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9 results on '"van der Werf, D. P."'

1. AD-7/GBAR status report for the 2015 CERN SPSC

Author

Banerjee, D, Biraben, F, Brook-Roberge, D, Charlton, M, Cladé, P, Comini, P, Crivelli, P, Dalkarov, O, Debu, P, Douillet, A, Dufour, G, Dupré, P, Eriksson, S, Froelich, P, Grandemange, P, Guellati, S, Guérout, R, Heinrich, J-M, Hervieux, P-A, Hilico, L, Husson, A, Indelicato, P, Jonsell, S, Karr, J-P, Khabarova, K, Kolachevsky, N, Kuroda, N, Lambrecht, A, Leite, A M M, Liszkay, L, Lotrus, P, Lunney, D, Madsen, N, Manfredi, G, Mansoulié, B, Matsuda, Y, Mohri, A, Mortensen, T, Nagashima, Y, Nesvizhevsky, V, Nez, F, Pérez, P, Regenfus, C, Rey, J-M, Reymond, J-M, Roussé, J-Y, Reynaud, S, Rubbia, A, Sacquin, Y, Schmidt-Kaler, F, Sillitoe, N, Staszczak, M, Szabo-Foster, C I, Torii, H, Vallage, B, Valdes, M, van der Werf, D P, Voronin, A, Walz, J, Wolf, S, Wronka, S, and Yamazaki, Y

Subjects
Physics::Accelerator Physics, Physics::Atomic Physics, Detectors and Experimental Techniques
Abstract

The GBAR experiment will use one of the low energy antiproton beam lines from the ELENA ring that is being prepared and scheduled to start operating in 2017. The apparatus is broadly divided into four sections: antiproton deceleration and focussing, positron production and accumulation, antihydrogen cooling and preparation, and detection. In the following, we give updates on the different parts and the status of preparation for installation in the AD hall, referring to the previous report that was submitted in April of 2014

Published
2015

2. AD-7/GBAR status report for the 2014 CERN SPSC

Author

Dupré, P, Grandemange, P, Lunney, D, Manea, V, Badertscher, A, Banerjee, D, Crivelli, P, Curioni, A, Marchionni, A, Rossi, B, Rubbia, A, Nesvizhevsky, V, Hervieux, P-A, Manfredi, G, Brook-Roberge, D, Comini, P, Debu, P, Liszkay, L, Mansoulié, B, Mortensen, T, Pérez, P, Rey, J-M, Reymond, J-M, Sacquin, Y, Vallage, B, Dalkarov, O, Kolachevskiy, N, Khabarova, K, Voronin, A, Biraben, F, Cladé, P, Douillet, A, Dufour, G, Guellati, S, Hilico, L, Indelicato, P, Lambrecht, A, Karr, J-P, Nez, F, Reynaud, S, Tran, V-Q, Schmidt-Kaler, F, Wolf, S, Walz, J, Staszczak, M, Wronka, S, Mohri, A, Yamazaki, Y, Charlton, M, Eriksson, S, Madsen, N, van der Werf, D P, Kuroda, N, Matsuda, Y, Torii, H, Nagashima, Y, Froelich, P, and Jonsell, S

Subjects
Physics::Accelerator Physics, High Energy Physics::Experiment, Detectors and Experimental Techniques, Nuclear Experiment
Abstract

A status report is given on the preparations and tests in view of the AD-7 / GBAR experiment at the future ELENA facility to be constructed at the CERN Antiproton Decelerator.

Published
2014

3. Antihydrogen and mirror-trapped antiproton discrimination: Discriminating between antihydrogen and mirror-trapped antiprotons in a minimum-B trap

Author

Amole, C., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayden, M. E., Humphries, A. J., Hydomako, R., Kurchaninov, L., Jonsell, S., Madsen, N., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., van der Werf, D. P., and Wurtele, J. S.

Subjects
Condensed Matter::Quantum Gases, Plasma Physics (physics.plasm-ph), Physics::General Physics, High Energy Physics - Experiment (hep-ex), Atomic Physics (physics.atom-ph), Physics::Accelerator Physics, FOS: Physical sciences, Physics::Atomic Physics, Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics - Plasma Physics, Physics - Atomic Physics, High Energy Physics - Experiment
Abstract

Recently, antihydrogen atoms were trapped at CERN in a magnetic minimum (minimum-B) trap formed by superconducting octupole and mirror magnet coils. The trapped antiatoms were detected by rapidly turning off these magnets, thereby eliminating the magnetic minimum and releasing any antiatoms contained in the trap. Once released, these antiatoms quickly hit the trap wall, whereupon the positrons and antiprotons in the antiatoms annihilated. The antiproton annihilations produce easily detected signals; we used these signals to prove that we trapped antihydrogen. However, our technique could be confounded by mirror-trapped antiprotons, which would produce seemingly-identical annihilation signals upon hitting the trap wall. In this paper, we discuss possible sources of mirror-trapped antiprotons and show that antihydrogen and antiprotons can be readily distinguished, often with the aid of applied electric fields, by analyzing the annihilation locations and times. We further discuss the general properties of antiproton and antihydrogen trajectories in this magnetic geometry, and reconstruct the antihydrogen energy distribution from the measured annihilation time history., Comment: 17 figures

Published
2012
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4. ALPHA ANTIHYDROGEN EXPERIMENT

Author

ALPHA Collaboration, Fujiwara, M. C., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bray, C. C., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Friesen, T., Gill, D. R., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jonsell, S., Kurchaninov, L., Lambo, R., Madsen, N., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wilding, D., Wurtele, J. S., and Yamazaki, Y.

Subjects
Condensed Matter::Quantum Gases, Physics, Physics::General Physics, Atomic Physics (physics.atom-ph), FOS: Physical sciences, Alpha (ethology), Physics - Plasma Physics, High Energy Physics - Experiment, Physics - Atomic Physics, 3. Good health, Plasma Physics (physics.plasm-ph), Nuclear physics, High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Physics::Atomic and Molecular Clusters, Nuclear Physics - Experiment, Physics::Atomic Physics, Nuclear Experiment (nucl-ex), Antihydrogen, Nuclear Experiment
Abstract

ALPHA is an experiment at CERN, whose ultimate goal is to perform a precise test of CPT symmetry with trapped antihydrogen atoms. After reviewing the motivations, we discuss our recent progress toward the initial goal of stable trapping of antihydrogen, with some emphasis on particle detection techniques., Comment: Invited talk presented at the Fifth Meeting on CPT and Lorentz Symmetry, Bloomington, Indiana, June 28-July 2, 2010

Published
2010
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5. Evaporative cooling of antiprotons to cryogenic temperatures

Author

ALPHA Collaboration, Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A., Hydomako, R., Jonsell, S., Kurchaninov, L., Lambo, R., Madsen, N., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wilding, D., Wurtele, J. S., and Yamazaki, Y.

Subjects
Accelerator Physics (physics.acc-ph), Atomic Physics (physics.atom-ph), Other Fields of Physics, Evaporation, FOS: Physical sciences, General Physics and Astronomy, Cryogenics, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Physics - Atomic Physics, 010305 fluids & plasmas, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Physics::Atomic Physics, Nuclear Experiment (nucl-ex), 010306 general physics, Antihydrogen, Nuclear Experiment, Physics, Plasma, Physics - Plasma Physics, Charged particle, Plasma Physics (physics.plasm-ph), Antiproton, Antimatter, Physics - Accelerator Physics, Evaporative cooler
Abstract

We report the application of evaporative cooling to clouds of trapped antiprotons, resulting in plasmas with measured temperature as low as 9~K. We have modeled the evaporation process for charged particles using appropriate rate equations. Good agreement between experiment and theory is observed, permitting prediction of cooling efficiency in future experiments. The technique opens up new possibilities for cooling of trapped ions and is of particular interest in antiproton physics, where a precise \emph{CPT} test on trapped antihydrogen is a long-standing goal., Comment: 5 pages, 4 figures

Published
2010
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6. Results from ATHENA

Author

Rotondi, Alberto, Amoretti, A, Amsler, C, Bonomi, G, Bowe, P D, Canali, C, Carraro, C, Cesar, C L, Charlton, M, Doser, Michael, Fontana, A, Fujiwara,M C, Funakoshi, R, Genova, P, Hangst, J S, Hayano, R S, Jørgensen, L V, Kellerbauer, A G, Lagomarsino, V, Landua, Rolf, Lodi Rizzini, E, Macri, M, Madsen, N, Manuzio, G, Mitchard, D, Montagna, P, Posada, L G, Pruys, H, Regenfus, C, Rotondi, A, Testera, G, Van der Werf, D P, Variola, A, Venturelli, L, Yamazaky, Y, and Zurlo, N

Subjects
Physics, Particle physics, Large Hadron Collider, Plasma, Nuclear physics, Positron, Physics::Plasma Physics, Antiproton, Physics::Atomic and Molecular Clusters, Physics::Accelerator Physics, High Energy Physics::Experiment, Physics::Atomic Physics, Detectors and Experimental Techniques, Antihydrogen
Abstract

The ATHENA experiment at CERN produced for the first time in 2002 cold antihydrogen atoms by mixing of antiprotons and a positron plasma. The more relevant results obtained in the last three years are presented and discussed in the light of the antihydrogen formation processes.

Published
2005

7. Production of Cold Antihydrogen with ATHENA for Fundamental Studies

Author

ATHENA Collaboration, Kellerbauer, A., Amoretti, M., Amsler, C., Bonomi, G., Bowe, P. D., Canali, C., Carraro, C., Cesar, C. L., Charlton, M., Doser, M., Fontana, A., Fujiwara, M. C., Funakoshi, R., Genova, P., Hangst, J. S., Hayano, R. S., Johnson, I., Jørgensen, L. V., Lagomarsino, V., Landua, R., Rizzini, E. Lodi, Macrí, M., Madsen, N., Manuzio, G., Mitchard, D., Montagna, P., Pruys, H., Regenfus, C., Rotondi, A., Testera, G., Variola, A., Venturelli, L., van der Werf, D. P., Yamazaki, Y., and Zurlo, N.

Subjects
High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics - Experiment
Abstract

Since the beginning of operations of the CERN Antiproton Decelerator in July 2000, the successful deceleration, storage and manipulation of antiprotons has led to remarkable progress in the production of antimatter. The ATHENA Collaboration were the first to create and detect cold antihydrogen in 2002, and we can today produce large enough amounts of antiatoms to study their properties as well as the parameters that govern their production rate., Comment: Proceedings of the XXXIXth Rencontres de Moriond, 2004, Electroweak Interactions and Unified Theories, Ed. J. Tran Thanh Van. 8 pages, 7 figures, 1 table

Published
2004
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8. ATHENA -- First Production of Cold Antihydrogen and Beyond

Author

ATHENA Collaboration, Kellerbauer, A., Amoretti, M., Amsler, C., Bonomi, G., Bowe, P. D., Canali, C., Carraro, C., Cesar, C. L., Charlton, M., Doser, M., Fontana, A., Fujiwara, M. C., Funakoshi, R., Genova, P., Hangst, J. S., Hayano, R. S., Johnson, I., Jørgensen, L. V., Lagomarsino, V., Landua, R., Rizzini, E. Lodi, Macrí, M., Madsen, N., Manuzio, G., Mitchard, D., Montagna, P., Pruys, H., Regenfus, C., Rotondi, A., Testera, G., Variola, A., Venturelli, L., van der Werf, D. P., Yamazaki, Y., and Zurlo, N.

Subjects
High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics - Experiment
Abstract

Atomic systems of antiparticles are the laboratories of choice for tests of CPT symmetry with antimatter. The ATHENA experiment was the first to report the production of copious amounts of cold antihydrogen in 2002. This article reviews some of the insights that have since been gained concerning the antihydrogen production process as well as the external and internal properties of the produced anti-atoms. Furthermore, the implications of those results on future prospects of symmetry tests with antimatter are discussed., Comment: Proc. of the Third Meeting on CPT and Lorentz Symmetry, Bloomington (Indiana), USA, August 2004, edited by V. A. Kostelecky (World Scientific, Singapore). 10 pages, 5 figures, 1 table. Author affiliations corr

Published
2004
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9. Detection of antihydrogen annihilations with a cryogenic pure-CsI crystal detector

Author

Regenfus, C., Amsler, C., Glauser, A., Grögler, D., Lindelöf, D., Pruys, H., Amoretti, M., Bonomi, Germano, Bouchta, A., Bowe, P., Carraro, C., Charlton, M., Doser, M., Filippini, V., Fontana, A., Fujiwara, M. C., Funakoshi, R., Genova, P., Hangst, J. S., Hayano, R. S., Holzscheiter, M. H., Jørgensen, L., Lagomarsino, V., Landua, R., Cesar, C. L., LODI RIZZINI, Evandro, Macri, M., Madsen, N., Manuzio, G., Montagna, P., Rotondi, A., Rouleau, G., Testera, G., Van der Werf, D. P., Variola, A., and Yamazaki, Y.

Subjects
Very-large-scale integration, Physics, Nuclear and High Energy Physics, Photon, Annihilation, Physics::Instrumentation and Detectors, business.industry, Cat's-whisker detector, Liquid nitrogen, Nuclear physics, Computer Science::Hardware Architecture, Optics, CMOS, Antiproton, Antihydrogen, business, Instrumentation
Abstract

In the framework of the ATHENA experiment a combined tracking and photon detector, operating close to liquid nitrogen temperatures, was developed to determine simultaneously the vertex of an antiproton annihilation and energy and direction of photons stemming from a positron annihilation. The photon detector consists of 192 pure-CsI scintillation crystals (≈4 cm 3 ) coupled to 5×5 mm 2 avalanche photo-diodes, which are read by electronic chips realised in VLSI CMOS technology. These read out chips are also operational at liquid nitrogen temperature and feature a self-triggering capability.

Published
2003

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