16 results on '"Ihloff, Ernest E"'
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2. A new cryogenic apparatus to search for the neutron electric dipole moment
- Author
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Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Physics, Bessuille, Jason C., Dow, Karen Ann, Hasell, Douglas K., Ihloff, Ernest E, Kelsey, James E, Kim, Y.J., Maxwell, JD, Milner, Richard G, Redwine, Robert P, Tsentalovich, Evgeni P, Vidal, Chris, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Physics, Bessuille, Jason C., Dow, Karen Ann, Hasell, Douglas K., Ihloff, Ernest E, Kelsey, James E, Kim, Y.J., Maxwell, JD, Milner, Richard G, Redwine, Robert P, Tsentalovich, Evgeni P, and Vidal, Chris
- Abstract
© 2019 IOP Publishing Ltd and Sissa Medialab. A cryogenic apparatus is described that enables a new experiment, nEDM@SNS, with a major improvement in sensitivity compared to the existing limit in the search for a neutron Electric Dipole Moment (EDM). This apparatus uses superfluid 4He to produce a high density of Ultra-Cold Neutrons (UCN) which are contained in a suitably coated pair of measurement cells. The experiment, to be operated at the Spallation Neutron Source at Oak Ridge National Laboratory, uses polarized 3He from an Atomic Beam Source injected into the superfluid 4He and transported to the measurement cells where it serves as a co-magnetometer. The superfluid 4He is also used as an insulating medium allowing significantly higher electric fields, compared to previous experiments, to be maintained across the measurement cells. These features provide an ultimate statistical uncertainty for the EDM of 2-3× 10-28 e-cm, with anticipated systematic uncertainties below this level.
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- 2022
3. LERF - New life for the jefferson laboratory FEL
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Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Balewski, Jan T., Bernauer, Jan Christopher, Bessuille, Jason C., Corliss, Ross Cameron, Cowan, R., Epstein, C, Fisher, P, Friščić, I, Hasell, Douglas K., Ihloff, Ernest E, Kelsey, James E, Lee, S., Moran, Peter William, Milner, R, Palumbo, Daniel C., Steadman, Stephen G, Tschalär, C., Vidal, Chris, Wang, Y., Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Balewski, Jan T., Bernauer, Jan Christopher, Bessuille, Jason C., Corliss, Ross Cameron, Cowan, R., Epstein, C, Fisher, P, Friščić, I, Hasell, Douglas K., Ihloff, Ernest E, Kelsey, James E, Lee, S., Moran, Peter William, Milner, R, Palumbo, Daniel C., Steadman, Stephen G, Tschalär, C., Vidal, Chris, and Wang, Y.
- Abstract
© ERL 2017, the 59th ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs.All right reserved. In 2012 Jefferson Laboratory's energy recovery linac (ERL) driven Free Electron Laser successfully completed a transmission test in which high current CW beam (4.3 mA at 100 MeV) was transported through a 2 mm aperture for 7 hours with beam losses as low as 3 ppm. The purpose of the run was to mimic an internal gas target for DarkLight [1] - an experiment designed to search for a dark matter particle. The ERL was not run again until late 2015 for a brief re-commissioning in preparation for the next phase of DarkLight. In the intervening years, the FEL was rebranded as the Low Energy Recirculator Facility. In 2016 several weeks of operation were allocated to configure the machine for DarkLight with the purpose of exercising - for the first time - an internal gas target in an ERL. Despite a number of challenges, including the inability to energy recover without losses (precluding CW operation), beam was delivered to a target of thickness 1018 cm-2 which represents a three order of magnitude increase in thickness from previous internal target experiments. Details of the machine configuration and operational experience will be discussed.
- Published
- 2021
4. High intensity polarized electron source
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Bates Linear Accelerator Center, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Physics, Tsentalovich, Evgeni P, Bessuille, Jason C., Ihloff, Ernest E, Kelsey, James E, Redwine, Robert P, Vidal, Christopher J, Bates Linear Accelerator Center, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Physics, Tsentalovich, Evgeni P, Bessuille, Jason C., Ihloff, Ernest E, Kelsey, James E, Redwine, Robert P, and Vidal, Christopher J
- Abstract
A proposed new high-luminosity electron–ion collider requires a polarized electron source of extremely high intensity. The MIT-Bates Laboratory, in collaboration with Brookhaven National Laboratory (BNL), has developed a new polarized electron gun that can be operated at currents in the mA range. This paper describes the design of the gun and beam line and also presents the results of the beam tests., DOE (Grants DE-FG02-94ER40818, DE-SC0005807 and DE-SC0008741)
- Published
- 2021
5. Precision Electron-Beam Polarimetry at 1 GeV Using Diamond Microstrip Detectors
- Author
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Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Ihloff, Ernest E., Kowalski, Stanley B., Vidal, Christopher J., Narayan, A., Jones, D., Cornejo, J. C., Dalton, M. M., Deconinck, W., Dutta, D., Gaskell, D., Martin, J. W., Paschke, K. D., Tvaskis, V., Asaturyan, A., Benesch, J., Cates, G., Cavness, B. S., Dillon-Townes, L. A., Hays, G., Jones, R., King, P. M., Kurchaninov, L., Lee, L., McCreary, A., McDonald, M., Micherdzinska, A., Mkrtchyan, A., Mkrtchyan, H., Nelyubin, V., Page, S., Ramsay, W. D., Solvignon, P., Storey, D., Tobias, A., Urban, E., Waidyawansa, B., Wang, P., Zhamkotchyan, S., Ihloff, Ernest E, Kowalski, Stanley B, Vidal, Christopher J, Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Ihloff, Ernest E., Kowalski, Stanley B., Vidal, Christopher J., Narayan, A., Jones, D., Cornejo, J. C., Dalton, M. M., Deconinck, W., Dutta, D., Gaskell, D., Martin, J. W., Paschke, K. D., Tvaskis, V., Asaturyan, A., Benesch, J., Cates, G., Cavness, B. S., Dillon-Townes, L. A., Hays, G., Jones, R., King, P. M., Kurchaninov, L., Lee, L., McCreary, A., McDonald, M., Micherdzinska, A., Mkrtchyan, A., Mkrtchyan, H., Nelyubin, V., Page, S., Ramsay, W. D., Solvignon, P., Storey, D., Tobias, A., Urban, E., Waidyawansa, B., Wang, P., Zhamkotchyan, S., Ihloff, Ernest E, Kowalski, Stanley B, and Vidal, Christopher J
- Abstract
United States. Dept. of Energy (Contract AC05-06OR23177), National Science Foundation (U.S.), Natural Sciences and Engineering Research Council of Canada
- Published
- 2016
6. Transmission of high-power electron beams through small apertures
- Author
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Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Tschalar, Christoph, Bertozzi, William, Cowan, Ray Franklin, Fisher, Peter H., Ihloff, Ernest E., Kelleher, Aidan, Milner, Richard G., Ou, Longwu, Schmookler, Barak Abraham, Alarcon, R., Balascuta, S., Boyce, J.R., Douglas, D., Evtushenko, P., Kalantarians, N., Legg, R., Tennant, C., Zhang, S., Benson, S. V., Neil, G. R., Williams, G. P., Cowan, Ray F, Fisher, Peter H, Ihloff, Ernest E, Milner, Richard G, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Tschalar, Christoph, Bertozzi, William, Cowan, Ray Franklin, Fisher, Peter H., Ihloff, Ernest E., Kelleher, Aidan, Milner, Richard G., Ou, Longwu, Schmookler, Barak Abraham, Alarcon, R., Balascuta, S., Boyce, J.R., Douglas, D., Evtushenko, P., Kalantarians, N., Legg, R., Tennant, C., Zhang, S., Benson, S. V., Neil, G. R., Williams, G. P., Cowan, Ray F, Fisher, Peter H, Ihloff, Ernest E, and Milner, Richard G
- Abstract
Tests were performed to pass a 100 MeV, 430 kWatt c.w. electron beam from the energy-recovery linac at the Jefferson Laboratory's FEL facility through a set of small apertures in a 127 mm long aluminum block. Beam transmission losses of 3 p.p.m. through a 2 mm diameter aperture were maintained during a 7 h continuous run., United States. Dept. of Energy (Contract DE-AC05-060R23177), United States. Dept. of Energy (MIT Nuclear Contract DE-FG02-94ER40818), Commonwealth of Virginia
- Published
- 2016
7. Measured radiation and background levels during transmission of megawatt electron beams through millimeter apertures
- Author
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Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Bertozzi, William, Cowan, Ray Franklin, Fisher, Peter H., Ihloff, Ernest E., Kelleher, Aidan, Milner, Richard G., Ou, Longwu, Schmookler, Barak Abraham, Tschalar, Christoph, Alarcon, R., Balascuta, S., Benson, S.V., Boyce, J. R., Douglas, D., Evtushenko, P., Kalantarians, N., Kossler, W. J., Legg, R., Long, E., Neil, G. R., Tennant, C., Williams, G. P., Zhang, S., Cowan, Ray F, Fisher, Peter H, Ihloff, Ernest E, Milner, Richard G, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Bertozzi, William, Cowan, Ray Franklin, Fisher, Peter H., Ihloff, Ernest E., Kelleher, Aidan, Milner, Richard G., Ou, Longwu, Schmookler, Barak Abraham, Tschalar, Christoph, Alarcon, R., Balascuta, S., Benson, S.V., Boyce, J. R., Douglas, D., Evtushenko, P., Kalantarians, N., Kossler, W. J., Legg, R., Long, E., Neil, G. R., Tennant, C., Williams, G. P., Zhang, S., Cowan, Ray F, Fisher, Peter H, Ihloff, Ernest E, and Milner, Richard G
- Abstract
We report measurements of photon and neutron radiation levels observed while transmitting a 0.43 MW electron beam through millimeter-sized apertures and during beam-off, but accelerating gradient RF-on, operation. These measurements were conducted at the Free-Electron Laser (FEL) facility of the Jefferson National Accelerator Laboratory (JLab) using a 100 mev electron beam from an energy-recovery linear accelerator. The beam was directed successively through 6 mm, 4 mm, and 2 mm diameter apertures of length 127 mm in aluminum at a maximum current of 4.3 mA (430 kW beam power). This study was conducted to characterize radiation levels for experiments that need to operate in this environment, such as the proposed DarkLight Experiment. We find that sustained transmission of a 430 kW continuous-wave (CW) beam through a 2 mm aperture is feasible with manageable beam-related backgrounds. We also find that during beam-off, RF-on operation, multipactoring inside the niobium cavities of the accelerator cryomodules is the primary source of ambient radiation when the machine is tuned for 130 mev operation., United States. Dept. of Energy. Office of Science
- Published
- 2016
8. Transmission of Megawatt Relativistic Electron Beams through Millimeter Apertures
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Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Bertozzi, William, Cowan, Ray Franklin, Fisher, Peter H., Ihloff, Ernest E., Kelleher, A., Milner, Richard G., Ou, Longwu, Schmookler, Barak Abraham, Tschalaer, Christoph, Alarcon, R., Balascuta, S., Benson, S. V., Boyce, J. R., Douglas, D., Evtushenko, P., Kalantarians, N., Legg, R., Neil, G. R., Tennant, C., Williams, G. P., Zhang, S., Cowan, Ray F, Fisher, Peter H, Ihloff, Ernest E, Milner, Richard G, Tschalar, Christoph, Kelleher, Aidan, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Bertozzi, William, Cowan, Ray Franklin, Fisher, Peter H., Ihloff, Ernest E., Kelleher, A., Milner, Richard G., Ou, Longwu, Schmookler, Barak Abraham, Tschalaer, Christoph, Alarcon, R., Balascuta, S., Benson, S. V., Boyce, J. R., Douglas, D., Evtushenko, P., Kalantarians, N., Legg, R., Neil, G. R., Tennant, C., Williams, G. P., Zhang, S., Cowan, Ray F, Fisher, Peter H, Ihloff, Ernest E, Milner, Richard G, Tschalar, Christoph, and Kelleher, Aidan
- Abstract
High-power, relativistic electron beams from energy-recovering linacs have great potential to realize new experimental paradigms for pioneering innovation in fundamental and applied research. A major design consideration for this new generation of experimental capabilities is the understanding of the halo associated with these bright, intense beams. In this Letter, we report on measurements performed using the 100 MeV, 430 kW cw electron beam from the energy-recovering linac at the Jefferson Laboratory’s Free Electron Laser facility as it traversed a set of small apertures in a 127 mm long aluminum block. Thermal measurements of the block together with neutron measurements near the beam-target interaction point yielded a consistent understanding of the beam losses. These were determined to be 3 ppm through a 2 mm diameter aperture and were maintained during a 7 h continuous run., United States. Dept. of Energy. Office of High Energy and Nuclear Physics
- Published
- 2014
9. Hard Two-Photon Contribution to Elastic Lepton-Proton Scattering Determined by the OLYMPUS Experiment
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Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Henderson, Brian Scott, O'Connor, Colton David, Russell, Rebecca Lynn, Bernauer, Jan Christopher, Bessuille, Jason C., Donnelly, T William, Dow, Karen Ann, Hasell, Douglas K, Ihloff, Ernest E, Kelsey, James E, Milner, Richard G, Redwine, Robert P, Vidal, Christopher J, Winnebeck, Alexander, Schmidt, Axel William, Ice, L. D., Khaneft, D., Schmidt, A., Kohl, M., Akopov, N., Alarcon, R., Ates, O., Avetisyan, A., Beck, R., Belostotski, S., Brinker, F., Calarco, J. R., Carassiti, V., Cisbani, E., Ciullo, G., Contalbrigo, M., De Leo, R., Diefenbach, J., Elbakian, G., Eversheim, P. D., Frullani, S., Funke, Ch., Gavrilov, G., Gläser, B., Görrissen, N., Hauschildt, J., Hoffmeister, Ph., Holler, Y., Izotov, A., Kaiser, R., Karyan, G., Kiselev, A., Klassen, P., Krivshich, A., Lehmann, I., Lenisa, P., Lenz, D., Lumsden, S., Ma, Y., Maas, F., Marukyan, H., Miklukho, O., Milner, R. G., Movsisyan, A., Murray, M., Naryshkin, Y., Perez Benito, R., Perrino, R., Rodríguez Piñeiro, D., Rosner, G., Schneekloth, U., Seitz, B., Statera, M., Thiel, A., Vardanyan, H., Veretennikov, D., Yeganov, V., Hasell, Douglas K., Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Henderson, Brian Scott, O'Connor, Colton David, Russell, Rebecca Lynn, Bernauer, Jan Christopher, Bessuille, Jason C., Donnelly, T William, Dow, Karen Ann, Hasell, Douglas K, Ihloff, Ernest E, Kelsey, James E, Milner, Richard G, Redwine, Robert P, Vidal, Christopher J, Winnebeck, Alexander, Schmidt, Axel William, Ice, L. D., Khaneft, D., Schmidt, A., Kohl, M., Akopov, N., Alarcon, R., Ates, O., Avetisyan, A., Beck, R., Belostotski, S., Brinker, F., Calarco, J. R., Carassiti, V., Cisbani, E., Ciullo, G., Contalbrigo, M., De Leo, R., Diefenbach, J., Elbakian, G., Eversheim, P. D., Frullani, S., Funke, Ch., Gavrilov, G., Gläser, B., Görrissen, N., Hauschildt, J., Hoffmeister, Ph., Holler, Y., Izotov, A., Kaiser, R., Karyan, G., Kiselev, A., Klassen, P., Krivshich, A., Lehmann, I., Lenisa, P., Lenz, D., Lumsden, S., Ma, Y., Maas, F., Marukyan, H., Miklukho, O., Milner, R. G., Movsisyan, A., Murray, M., Naryshkin, Y., Perez Benito, R., Perrino, R., Rodríguez Piñeiro, D., Rosner, G., Schneekloth, U., Seitz, B., Statera, M., Thiel, A., Vardanyan, H., Veretennikov, D., Yeganov, V., and Hasell, Douglas K.
- Abstract
Deutsche Forschungsgemeinschaft, Armenia (Republic). Ministry of Education and Science, Science and Technology Facilities Council (Great Britain), Scottish Universities Physics Alliance, United States. Dept. of Energy, National Science Foundation (U.S.), Ministry of Education and Science of the Russian Federation, Alexander von Humboldt Foundation
- Published
- 2017
10. The OLYMPUS internal hydrogen target
- Author
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Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Bernauer, Jan Christopher, Henderson, Brian Scott, Ihloff, Ernest E, Kelsey, James E, Milner, Richard G, Schmidt, Axel William, Carassiti, V., Ciullo, G., Lenisa, P., Statera, M., Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Bernauer, Jan Christopher, Henderson, Brian Scott, Ihloff, Ernest E, Kelsey, James E, Milner, Richard G, Schmidt, Axel William, Carassiti, V., Ciullo, G., Lenisa, P., and Statera, M.
- Abstract
An internal hydrogen target system was developed for the OLYMPUS experiment at DESY, in Hamburg, Germany. The target consisted of a long, thin-walled, tubular cell within an aluminum scattering chamber. Hydrogen entered at the center of the cell and exited through the ends, where it was removed from the beamline by a multistage pumping system. A cryogenic coldhead cooled the target cell to counteract heating from the beam and increase the density of hydrogen in the target. A fixed collimator protected the cell from synchrotron radiation and the beam halo. A series of wakefield suppressors reduced heating from beam wakefields. The target system was installed within the DORIS storage ring and was successfully operated during the course of the OLYMPUS experiment in 2012. Information on the design, fabrication, and performance of the target system is reported., United States. Dept. of Energy. Office of Nuclear Energy
- Published
- 2017
11. Compact x-ray source based on burst-mode inverse Compton scattering at 100 kHz
- Author
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Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Research Laboratory of Electronics, MIT Nuclear Reactor Laboratory, Graves, William S., Hong, Kyung-Han, Ihloff, Ernest E., Khaykovich, Boris, Bessuille, J., Brown, P., Lin, H., Nanni, Emilio Alessandro, Resta, G., Zapata, L. E., Kaertner, Franz X., Moncton, David E., Carbajo, S., Dolgashev, Valery A., Murari, K., Tantawi, S., Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Research Laboratory of Electronics, MIT Nuclear Reactor Laboratory, Graves, William S., Hong, Kyung-Han, Ihloff, Ernest E., Khaykovich, Boris, Bessuille, J., Brown, P., Lin, H., Nanni, Emilio Alessandro, Resta, G., Zapata, L. E., Kaertner, Franz X., Moncton, David E., Carbajo, S., Dolgashev, Valery A., Murari, K., and Tantawi, S.
- Abstract
A design for a compact x-ray light source (CXLS) with flux and brilliance orders of magnitude beyond existing laboratory scale sources is presented. The source is based on inverse Compton scattering of a high brightness electron bunch on a picosecond laser pulse. The accelerator is a novel high-efficiency standing-wave linac and rf photoinjector powered by a single ultrastable rf transmitter at X-band rf frequency. The high efficiency permits operation at repetition rates up to 1 kHz, which is further boosted to 100 kHz by operating with trains of 100 bunches of 100 pC charge, each separated by 5 ns. The entire accelerator is approximately 1 meter long and produces hard x rays tunable over a wide range of photon energies. The colliding laser is a Yb∶YAG solid-state amplifier producing 1030 nm, 100 mJ pulses at the same 1 kHz repetition rate as the accelerator. The laser pulse is frequency-doubled and stored for many passes in a ringdown cavity to match the linac pulse structure. At a photon energy of 12.4 keV, the predicted x-ray flux is 5×10[superscript 11] photons/second in a 5% bandwidth and the brilliance is 2 × 10[superscript 12] photons/(sec mm[superscript 2] mrad[superscript 2] 0.1%) in pulses with rms pulse length of 490 fs. The nominal electron beam parameters are 18 MeV kinetic energy, 10 microamp average current, 0.5 microsecond macropulse length, resulting in average electron beam power of 180 W. Optimization of the x-ray output is presented along with design of the accelerator, laser, and x-ray optic components that are specific to the particular characteristics of the Compton scattered x-ray pulses., United States. Defense Advanced Research Projects Agency (Grant N66001-11-1-4192), National Science Foundation (U.S.) (Grant DMR-1042342), United States. Dept. of Energy (Grant DE-FG02-10ER46745), United States. Dept. of Energy (Grant DE-FG02-08ER41532), Center for Free-Electron Laser Science
- Published
- 2014
12. The OLYMPUS internal hydrogen target
- Author
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Brian S. Henderson, J. Kelsey, Ross Milner, M. Statera, P. Lenisa, Axel Schmidt, V. Carassiti, E. Ihloff, Jan C. Bernauer, G. Ciullo, Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Bernauer, Jan Christopher, Henderson, Brian Scott, Ihloff, Ernest E, Kelsey, James E, Milner, Richard G, and Schmidt, Axel William
- Subjects
Nuclear and High Energy Physics ,Physics - Instrumentation and Detectors ,Fabrication ,Hydrogen ,FOS: Physical sciences ,Synchrotron radiation ,chemistry.chemical_element ,Internal hydrogen target ,OLYMPUS ,Vacuum system ,Wakefield suppression ,NO ,law.invention ,Optics ,law ,ddc:530 ,Nuclear Experiment (nucl-ex) ,Nuclear Experiment ,Instrumentation ,Physics ,business.industry ,DESY ,Collimator ,Instrumentation and Detectors (physics.ins-det) ,Beamline ,chemistry ,business ,Beam (structure) ,Storage ring - Abstract
An internal hydrogen target system was developed for the OLYMPUS experiment at DESY, in Hamburg, Germany. The target consisted of a long, thin-walled, tubular cell within an aluminum scattering chamber. Hydrogen entered at the center of the cell and exited through the ends, where it was removed from the beamline by a multistage pumping system. A cryogenic coldhead cooled the target cell to counteract heating from the beam and increase the density of hydrogen in the target. A fixed collimator protected the cell from synchrotron radiation and the beam halo. A series of wakefield suppressors reduced heating from beam wakefields. The target system was installed within the DORIS storage ring and was successfully operated during the course of the OLYMPUS experiment in 2012. Information on the design, fabrication, and performance of the target system is reported., 9 pages, 13 figures
- Published
- 2014
- Full Text
- View/download PDF
13. Precision Electron-Beam Polarimetry at 1 GeV Using Diamond Microstrip Detectors
- Author
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P. M. King, G. D. Cates, Dipangkar Dutta, M. M. Dalton, W. D. Ramsay, M. McDonald, B. S. Cavness, A. Tobias, S. Kowalski, L. Lee, Wouter Deconinck, H. Mkrtchyan, B. Waidyawansa, J. C. Cornejo, Vladimir Nelyubin, S. A. Page, Kent Paschke, R. W. L. Jones, S. Zhamkotchyan, Jonathan W. Martin, Douglas Storey, P. Solvignon, G. Hays, Amber McCreary, Jay Benesch, P. Wang, L. A. Dillon-Townes, A. Asaturyan, E. Ihloff, V. Tvaskis, A. Mkrtchyan, Erik Urban, D. C. Jones, C. Vidal, A. Micherdzinska, Leonid Kurchaninov, Amrendra Narayan, D. Gaskell, Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Ihloff, Ernest E., Kowalski, Stanley B., and Vidal, Christopher J.
- Subjects
Physics ,010308 nuclear & particles physics ,business.industry ,Scattering ,QC1-999 ,Compton scattering ,Polarimetry ,General Physics and Astronomy ,Diamond ,Electron ,engineering.material ,01 natural sciences ,Particle detector ,Optics ,Deflection (physics) ,0103 physical sciences ,Cathode ray ,engineering ,Physics::Accelerator Physics ,010306 general physics ,business - Abstract
We report on the highest precision yet achieved in the measurement of the polarization of a low-energy, O(1 GeV), continuous-wave (CW) electron beam, accomplished using a new polarimeter based on electron-photon scattering, in Hall C at Jefferson Lab. A number of technical innovations were necessary, including a novel method for precise control of the laser polarization in a cavity and a novel diamond microstrip detector that was able to capture most of the spectrum of scattered electrons. The data analysis technique exploited track finding, the high granularity of the detector, and its large acceptance. The polarization of the 180-μA, 1.16-GeV electron beam was measured with a statistical precision of, United States. Dept. of Energy (Contract AC05-06OR23177), National Science Foundation (U.S.), Natural Sciences and Engineering Research Council of Canada
- Published
- 2015
14. Compact x-ray source based on burst-mode inverse Compton scattering at 100 kHz
- Author
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Sergio Carbajo, Krishna Murari, Boris Khaykovich, Sami Tantawi, Hua Lin, David E. Moncton, J. Bessuille, E. Ihloff, William Graves, Valery Dolgashev, Franz X. Kärtner, P. Brown, Kyung-Han Hong, Luis E. Zapata, G. Resta, Emilio A. Nanni, Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Research Laboratory of Electronics, MIT Nuclear Reactor Laboratory, Graves, William S., Hong, Kyung-Han, Ihloff, Ernest E., Khaykovich, Boris, Bessuille, J., Brown, P., Lin, H., Nanni, Emilio Alessandro, Resta, G., Zapata, L. E., Kaertner, Franz X., and Moncton, David E.
- Subjects
Accelerator Physics (physics.acc-ph) ,Nuclear and High Energy Physics ,Photon ,Physics and Astronomy (miscellaneous) ,FOS: Physical sciences ,Inverse ,Electron ,Photon energy ,7. Clean energy ,01 natural sciences ,Linear particle accelerator ,law.invention ,010309 optics ,Optics ,law ,0103 physical sciences ,lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ,ddc:530 ,Physics ,010308 nuclear & particles physics ,business.industry ,Compton scattering ,Particle accelerator ,Surfaces and Interfaces ,Laser ,lcsh:QC770-798 ,Physics::Accelerator Physics ,Physics - Accelerator Physics ,Atomic physics ,business - Abstract
A design for a compact x-ray light source (CXLS) with flux and brilliance orders of magnitude beyond existing laboratory scale sources is presented. The source is based on inverse Compton scattering of a high brightness electron bunch on a picosecond laser pulse. The accelerator is a novel high-efficiency standing-wave linac and rf photoinjector powered by a single ultrastable rf transmitter at X-band rf frequency. The high efficiency permits operation at repetition rates up to 1 kHz, which is further boosted to 100 kHz by operating with trains of 100 bunches of 100 pC charge, each separated by 5 ns. The entire accelerator is approximately 1 meter long and produces hard x rays tunable over a wide range of photon energies. The colliding laser is a Yb∶YAG solid-state amplifier producing 1030 nm, 100 mJ pulses at the same 1 kHz repetition rate as the accelerator. The laser pulse is frequency-doubled and stored for many passes in a ringdown cavity to match the linac pulse structure. At a photon energy of 12.4 keV, the predicted x-ray flux is 5×10[superscript 11] photons/second in a 5% bandwidth and the brilliance is 2 × 10[superscript 12] photons/(sec mm[superscript 2] mrad[superscript 2] 0.1%) in pulses with rms pulse length of 490 fs. The nominal electron beam parameters are 18 MeV kinetic energy, 10 microamp average current, 0.5 microsecond macropulse length, resulting in average electron beam power of 180 W. Optimization of the x-ray output is presented along with design of the accelerator, laser, and x-ray optic components that are specific to the particular characteristics of the Compton scattered x-ray pulses., United States. Defense Advanced Research Projects Agency (Grant N66001-11-1-4192), National Science Foundation (U.S.) (Grant DMR-1042342), United States. Dept. of Energy (Grant DE-FG02-10ER46745), United States. Dept. of Energy (Grant DE-FG02-08ER41532), Center for Free-Electron Laser Science
- Published
- 2014
- Full Text
- View/download PDF
15. Transmission of High-Power Electron Beams Through Small Apertures
- Author
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L. Ou, William Bertozzi, R. Cowan, Pavel Evtushenko, A. Kelleher, S. Balascuta, C. Tschalär, George R. Neil, Ricardo Alarcon, Ross Milner, Robert Legg, Chris Tennant, E. Ihloff, N. Kalantarians, P. H. Fisher, James Boyce, Shukui Zhang, B. Schmookler, David Douglas, Gustavious P. Williams, S.V. Benson, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Tschalar, Christoph, Bertozzi, William, Cowan, Ray Franklin, Fisher, Peter H., Ihloff, Ernest E., Kelleher, Aidan, Milner, Richard G., Ou, Longwu, and Schmookler, Barak Abraham
- Subjects
Accelerator Physics (physics.acc-ph) ,Physics ,Nuclear and High Energy Physics ,Beam diameter ,business.industry ,Aperture ,FOS: Physical sciences ,Electron ,Linear particle accelerator ,Optics ,Transmission (telecommunications) ,Cathode ray ,Physics - Accelerator Physics ,Laser beam quality ,business ,Instrumentation ,Beam divergence - Abstract
Tests were performed to pass a 100 MeV, 430 kWatt c.w. electron beam from the energy-recovery linac at the Jefferson Laboratory's FEL facility through a set of small apertures in a 127 mm long aluminum block. Beam transmission losses of 3 p.p.m. through a 2 mm diameter aperture were maintained during a 7 h continuous run., United States. Dept. of Energy (Contract DE-AC05-060R23177), United States. Dept. of Energy (MIT Nuclear Contract DE-FG02-94ER40818), Commonwealth of Virginia
- Published
- 2013
16. Measured Radiation and Background Levels During Transmission of Megawatt Electron Beams Through Millimeter Apertures
- Author
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George R. Neil, L. Ou, E. Ihloff, Shukui Zhang, R. Cowan, Gustavious P. Williams, Pavel Evtushenko, W. J. Kossler, C. Tschalär, James Boyce, William Bertozzi, P. H. Fisher, N. Kalantarians, S. Balascuta, B. Schmookler, S.V. Benson, E. Long, A. Kelleher, Ricardo Alarcon, Ross Milner, Chris Tennant, Robert Legg, David Douglas, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Bertozzi, William, Cowan, Ray Franklin, Fisher, Peter H., Ihloff, Ernest E., Kelleher, Aidan, Milner, Richard G., Ou, Longwu, Schmookler, Barak Abraham, and Tschalar, Christoph
- Subjects
Accelerator Physics (physics.acc-ph) ,Physics ,Nuclear and High Energy Physics ,Photon ,Aperture ,business.industry ,FOS: Physical sciences ,Radiation ,Neutron radiation ,Laser ,Linear particle accelerator ,law.invention ,Optics ,law ,Cathode ray ,Physics::Accelerator Physics ,Physics - Accelerator Physics ,business ,Instrumentation ,Beam (structure) - Abstract
We report measurements of photon and neutron radiation levels observed while transmitting a 0.43 MW electron beam through millimeter-sized apertures and during beam-off, but accelerating gradient RF-on, operation. These measurements were conducted at the Free-Electron Laser (FEL) facility of the Jefferson National Accelerator Laboratory (JLab) using a 100 MeV electron beam from an energy-recovery linear accelerator. The beam was directed successively through 6 mm, 4 mm, and 2 mm diameter apertures of length 127 mm in aluminum at a maximum current of 4.3 mA (430 kW beam power). This study was conducted to characterize radiation levels for experiments that need to operate in this environment, such as the proposed DarkLight Experiment. We find that sustained transmission of a 430 kW continuous-wave (CW) beam through a 2 mm aperture is feasible with manageable beam-related backgrounds. We also find that during beam-off, RF-on operation, multipactoring inside the niobium cavities of the accelerator cryomodules is the primary source of ambient radiation when the machine is tuned for 130 MeV operation., 9 pages, 11 figures, submitted to Nuclear Instruments and Methods in Physics Research Section A
- Published
- 2013
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