, M., additional, Klein, M., additional, Kopmann, A., additional, Korzeczek, M., additional, Kovalík, A., additional, Krasch, B., additional, Kraus, M., additional, Kuckert, L., additional, Lasserre, T., additional, Lebeda, O., additional, Letnev, J., additional, Lokhov, A., additional, Machatschek, M., additional, Marsteller, A., additional, Martin, E. L., additional, Mertens, S., additional, Mirz, S., additional, Monreal, B., additional, Neumann, H., additional, Niemes, S., additional, Off, A., additional, Osipowicz, A., additional, Otten, E., additional, Parno, D. S., additional, Pollithy, A., additional, Poon, A. W. P., additional, Priester, F., additional, Ranitzsch, P. C.-O., additional, Rest, O., additional, Robertson, R. G. H., additional, Roccati, F., additional, Rodenbeck, C., additional, Röllig, M., additional, Röttele, C., additional, Ryšavý, M., additional, Sack, R., additional, Saenz, A., additional, Schimpf, L., additional, Schlösser, K., additional, Schlösser, M., additional, Schönung, K., additional, Schrank, M., additional, Seitz-Moskaliuk, H., additional, Sentkerestiová, J., additional, Sibille, V., additional, Slezák, M., additional, Steidl, M., additional, Steinbrink, N., additional, Sturm, M., additional, Suchopar, M., additional, Telle, H. H., additional, Thorne, L. A., additional, Thümmler, T., additional, Titov, N., additional, Tkachev, I., additional, Trost, N., additional, Valerius, K., additional, Vénos, D., additional, Vianden, R., additional, Hernández, A. P. Vizcaya, additional, Wandkowsky, N., additional, Weber, M., additional, Weinheimer, C., additional, Weiss, C., additional, Welte, S., additional, Wendel, J., additional, Wilkerson, J. F., additional, Wolf, J., additional, Wüstling, S., additional, and Zadoroghny, S., additional

Published
2018
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199. The KATRIN superconducting magnets: overview and first performance results

Author

Arenz, M., primary, Baek, W.-J., additional, Beck, M., additional, Beglarian, A., additional, Behrens, J., additional, Bergmann, T., additional, Berlev, A., additional, Besserer, U., additional, Blaum, K., additional, Bode, T., additional, Bornschein, B., additional, Bornschein, L., additional, Brunst, T., additional, Buzinsky, N., additional, Chilingaryan, S., additional, Choi, W.Q., additional, Deffert, M., additional, Doe, P.J., additional, Dragoun, O., additional, Drexlin, G., additional, Dyba, S., additional, Edzards, F., additional, Eitel, K., additional, Ellinger, E., additional, Engel, R., additional, Enomoto, S., additional, Erhard, M., additional, Eversheim, D., additional, Fedkevych, M., additional, Formaggio, J.A., additional, Fränkle, F.M., additional, Franklin, G.B., additional, Friedel, F., additional, Fulst, A., additional, Gil, W., additional, Glück, F., additional, Ureña, A. Gonzalez, additional, Grohmann, S., additional, Grössle, R., additional, Gumbsheimer, R., additional, Hackenjos, M., additional, Hannen, V., additional, Harms, F., additional, Haußmann, N., additional, Heizmann, F., additional, Helbing, K., additional, Herz, W., additional, Hickford, S., additional, Hilk, D., additional, Howe, M.A., additional, Huber, A., additional, Jansen, A., additional, Kellerer, J., additional, Kernert, N., additional, Kippenbrock, L., additional, Kleesiek, M., additional, Klein, M., additional, Kopmann, A., additional, Korzeczek, M., additional, Kovalík, A., additional, Krasch, B., additional, Kraus, M., additional, Kuckert, L., additional, Lasserre, T., additional, Lebeda, O., additional, Letnev, J., additional, Lokhov, A., additional, Machatschek, M., additional, Marsteller, A., additional, Martin, E.L., additional, Mertens, S., additional, Mirz, S., additional, Monreal, B., additional, Neumann, H., additional, Niemes, S., additional, Off, A., additional, Osipowicz, A., additional, Otten, E., additional, Parno, D.S., additional, Pollithy, A., additional, Poon, A.W.P., additional, Priester, F., additional, Ranitzsch, P.C.-O., additional, Rest, O., additional, Robertson, R.G.H., additional, Roccati, F., additional, Rodenbeck, C., additional, Röllig, M., additional, Röttele, C., additional, Ryšavý, M., additional, Sack, R., additional, Saenz, A., additional, Schimpf, L., additional, Schlösser, K., additional, Schlösser, M., additional, Schönung, K., additional, Schrank, M., additional, Seitz-Moskaliuk, H., additional, Sentkerestiová, J., additional, Sibille, V., additional, Slezák, M., additional, Steidl, M., additional, Steinbrink, N., additional, Sturm, M., additional, Suchopar, M., additional, Telle, H.H., additional, Thorne, L.A., additional, Thümmler, T., additional, Titov, N., additional, Tkachev, I., additional, Trost, N., additional, Valerius, K., additional, Vénos, D., additional, Vianden, R., additional, Hernández, A.P. Vizcaya, additional, Weber, M., additional, Weinheimer, C., additional, Weiss, C., additional, Welte, S., additional, Wendel, J., additional, Wilkerson, J.F., additional, Wolf, J., additional, Wüstling, S., additional, and Zadoroghny, S., additional

Published
2018
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