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23 results on '"Bray, C. C."'

1. 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
Nuclear Experiment, High Energy Physics - Experiment, High Energy Physics - Phenomenology, Physics - Atomic Physics, Physics - Plasma Physics
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
2011

2. A novel antiproton radial diagnostic based on octupole induced ballistic loss

Author

Andresen, G. B., Bertsche, W., Bowe, P. D., Bray, C. C., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M. C., Funakoshi, R., Gill, D. R., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jenkins, M. J., Jorgensen, L. V., Kurchaninov, L., Lambo, R., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Page, R. D., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Nasr, S. Seif El, Silveira, D. M., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

Subjects
Physics - Atomic Physics, Nuclear Experiment
Abstract

We report results from a novel diagnostic that probes the outer radial profile of trapped antiproton clouds. The diagnostic allows us to determine the profile by monitoring the time-history of antiproton losses that occur as an octupole field in the antiproton confinement region is increased. We show several examples of how this diagnostic helps us to understand the radial dynamics of antiprotons in normal and nested Penning-Malmberg traps. Better understanding of these dynamics may aid current attempts to trap antihydrogen atoms.

Published
2008
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3. Compression of Antiproton Clouds for Antihydrogen Trapping

Author

Andresen, G. B., Bertsche, W., Bowe, P. D., Bray, C. C., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M. C., Funakoshi, R., Gill, D. R., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Hydomako, R., Jenkins, M. J., Jorgensen, L. V., Kurchaninov, L., Lambo, R., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Nasr, S. Seif El, Silveira, D. M., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

Subjects
Nuclear Experiment
Abstract

Control of the radial profile of trapped antiproton clouds is critical to trapping antihydrogen. We report the first detailed measurements of the radial manipulation of antiproton clouds, including areal density compressions by factors as large as ten, by manipulating spatially overlapped electron plasmas. We show detailed measurements of the near-axis antiproton radial profile and its relation to that of the electron plasma.

Published
2008
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4. Particle Physics Aspects of Antihydrogen Studies with ALPHA at CERN

Author

ALPHA Collaboration, Fujiwara, M. C., Andresen, G. B., Bertsche, W., Bowe, P. D., Bray, C. C., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Funakoshi, R., Gill, D. R., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jenkins, M. J., Jorgensen, L. V., Kurchaninov, L., Lai, W., Lambo, R., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Nasr, S. Seif El, Silveira, D. M., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wasilenko, L., Wurtele, J. S., and Yamazaki, Y.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology, Nuclear Experiment, Physics - Atomic Physics
Abstract

We discuss aspects of antihydrogen studies, that relate to particle physics ideas and techniques, within the context of the ALPHA experiment at CERN's Antiproton Decelerator facility. We review the fundamental physics motivations for antihydrogen studies, and their potential physics reach. We argue that initial spectroscopy measurements, once antihydrogen is trapped, could provide competitive tests of CPT, possibly probing physics at the Planck Scale. We discuss some of the particle detection techniques used in ALPHA. Preliminary results from commissioning studies of a partial system of the ALPHA Si vertex detector are presented, the results of which highlight the power of annihilation vertex detection capability in antihydrogen studies., Comment: Invited talk at Pbar08 - Workshop on Cold Antimatter Plasmas and Application to Fundamental Physics, Okinawa, Japan, 2008. 14 pages, 8 figures

Published
2008
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5. Towards antihydrogen trapping and spectroscopy at ALPHA

Author

Butler, E., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Bray, C. C., 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. 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., Yamazaki, Y., and ALPHA Collaboration

Published
2011
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6. 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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7. First attempts at antihydrogen trapping in ALPHA

Author

Andresen, Gorm, Bertsche, W., Bowe, Paul David, Bray, C. C., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M. C., Funakoshi, R., Gill, D. R., Hangst, Jeffrey S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jenkins, M. J., Jørgensen, L. V., Kurchaninov, L., Lambo, R., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Page, R. D., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., El Nasr, S. S., Silveira, D. M., Storey, J. W., Thompson, R. I., Werf, D. P. D., Wurtele, J. S., and Yamazaki, Y.

Published
2008

8. Antiproton compression and radial measurements

Author

Andresen, Gorm, Bertsche, W., Bowe, Paul David, Bray, C. C., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M. C., Funakoshi, R., Gill, D. R., Hangst, Jeffrey S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jenkins, M. J., Jørgensen, L. V., Kurchaninov, L., Lambo, R., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Page, R. D., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Seif El Nasr, S., Silveira, D. M., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

Published
2008

9. Search for trapped antihydrogen

Author

Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Bray, C. C., 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. J., Hydomako, R., Jonsell, Svante, Jörgensen, L. V., Kurchaninov, L., Lambo, R., Madsen, N., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Seif El Nasr, S., Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wilding, D., Wurtele, J. S., Yamazaki, Y., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Bray, C. C., 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. J., Hydomako, R., Jonsell, Svante, Jörgensen, L. V., Kurchaninov, L., Lambo, R., Madsen, N., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Seif El Nasr, S., Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wilding, D., Wurtele, J. S., and Yamazaki, Y.

Abstract

We present the results of an experiment to search for trapped antihydrogen atoms with the ALPHA antihydrogen trap at the CERN Antiproton Decelerator. Sensitive diagnostics of the temperatures, sizes, and densities of the trapped antiproton and positron plasmas have been developed, which in turn permitted development of techniques to precisely and reproducibly control the initial experimental parameters. The use of a position-sensitive annihilation vertex detector, together with the capability of controllably quenching the superconducting magnetic minimum trap, enabled us to carry out a high-sensitivity and low-background search for trapped synthesised antihydrogen atoms. We aim to identify the annihilations of antihydrogen atoms held for at least 130 ms in the trap before being released over ~30 ms. After a three-week experimental run in 2009 involving mixing of 107 antiprotons with 1.3ￜ109 positrons to produce 6ￜ105 antihydrogen atoms, we have identified six antiproton annihilation events that are consistent with the release of trapped antihydrogen. The cosmic ray background, estimated to contribute 0.14 counts, is incompatible with this observation at a significance of 5.6 sigma. Extensive simulations predict that an alternative source of annihilations, the escape of mirror-trapped antiprotons, is highly unlikely, though this possibility has not yet been ruled out experimentally.

Published
2011
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10. Antiparticle sources for antihydrogen production and trapping

Author

Charlton, M, Andresen, G B, Ashkezari, M D, Baquero-Ruiz, M, Bertsche, W, Bowe, P D, Bray, C C, Butler, E, Cesar, C L, Chapman, S, Fajans, J, Friesen, T, Fujiwara, M C, Gill, D R, Hangst, J S, Hardy, W N, Hayano, R S, Hayden, M E, Humphries, A J, Hydomako, R, Jonsell, Svante, JÞrgensen, L V, Kerrigan, S J, Kurchaninov, L, Lambo, R, Madsen, N, Menary, S, Nolan, P, Olchanski, K, Povilus, A, Pusa, P, Robicheaux, F, Sarid, E, Nasr, S Seif El, Silveira, D M, So, C, Storey, J W, Thompson, R I, Werf, D P Van Der, Wilding, D, Wurtele, J S, Yamazaki, Y, Collaboration, Alpha, Charlton, M, Andresen, G B, Ashkezari, M D, Baquero-Ruiz, M, Bertsche, W, Bowe, P D, Bray, C C, Butler, E, Cesar, C L, Chapman, S, Fajans, J, Friesen, T, Fujiwara, M C, Gill, D R, Hangst, J S, Hardy, W N, Hayano, R S, Hayden, M E, Humphries, A J, Hydomako, R, Jonsell, Svante, JÞrgensen, L V, Kerrigan, S J, Kurchaninov, L, Lambo, R, Madsen, N, Menary, S, Nolan, P, Olchanski, K, Povilus, A, Pusa, P, Robicheaux, F, Sarid, E, Nasr, S Seif El, Silveira, D M, So, C, Storey, J W, Thompson, R I, Werf, D P Van Der, Wilding, D, Wurtele, J S, Yamazaki, Y, and Collaboration, Alpha

Abstract

Sources of positrons and antiprotons that are currently used for the formation of antihydrogen with low kinetic energies are reviewed, mostly in the context of the ALPHA collaboration and its predecessor ATHENA. The experiments were undertaken at the Antiproton Decelerator facility, which is located at CERN. Operations performed on the clouds of antiparticles to facilitate their mixing to produce antihydrogen are described. These include accumulation, cooling and manipulation. The formation of antihydrogen and some of the characteristics of the anti-atoms that are created are discussed. Prospects for trapping antihydrogen in a magnetic minimum trap, as envisaged by the ALPHA collaboration, are reviewed.

Published
2011
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11. Search for trapped antihydrogen in ALPHA

Author

Madsen, N, Andresen, G B, Ashkezari, M D, Baquero-Ruiz, M, Bertsche, W, Bowe, P D, Bray, C C, 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, Hayden, M R, Humphries, A J, Hydomako, R, Jonsell, Svante, Jørgensen, L V, Kurchaninov, L, Lambo, R, Menary, S, Nolan, P, Olchanski, K, Olin, A, Povilus, A, Pusa, P, Robicheaux, F, Sarid, E, Seif El Nasr, S, Silveira, D M, So, C, Storey, J W, Thompson, R I, van der Werf, D P, Wurtele, J S, Yamazaki, Y, Madsen, N, Andresen, G B, Ashkezari, M D, Baquero-Ruiz, M, Bertsche, W, Bowe, P D, Bray, C C, 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, Hayden, M R, Humphries, A J, Hydomako, R, Jonsell, Svante, Jørgensen, L V, Kurchaninov, L, Lambo, R, Menary, S, Nolan, P, Olchanski, K, Olin, A, Povilus, A, Pusa, P, Robicheaux, F, Sarid, E, Seif El Nasr, S, Silveira, D M, So, C, Storey, J W, Thompson, R I, van der Werf, D P, Wurtele, J S, and Yamazaki, Y

Abstract

Antihydrogen spectroscopy promises precise tests of the symmetry of matter and antimatter, and can possibly offer new insights into the baryon asymmetry of the universe. Antihydrogen is, however, difficult to synthesize and is produced only in small quantities. The ALPHA collaboration is therefore pursuing a path towards trapping cold antihydrogen to permit the use of precision atomic physics tools to carry out comparisons of antihydrogen and hydrogen. ALPHA has addressed these challenges. Control of the plasma sizes has helped to lower the influence of the multipole field used in the neutral atom trap, and thus lowered the temperature of the created atoms. Finally, the first systematic attempt to identify trapped antihydrogen in our system is discussed. This discussion includes special techniques for fast release of the trapped anti-atoms, as well as a silicon vertex detector to identify antiproton annihilations. The silicon detector reduces the background of annihilations, including background from antiprotons that can be mirror trapped in the fields of the neutral atom trap. A description of how to differentiate between these events and those resulting from trapped antihydrogen atoms is also included.

Published
2011
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12. Antimatter transport processes

Author

Van Der Werf, D. P., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Bray, C. C., 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. J., Hydomako, R., Jonsell, Svante, Jørgensen, L. V., 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., Wurtele, J. S., Yamazaki, Y., Van Der Werf, D. P., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Bray, C. C., 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. J., Hydomako, R., Jonsell, Svante, Jørgensen, L. V., 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., Wurtele, J. S., and Yamazaki, Y.

Abstract

A comparison of the 1S-2S transitions of hydrogen and antihydrogen will yield a stringent test of CPT conservation. Necessarily, the antihydrogen atoms need to be trapped to perform high precision spectroscopy measurements. Therefore, an approximately 0.75 T deep neutral atom trap, equivalent to about 0.5 K for ground state (anti)hydrogen atoms, has been superimposed on a Penning-Malmberg trap in which the anti-atoms are formed. The antihydrogen atoms are produced following a number of steps. A bunch of antiprotons from the CERN Antiproton Decelerator is caught in a Penning-Malmberg trap and subsequently sympathetically cooled and then compressed using rotating wall electric fields. A positron plasma, formed in a separate accumulator, is transported to the main system and also compressed. Antihydrogen atoms are then formed by mixing the antiprotons and positrons. The velocity of the anti-atoms, and their binding energies, will strongly depend on the initial conditions of the constituent particles, for example their temperatures and densities, and on the details of the mixing process. In this paper the complete lifecycle of antihydrogen atoms will be presented, starting with the production of the constituent antiparticles and the description of the manipulations necessary to prepare them appropriately for antihydrogen formation. The latter will also be described, as will the possible fates of the anti-atoms.

Published
2010
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13. Antimatter transport processes

Author

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

Published
2010
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14. Antihydrogen Physics at ALPHA/CERNThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008.

Author

Cesar, C. L., primary, Andresen, G. B., additional, Bertsche, W., additional, Bowe, P. D., additional, Bray, C. C., additional, Butler, E., additional, Chapman, S., additional, Charlton, M., additional, Fajans, J., additional, Fujiwara, M. C., additional, Funakoshi, R., additional, Gill, D. R., additional, Hangst, J. S., additional, Hardy, W. N., additional, Hayano, R. S., additional, Hayden, M. E., additional, Humphries, A. J., additional, Hydomako, R., additional, Jenkins, M. J., additional, Jørgensen, L. V., additional, Kurchaninov, L., additional, Lambo, R., additional, Madsen, N., additional, Nolan, P., additional, Olchanski, K., additional, Olin, A., additional, Page, R. D., additional, Povilus, A., additional, Pusa, P., additional, Robicheaux, F., additional, Sarid, E., additional, El Nasr, S. Seif, additional, Silveira, D. M., additional, Storey, J. W., additional, Thompson, R. I., additional, van der Werf, D. P., additional, Wurtele, J. S., additional, and Yamazaki, Y., additional

Published
2009
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15. Compression of Antiproton Clouds for Antihydrogen Trapping

Author

Andresen, G. B., primary, Bertsche, W., additional, Bowe, P. D., additional, Bray, C. C., additional, Butler, E., additional, Cesar, C. L., additional, Chapman, S., additional, Charlton, M., additional, Fajans, J., additional, Fujiwara, M. C., additional, Funakoshi, R., additional, Gill, D. R., additional, Hangst, J. S., additional, Hardy, W. N., additional, Hayano, R. S., additional, Hayden, M. E., additional, Hydomako, R., additional, Jenkins, M. J., additional, Jørgensen, L. V., additional, Kurchaninov, L., additional, Lambo, R., additional, Madsen, N., additional, Nolan, P., additional, Olchanski, K., additional, Olin, A., additional, Povilus, A., additional, Pusa, P., additional, Robicheaux, F., additional, Sarid, E., additional, Seif El Nasr, S., additional, Silveira, D. M., additional, Storey, J. W., additional, Thompson, R. I., additional, van der Werf, D. P., additional, Wurtele, J. S., additional, and Yamazaki, Y., additional

Published
2008
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16. A novel antiproton radial diagnostic based on octupole induced ballistic loss

Author

Andresen, G. B., primary, Bertsche, W., additional, Bowe, P. D., additional, Bray, C. C., additional, Butler, E., additional, Cesar, C. L., additional, Chapman, S., additional, Charlton, M., additional, Fajans, J., additional, Fujiwara, M. C., additional, Funakoshi, R., additional, Gill, D. R., additional, Hangst, J. S., additional, Hardy, W. N., additional, Hayano, R. S., additional, Hayden, M. E., additional, Humphries, A. J., additional, Hydomako, R., additional, Jenkins, M. J., additional, Jørgensen, L. V., additional, Kurchaninov, L., additional, Lambo, R., additional, Madsen, N., additional, Nolan, P., additional, Olchanski, K., additional, Olin, A., additional, Page, R. D., additional, Povilus, A., additional, Pusa, P., additional, Robicheaux, F., additional, Sarid, E., additional, El Nasr, S. Seif, additional, Silveira, D. M., additional, Storey, J. W., additional, Thompson, R. I., additional, van der Werf, D. P., additional, Wurtele, J. S., additional, and Yamazaki, Y., additional

Published
2008
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17. Particle Physics Aspects of Antihydrogen Studies with ALPHA at CERN

Author

Fujiwara, M. C., primary, Andresen, G. B., additional, Bertsche, W., additional, Bowe, P. D., additional, Bray, C. C., additional, Butler, E., additional, Cesar, C. L., additional, Chapman, S., additional, Charlton, M., additional, Fajans, J., additional, Funakoshi, R., additional, Gill, D. R., additional, Hangst, J. S., additional, Hardy, W. N., additional, Hayano, R. S., additional, Hayden, M. E., additional, Humphries, A. J., additional, Hydomako, R., additional, Jenkins, M. J., additional, Jo̸rgensen, L. V., additional, Kurchaninov, L., additional, Lai, W., additional, Lambo, R., additional, Madsen, N., additional, Nolan, P., additional, Olchanski, K., additional, Olin, A., additional, Povilus, A., additional, Pusa, P., additional, Robicheaux, F., additional, Sarid, E., additional, El Nasr, S. Seif, additional, Silveira, D. M., additional, Storey, J. W., additional, Thompson, R. I., additional, van der Werf, D. P., additional, Wasilenko, L., additional, Wurtele, J. S., additional, Yamazaki, Y., additional, Kanai, Yasuyuki, additional, and Yamazaki, Yasunori, additional

Published
2008
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18. First Attempts at Antihydrogen Trapping in ALPHA

Author

Andresen, G. B., primary, Bertsche, W., additional, Bowe, P. D., additional, Bray, C. C., additional, Butler, E., additional, Cesar, C. L., additional, Chapman, S., additional, Charlton, M., additional, Fajans, J., additional, Fujiwara, M. C., additional, Funakoshi, R., additional, Gill, D. R., additional, Hangst, J. S., additional, Hardy, W. N., additional, Hayano, R. S., additional, Hayden, M. E., additional, Humphries, A. J., additional, Hydomako, R., additional, Jenkins, M. J., additional, Jo̸rgensen, L. V., additional, Kurchaninov, L., additional, Lambo, R., additional, Madsen, N., additional, Nolan, P., additional, Olchanski, K., additional, Olin, A., additional, Page, R. D., additional, Povilus, A., additional, Pusa, P., additional, Robicheaux, F., additional, Sarid, E., additional, El Nasr, S. Seif, additional, Silveira, D. M., additional, Storey, J. W., additional, Thompson, R. I., additional, van der Werf, D. P., additional, Wurtele, J. S., additional, Yamazaki, Y., additional, Kanai, Yasuyuki, additional, and Yamazaki, Yasunori, additional

Published
2008
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19. Antiproton compression and radial measurements

Author

Andresen, G. B., primary, Bertsche, W., additional, Bowe, P. D., additional, Bray, C. C., additional, Butler, E., additional, Cesar, C. L., additional, Chapman, S., additional, Charlton, M., additional, Fajans, J., additional, Fujiwara, M. C., additional, Funakoshi, R., additional, Gill, D. R., additional, Hangst, J. S., additional, Hardy, W. N., additional, Hayano, R. S., additional, Hayden, M. E., additional, Humphries, A. J., additional, Hydomako, R., additional, Jenkins, M. J., additional, Jo̸rgensen, L. V., additional, Kurchaninov, L., additional, Lambo, R., additional, Madsen, N., additional, Nolan, P., additional, Olchanski, K., additional, Olin, A., additional, Page, R. D., additional, Povilus, A., additional, Pusa, P., additional, Robicheaux, F., additional, Sarid, E., additional, El Nasr, S. Seif, additional, Silveira, D. M., additional, Storey, J. W., additional, Thompson, R. I., additional, van der Werf, D. P., additional, Wurtele, J. S., additional, Yamazaki, Y., additional, Kanai, Yasuyuki, additional, and Yamazaki, Yasunori, additional

Published
2008
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20. ALPHA ANTIHYDROGEN EXPERIMENT.

Author

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., and JONSELL, S.

Subjects
ANTIHYDROGEN, SYMMETRY (Physics), PARTICLES, ANTIMATTER, QUANTUM theory
Published
2010

21. Antiproton, positron, and electron imaging with a microchannel plate/phosphor detector.

Author

Andresen, G. B., Bertsche, W., Bowe, P. D., Bray, C. C., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M. C., Gill, D. R., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jørgensen, L. V., Kerrigan, S. J., and Kurchaninov, L.

Subjects
MICROREACTORS, FLUORESCENT screens, ANTIPROTONS, POSITRONS, ELECTRONS, SCIENTIFIC apparatus & instruments
Abstract

A microchannel plate (MCP)/phosphor screen assembly has been used to destructively measure the radial profile of cold, confined antiprotons, electrons, and positrons in the ALPHA experiment, with the goal of using these trapped particles for antihydrogen creation and confinement. The response of the MCP to low energy (10–200 eV, <1 eV spread) antiproton extractions is compared to that of electrons and positrons. [ABSTRACT FROM AUTHOR]

Published
2009
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22. Magnetic multipole induced zero-rotation frequency bounce-resonant loss in a Penning–Malmberg trap used for antihydrogen trapping.

Author

Andresen, G. B., Bertsche, W., Bray, C. C., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M. C., Gill, D. R., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jo\rgensen, L. V., Kerrigan, S. J., Keller, J., Kurchaninov, L., and Lambo, R.

Subjects
PROTONS, TRAPPED-particle instabilities, TOKAMAKS, ELECTROMAGNETIC fields, MAGNETOHYDRODYNAMICS
Abstract

In many antihydrogen trapping schemes, antiprotons held in a short-well Penning–Malmberg trap are released into a longer well. This process necessarily causes the bounce-averaged rotation frequency [formula] of the antiprotons around the trap axis to pass through zero. In the presence of a transverse magnetic multipole, experiments and simulations show that many antiprotons (over 30% in some cases) can be lost to a hitherto unidentified bounce-resonant process when [formula] is close to zero. [ABSTRACT FROM AUTHOR]

Published
2009
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23. Search for trapped antihydrogen: First candidate events

Author

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

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