Search

Your search keyword '"Hydomako, R."' showing total 133 results
Start Over Author "Hydomako, R."
133 results on '"Hydomako, R."'

1. 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
Physics - Atomic Physics, High Energy Physics - Experiment, Nuclear Experiment, Physics - Plasma Physics
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
Full Text
View/download PDF

2. Confinement of antihydrogen for 1000 seconds

Author

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

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

Atoms made of a particle and an antiparticle are unstable, usually surviving less than a microsecond. Antihydrogen, made entirely of antiparticles, is believed to be stable, and it is this longevity that holds the promise of precision studies of matter-antimatter symmetry. We have recently demonstrated trapping of antihydrogen atoms by releasing them after a confinement time of 172 ms. A critical question for future studies is: how long can anti-atoms be trapped? Here we report the observation of anti-atom confinement for 1000 s, extending our earlier results by nearly four orders of magnitude. Our calculations indicate that most of the trapped anti-atoms reach the ground state. Further, we report the first measurement of the energy distribution of trapped antihydrogen which, coupled with detailed comparisons with simulations, provides a key tool for the systematic investigation of trapping dynamics. These advances open up a range of experimental possibilities, including precision studies of CPT symmetry and cooling to temperatures where gravitational effects could become apparent., Comment: 30 pages, 4 figures

Published
2011
Full Text
View/download PDF

3. Centrifugal separation and equilibration dynamics in an electron-antiproton plasma

Author

Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., 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., Jonsell, S., Madsen, N., Menary, S., Nolan, P., 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., Wurtele, J. S., and Yamazaki, Y.

Subjects
Physics - Plasma Physics, High Energy Physics - Experiment, Physics - Atomic Physics
Abstract

Charges in cold, multiple-species, non-neutral plasmas separate radially by mass, forming centrifugally-separated states. Here, we report the first detailed measurements of such states in an electron-antiproton plasma, and the first observations of the separation dynamics in any centrifugally-separated system. While the observed equilibrium states are expected and in agreement with theory, the equilibration time is approximately constant over a wide range of parameters, a surprising and as yet unexplained result. Electron-antiproton plasmas play a crucial role in antihydrogen trapping experiments.

Published
2011
Full Text
View/download PDF

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
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

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
Physics - Plasma Physics, High Energy Physics - Experiment, Nuclear Experiment, Physics - Accelerator Physics, Physics - Atomic Physics
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
Full Text
View/download PDF

6. Antihydrogen formation dynamics in a multipolar neutral anti-atom trap

Author

Andresen, G. B., Bertsche, W., Bowe, P. D., Bray, 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., 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
High Energy Physics - Experiment, Physics - Atomic Physics, Physics - Plasma Physics
Abstract

Antihydrogen production in a neutral atom trap formed by an octupole-based magnetic field minimum is demonstrated using field-ionization of weakly bound anti-atoms. Using our unique annihilation imaging detector, we correlate antihydrogen detection by imaging and by field-ionization for the first time. We further establish how field-ionization causes radial redistribution of the antiprotons during antihydrogen formation and use this effect for the first simultaneous measurements of strongly and weakly bound antihydrogen atoms. Distinguishing between these provides critical information needed in the process of optimizing for trappable antihydrogen. These observations are of crucial importance to the ultimate goal of performing CPT tests involving antihydrogen, which likely depends upon trapping the anti-atom.

Published
2010
Full Text
View/download PDF

7. The ALPHA antihydrogen trapping apparatus

Author

Amole, C, Andresen, GB, Ashkezari, MD, Baquero-Ruiz, M, Bertsche, W, Bowe, PD, Butler, E, Capra, A, Carpenter, PT, Cesar, CL, Chapman, S, Charlton, M, Deller, A, Eriksson, S, Escallier, J, Fajans, J, Friesen, T, Fujiwara, MC, Gill, DR, Gutierrez, A, Hangst, JS, Hardy, WN, Hayano, RS, Hayden, ME, Humphries, AJ, Hurt, JL, Hydomako, R, Isaac, CA, Jenkins, MJ, Jonsell, S, Jørgensen, LV, Kerrigan, SJ, Kurchaninov, L, Madsen, N, Marone, A, McKenna, JTK, Menary, S, Nolan, P, Olchanski, K, Olin, A, Parker, B, Povilus, A, Pusa, P, Robicheaux, F, Sarid, E, Seddon, D, Nasr, S Seif El, Silveira, DM, So, C, Storey, JW, Thompson, RI, Thornhill, J, Wells, D, van der Werf, DP, Wurtele, JS, Yamazaki, Y, and Collaboration, ALPHA

Subjects
Antihydrogen, Antiprotons, Positrons, Neutral atom trap, Microwaves, Silicon Vertex Detector, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences, Nuclear & Particles Physics
Abstract

The ALPHA collaboration, based at CERN, has recently succeeded in confining cold antihydrogen atoms in a magnetic minimum neutral atom trap and has performed the first study of a resonant transition of the anti-atoms. The ALPHA apparatus will be described herein, with emphasis on the structural aspects, diagnostic methods and techniques that have enabled antihydrogen trapping and experimentation to be achieved. © 2013 Elsevier B.V.

Published
2014

8. Production of antihydrogen at reduced magnetic field for anti-atom trapping

Author

Andresen, G B, Bertsche, W, Boston, A, Bowe, P D, Cesar, C L, Chapman, S, Charlton, M, Chartier, M, Deutsch, A, Fajans, J, Fujiwara, M C, Funakoshi, R, Gill, D R, Gomberoff, K, Hangst, J S, Hayano, R S, Hydomako, R, Jenkins, M J, Jorgensen, L V, Kurchaninov, L, Madsen, N, Nolan, P, Olchanski, K, Olin, A, Page, R D, Povilus, A, Robicheaux, F, Sarid, E, Silveira, D M, Storey, J W, Thompson, R I, van derWerf, D P, Wurtele, J S, and Yamazaki, Y

Subjects
Nuclear Experiment
Abstract

We have demonstrated production of antihydrogen in a 1$,$T solenoidal magnetic field. This field strength is significantly smaller than that used in the first generation experiments ATHENA (3$,$T) and ATRAP (5$,$T). The motivation for using a smaller magnetic field is to facilitate trapping of antihydrogen atoms in a neutral atom trap surrounding the production region. We report the results of measurements with the ALPHA (Antihydrogen Laser PHysics Apparatus) device, which can capture and cool antiprotons at 3$,$T, and then mix the antiprotons with positrons at 1$,$T. We infer antihydrogen production from the time structure of antiproton annihilations during mixing, using mixing with heated positrons as the null experiment, as demonstrated in ATHENA. Implications for antihydrogen trapping are discussed.

Published
2008
Full Text
View/download PDF

9. 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
Full Text
View/download PDF

10. 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
Full Text
View/download PDF

11. 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
Full Text
View/download PDF

12. Towards Antihydrogen Confinement with the ALPHA Antihydrogen Trap

Author

Fujiwara, M. C., Andresen, G., Bertsche, W., Boston, A., Bowe, P. D., Cesar, C. L., Chapman, S., Charlton, M., Chartier, M., Deutsch, A., Fajans, J., Funakoshi, R., Gill, D. R., Gomberoff, K., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hydomako, R., Jenkins, M. J., Jorgensen, L. V., Kurchaninov, L., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Page, R. D., Povilus, A., Robicheaux, F., Sarid, E., Silveira, D. M., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

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

ALPHA is an international project that has recently begun experimentation at CERN's Antiproton Decelerator (AD) facility. The primary goal of ALPHA is stable trapping of cold antihydrogen atoms with the ultimate goal of precise spectroscopic comparisons with hydrogen. We discuss the status of the ALPHA project and the prospects for antihydrogen trapping., Comment: Invited talk at International Conference on Trapped Charged Particles and Fundamental Physics: TCP06, Parksville, BC, Canada, September 2006. To be published in Hyperfine Interactions

Published
2007
Full Text
View/download PDF

14. Microwave-plasma interactions studied via mode diagnostics in ALPHA

Author

Friesen, T., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Eriksson, S., Fajans, J., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jonsell, S., Kurchaninov, L., 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., Wurtele, J. S., Yamazaki, Y., and ALPHA Collaboration

Published
2012
Full Text
View/download PDF

15. Trapped antihydrogen

Author

Butler, E., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., 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., Jenkins, M. J., Jonsell, S., Jørgensen, L. V., Kemp, S. L., Kurchaninov, L., Madsen, N., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Rasmussen, C. Ø., 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., and ALPHA Collaboration

Published
2012
Full Text
View/download PDF

16. Alternative method for reconstruction of antihydrogen annihilation vertices

Author

Amole, C., Ashkezari, M. D., Andresen, G. B., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., 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., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jonsell, S., Kurchaninov, L., 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., Wurtele, J. S., Yamazaki, Y., and ALPHA Collaboration

Published
2012
Full Text
View/download PDF

17. Antihydrogen formation by autoresonant excitation of antiproton plasmas

Author

Bertsche, William Alan, Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bowe, P. D., Carpenter, P. T., Butler, E., Cesar, C. L., Chapman, S. F., Charlton, M., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hurt, J. L., Hydomako, R., Jonsell, S., Kurchaninov, L., 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., Werf, D. P. van der, Wurtele, J. S., Yamazaki, Y., and ALPHA Collaboration

Published
2012
Full Text
View/download PDF

18. 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
Full Text
View/download PDF

19. Towards trapped antihydrogen

Author

Jørgensen, L.V., Andresen, G., Bertsche, W., Boston, A., Bowe, P.D., Cesar, C.L., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M.C., Funakoshi, R., Gill, D.R., Hangst, J.S., Hayano, R.S., Hydomako, R., Jenkins, M.J., Kurchaninov, L., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Page, R.D., Povilus, A., Robicheaux, F., Sarid, E., Silveira, D.M., Storey, J.W., Thompson, R.I., van der Werf, D.P., Wurtele, J.S., and Yamazaki, Y.

Published
2008
Full Text
View/download PDF

20. Antihydrogen physics at ALPHA/CERN

Author

Cesar, C.L., Andresen, G.B., Bertsche, W., Bowe, P.D., Bray, C.C., Butler, E., 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
Atomic spectroscopy -- Methods, Antimatter -- Atomic properties, Physics, Atomic properties, Research, Methods
Abstract

Cold antihydrogen has been produced at CERN (Amoretti et al. (Nature, 419, 456 (2002)), Gabrielse et al. (Phys. Rev. Lett. 89, 213401 (2002))), with the aim of performing a high-precision spectroscopic comparison with hydrogen as a test of the CPT symmetry. Hydrogen, a unique system used for the development of quantum mechanics and quantum electrodynamics, has been continuously used to produce high-precision tests of theories and measurements of fundamental constants and can lead to a very sensitive search for CPT violation. After the initial production of cold antihydrogen atoms by the ATHENA group, the ALPHA Collaboration (http://alpha.web.cem.ch/) has set forth on an experiment to trap and perform high-resolution laser spectroscopy on the 1S-2S transition of both atoms. In this contribution, we will review the motivations, goals, techniques, and recent developments towards this fundamental physics test. We present new discussion on predicted lineshapes for the 1S-2S spectroscopy of trapped atoms in a regime not discussed before. PACS Nos: 36.10.-k, 32.60.+i, 37.10.Gh Nous avons produit de l'anti-hydrogene an CERN (Amoretti et al. (Nature, 419, 456 (2002)), Gabrielse et al. (Phys. Rev. Lett. 89, 213401 (2002))), pour faire des comparaisons spectroscopiques de haute precision avec ''hydrogene dans le cadre d'un test de la symetrie CPT. L'hydrogene, qui a joue un role unique dans le developpement de la mecanique quantique et de 1'electrodynamique quantique, a ete utilise continuellement dans des tests de haute precision des theories et des mesures des constantes fondamentales et pent nous conduire a une recherche tres precise de la violation CPT. Apres que le groupe ATHENA ait produit 'anti-hydrogene froid, l'equipe ALPHA (http://alpha.web.cern.ch/) a developpe un montage pour pieger les deux types d' atome et faire des mesures de spectroscopie laser de haute precision des transitions 1S-2S dans les deux types d'atomes. Nous passons ici en revue les motivations, les buts, les techniques et les developpements recents de ce test fondamental en physique. Nous presentons de nouvelles idees sur la forme des lignes en spectroscopie 1S-2S pour des atomes pieges dans un regime qui n'a pas encore ete discute. [Traduit par la Redaction], I Introduction The very fundamental discrete symmetry of CPT, standing for the simultaneous operations of charge conjugation (C), parity inversion (P), and time reversal (T), is a base for quantum [...]

Published
2009
Full Text
View/download PDF

21. Towards antihydrogen confinement with the ALPHA antihydrogen trap

Author

Fujiwara, M. C., Andresen, G., Bertsche, W., Boston, A., Bowe, P. D., Cesar, C. L., Chapman, S., Charlton, M., Chartier, M., Deutsch, A., Fajans, J., Funakoshi, R., Gill, D. R., Gomberoff, K., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hydomako, R., Jenkins, M. J., Jørgensen, L. V., Kurchaninov, L., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Page, R. D., Povilus, A., Robicheaux, F., Sarid, E., Silveira, D. M., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

Published
2006
Full Text
View/download PDF

22. Towards antihydrogen confinement with the ALPHA antihydrogen trap

Author

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

Published
2007
Full Text
View/download PDF

23. Trapped antihydrogen

Author

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

Published
2010
Full Text
View/download PDF

24. Trapped antihydrogen

Author

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

Abstract

Precision spectroscopic comparison of hydrogen and antihydrogen holds the promise of a sensitive test of the Charge-Parity-Time theorem and matter-antimatter equivalence. The clearest path towards realising this goal is to hold a sample of antihydrogen in an atomic trap for interrogation by electromagnetic radiation. Achieving this poses a huge experimental challenge, as state-of-the-art magnetic-minimum atom traps have well depths of only ∼1T (∼0.5K for ground state antihydrogen atoms). The atoms annihilate on contact with matter and must be ‘born' inside the magnetic trap with low kinetic energies. At the ALPHA experiment, antihydrogen atoms are produced from antiprotons and positrons stored in the form of non-neutral plasmas, where the typical electrostatic potential energy per particle is on the order of electronvolts, more than 104 times the maximum trappable kinetic energy. In November 2010, ALPHA published the observation of 38 antiproton annihilations due to antihydrogen atoms that had been trapped for at least 172ms and then released—the first instance of a purely antimatter atomic system confined for any length of time (Andresen etal., Nature 468:673, 2010). We present a description of the main components of the ALPHA traps and detectors that were key to realising this result. We discuss how the antihydrogen atoms were identified and how they were discriminated from the background processes. Since the results published in Andresen etal. (Nature 468:673, 2010), refinements in the antihydrogen production technique have allowed many more antihydrogen atoms to be trapped, and held for much longer times. We have identified antihydrogen atoms that have been trapped for at least 1,000s in the apparatus (Andresen etal., Nature Physics 7:558, 2011). This is more than sufficient time to interrogate the atoms spectroscopically, as well as to ensure that they have relaxed to their ground state

Published
2018

25. A032 – Health, lifestyle and aging with Multiple Sclerosis: A qualitative study

Author

Arnold, Catherine M., Faulkner, Robert A., Ploughman, Michelle, Austin, Mark, Kearney, Anne, Murdoch, Michelle, Stefanelli, Mark, Godwin, Marshall, Muir, Susan W, Speechley, Mark, Borrie, Michael, Montero-Odasso, Manuel, MacKay-Lyons, M, Creaser, G, Macdonald, A, McKenna, J, Murphy, S, O'Neill, VR, Nilsson, T, Begley, L, Ikert, Kathy M., Long, Kristin M., Bittner, Darren R., Birmingham, Trevor B., Bryant, Dianne M., Richardson, Julie, Letts, Lori, Chan, David, Stratford, Paul, Hand, Carri, Price, David, Hilts, Linda, Coman, Liliana, Edwards, Mary, Baptiste, Sue, Law, Mary, Alexander, Elliot, Rosenthal, Stephanie, Guilcher, Sara, Evans, Cathy, Gattey, M, Hydomako, R, McLean, B, O'Leary, J, Shkopich, K, Klassen, L, Laprade, Judi, Roy, Marla, Laing, M, Di Nicolantonio, L, Goncharova, K, Pui, M, Vas, H, House, R, Switzer-McIntyre, S, Cheifetz, O, Serediuk, F, Park Dorsay, J, Hladysh, G, Woodhouse, L, Dalzell, MA, Shallwani, S, Preuss, RA, Patterson, Debbie, Ptak, Janice, Howe, JA, Brunton, K, Salisbury, K, Sharma, SK, Childerhose, DE, Sharma, S, WalkerJohnston, JA, Barnes, JL, Fisher, Megan E., Aristone, Martha N., Young, Katrina K., Waechter, Laurie E., Landry, Michel D., Taylor, Leslie A., Cooper, Nicole S., Wong, S, Hébert, Luc J., Rowe, Peter, Debouter, Kelly, Lai, Denise, Winn, CS, Chisholm, BA, Hummelbrunner, JA, Wasson, Pamela, Passalent, L, Soever, L, Kennedy, C, Warmington, K, Shupak, R, Thomas, R, Linekar, S, Lundon, K, Morgan, Dale, Kelly, Larry, Hastie, Robyn, Deber, Raisa B., Verrier, Molly C., O'Callaghan, L, Alexander, E, Titus, D, MacDougall, P, Hoens, AM, Garland, SJ, Tunnacliffe, R, Lineker, S, Varatharasan, N, Schneider, R, MacKay, C, Murphy, SM, Wu, Kenneth, Fox, Patricia, Tullis, Elizabeth, Stephenson, Anne L., Davis, AM, Mahomed, N, Badley, EM, Scott, Lisa, Carpenter, Christine, Brander, Rosemary R., Paterson, Margo L., Chan, Yolande E., Reinikka, KJE, French, E, Huijbregts, M, Cleaver, SR, Paulenko, T, Hebert, D, Creaser, GA, MacKenzie, D, Barkhouse-McKeen, C, Shrier, Ian, Freeman, K, Davidson, L, Pelland, L, Wilson, Nicole, Hopkins-Rosseel, Diana, Fraser, M, Wainwright, G, MacCormack, B, Basque Godin, C, Mori, B, Evans, C, Gibson, BE, Thornton, M, Dutton, T, King, J, Lawrence, PJ, Duggan, M, Hoens, A, Geddes, E Lynne, Gill, Caroline, Fong-Lee, Dianna, Lindsay, Jane, McPhail, Stacey, McIntosh, Karen, Marken, Suri L., Dutton, Tanya, Hopkins-Rosseel, DH, Kasdan, P, Fong-Lee, D., Marken, Siri, Moreside, JM, McGill, SM, Juma, S, Winter Di Cola, JL, Kennedy, DM, Dickson, P, Denis, S, Robarts, S, Gollish, J, Salbach, NM, Veinot, P, Jaglal, SB, Bayley, M, Rolfe, D, Dogra, M, Woodhouse, LJ, Spadoni, GF, Stratford, PW, Fox, P, Sessford, J, Beaton, D, Harniman, E, Inrig, T, Baxter, K, Portanova, A, Smuck, L, Connelly, DM, Shaw, J, Adkin, A, Jog, M, Hollway, D, Earl, M, Murphy, A, MacDonald, E, Overend, TJ, Brooks, D, Anderson, CM, Cicutto, L, Keim, M, McAuslan, D, Nonoyama, M, Levac, D., Pierrynowski, M., MacPherson, M, Glassman, L, Jadan, P, MacArthur, L, Landry, M, Frenette, J, Dumont, N, Moreland, JD, DePaul, VG, DeHueck, AL, Musselman, KE, Yang, JF, Tousignant, M, Moffet, H, Boissy, P, Corriveau, H, Cabana, F, Marquis, F, Towns, Megan, Barrett, Lauren, Darling, Catherine, Lee, Michelle, Aganon, Isabel, Hill, Kylie, Brooks, Dina, Robbins, Shawn, Alcock, Greg, Maly, Monica, Jones, Gareth, Birmingham, Trevor, Glazebrook, Cheryl M., Wright, F. Virginia, Martin, MBA, Norton, B, Ramsaran, KD, Street, ME, Syed, SN, Dang, MT, Barclay-Goddard, R, Stratford, P, Miller, P, Karam, J., Zettel, M., Green, K., Carter, D., Lam, F., Evans, C., Yeung, E., Lindquist, NJ, Magis, TF, Rispin, JE, Walton, PE, Kirby, RL, Manns, PJ, Haller, MK, Marler, K, Lore, S, Sottana, B, Crowley, A, Beaudin, V, Sloan, C, Landry, SC, Nigg, BM, Tecante, KE, Albers, Pamela, Devon, Heidi, Nairn, Lacey, Olenick, Betsy, Roach, Stephanie, Arnold, Cathy, Watts, Cathy, Wieler, M, Jones, CA, Allen, J, Haennel, R, Shaw, JA, Zecevic, A, Dal Bello-Haas, V, Harrision, L, Kanthan, R, Lawson, S, Zaluski, N, Petrie, A, Rohs, J, Parker, R, Roy, JS, MacDermid, JC, Roth, JH, Grewal, R, Officer, Alexis, DePaul, Vincent, Bosch, Jackie, Wilkins, Seanne, Wishart, Laurie, Inness, EL, Mansfield, A, Biasin, L, Prajapati, S, Lakhani, B, Mileris, R, McIlroy, WE, Henderson, RJ, Vanik, J, Alyoshkina, N, Diamond, C, Lee, J, Martinov, K, O'Brien, KK, Alexander, R, King, K, Murray, J, Tebeje, M, Bayoumi, AM, Bereket, T, Swinton, M, Norman, G, Solomon, P, Anstey, S, Bethune, M, Thomas, A, Wood-Salomon, E, Curwin, S, D'Amboise, SN, Héroux, ME, Pari, G, Norman, KE, Lee, Linda-Joy, Coppieters, Michel W., Hodges, Paul W., Perreault, Audrey, Tremblay, Louis E., Thibault-Gagnon, S, Gentilcore-Saulnier, E, McLean, L, Kay, JL, McNeely, ML, Campbell, KL, Peddle, CJ, Courneya, KS, Subramanian, SK, Levin, MF, Dechman, G, Tupper, SM, Levesque, L, Reese, H, Nailer, T, Walton, D, Schachter, CL, Stalker, CA, Teram, E, Lasiuk, G, Bartlett, Doreen, Chiarello, Lisa, Jacobs, Diane, Busch, Angela, Novak, Christine B., Anastakis, Dimitri J., Beaton, Dorcas E., Mackinnon, Susan E., Katz, Joel, Figueiredo, S, Finch, L, Jiali, M, Ahmed, S, Huang, A, Mayo, NE, Lochhead, Lois, MacMillan, Peter, DePaul, V, Burridge, H, Kwok, C, Rosario, J, Stogios, C, McKay, E, Moyer, E, Wishart, L, Holly, J, DYER, Joseph-Omer, MAUPAS, Éric, de ANDRADE MELO, Sibele, BOURBONNAIS, Daniel, FORGET, Robert, Shrier, I, Boudier-Reveret, M, Feldman, D, Mazer, B, Rege, SS, Soever, LJ, Fenety, Anne, Hoens, Alison, Harman, Katherine, Bassett, Raewyn, Byrne, Jeannette M., Prentice, Stephen D., Carlesso, Lisa, Cairney, John, Hoogenes, Jennifer, Gabison, S, Nussbaum, EL, Taillon-Hobson, A., McLean, L., Aaron, S., Bilodeau, M., Taillon-Hobson, Anne, McLean, Linda, Aaron, Shawn, Bilodeau, Martin, Zbarsky, Kathryn, Parsley, Dana, Clegg, Heather, Welch, Tyler, Fernandes, Catherine, Jaglal, Susan, Inness, Liz, Williams, Josh, McIlroy, William, Howe, Jo-Anne, Yardley, D, Benoit, M, Blake, T, Gillies, G, Ho, R, MacKinnon, M, Chesworth, BM, Busch, AJ, Dooley, A, Coons, S, Crockett, K, Mucha, J, Kean, CO, Birmingham, TB, King, LK, Giffin, JR, Lourenço, Christiane B., Subramanian, Sandeep, Sveistrup, Heidi, Levin, Mindy F., DESMEULES, FRANÇOIS, DIONNE, CLERMONT E., BELZILE, ÉTIENNE L., BOURBONNAIS, RENÉE, FRÉMONT, PIERRE, Richards, CL, Schneider, GM, Smith, AD, Bath, B, Bourassa, R, Lovo Grona, S, Schneider, KJ, Emery, Carolyn, Norman, Kathleen, Pearson, Neil, Woodhouse, Linda, Pelland, Lucie, Werstine, Rob, and Schneider, Kathryn

Subjects
active transfer strategies for informing clinical practice through information technologies, injury prevention, health human resources management strategies, Merging Research and Practice, implementation and management strategies, Abstracts, clinical experience, clinical skills and clinical reasoning modules in orthopaedic practice, Special Sessions, evolving physiotherapist roles, chronic disease prevention, neurological, basic science or clinically focused research on targeted physiotherapy interventions, Scientific sessions, fundamental scientific research, mobility, Newfoundland, Canadian Physiotherapy Association Congress 2010, population health services, advances in research related to neuromusculoskeletal practice, health system reform, patient and client preference, clinical research and the reciprocal transfer of knowledge between clinical practice and research, innovative service delivery models, post-operative management of acute care patients, promotion of research, practice and patient/client care in the neuromusculoskeletal area, Canada, assessment and treatment of disability that arises from both spinal and peripheral pathologies, Abstracts, CPA Congress 2010, role of physiotherapists in primary health care, exercise prescription, Physical Therapy, Sports Therapy and Rehabilitation, Health Promotion, clinical decision making, St. John's, evidence based practice model, informing the development of clinical research questions, determinants of health, innovative models of practice, physiotherapy leadership development, Physio10, Leadership in Action, public and patient education, musculoskeletal, benchmarking areas of practice, inter-professional collaboration and education strategies, Neuromusculoskeletal Practice, public, private and independent practice management of physiotherapy services, Merging Research with Practice, cardio-respiratory
Published
2010
Full Text
View/download PDF

26. Search for trapped antihydrogen in ALPHA

Author

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

Subjects
Condensed Matter::Quantum Gases, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics
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
Full Text
View/download PDF

27. Antiparticle sources for antihydrogen production and trapping

Author

Charlton, M., Bruun Andresen, Gorm, Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, Paul David, Bray, C.C., Butler, E., Chapman, S., Friesen, T., Fujiwara, M.C., Gill, D.R., Hangst, Jeffrey S., Hardy, W.N., Hayano, R.S., Hayden, M.E., Humphries, A.J., Hydomako, R., Jonsell, S., Jørgensen, 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., 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.

Subjects
Physics::General Physics, Physics::Atomic and Molecular Clusters, Physics::Accelerator Physics, High Energy Physics::Experiment, Physics::Atomic Physics
Abstract

Sources of positrons and antiprotons that are currently used for the formationof 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
Full Text
View/download PDF

28. 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
Full Text
View/download PDF

29. The ALPHA antihydrogen trapping apparatus

Author

Amole, C., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Butler, E., Capra, A., Carpenter, P. T., Cesar, C. L., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Escallier, J., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hurt, J. L., Hydomako, R., Isaac, C. A., Jenkins, M. J., Jonsell, Svante, Jörgensen, L. V., Kerrigan, S. J., Kurchaninov, L., Madsen, N., Morone, A., McKenna, J. T. K., Menary, S., Nolan, P., Olchanski, K., Olin, A., Parker, B., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Seddon, D., El Nasr, S. Seif, Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., Thornhill, J., Wells, D., van der Werf, D. P., Wurtele, J. S., Yamazaki, Y., Amole, C., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Butler, E., Capra, A., Carpenter, P. T., Cesar, C. L., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Escallier, J., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hurt, J. L., Hydomako, R., Isaac, C. A., Jenkins, M. J., Jonsell, Svante, Jörgensen, L. V., Kerrigan, S. J., Kurchaninov, L., Madsen, N., Morone, A., McKenna, J. T. K., Menary, S., Nolan, P., Olchanski, K., Olin, A., Parker, B., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Seddon, D., El Nasr, S. Seif, Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., Thornhill, J., Wells, D., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

Abstract

The ALPHA collaboration, based at CERN, has recently succeeded in confining cold antihydrogen atoms in a magnetic minimum neutral atom trap and has performed the first study of a resonant transition of the anti-atoms. The ALPHA apparatus will be described herein, with emphasis on the structural aspects, diagnostic methods and techniques that have enabled antihydrogen trapping and experimentation to be achieved., AuthorCount:56

Published
2014
Full Text
View/download PDF

30. 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, 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, 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.

Published
2011
Full Text
View/download PDF

31. 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

32. 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

33. Antimatter Plasmas in a Multipole Trap for Antihydrogen

Author

Andresen, G., Bertsche, W., Boston, A., Bowe, Paul David, Cesar, C.L., Chapman, S., Charlton, M., Chartier, M., Deutsch, A., Fajans, J., Fujiwara, M.C., Funakoshi, R., Gill, D.R., Gomberoff, K., Hangst, Jeffrey S., Hayano, R.S., Hydomako, R., Jenkins, M.J., Jørgensen, L.V., Kurchaninov, L., Madsen, Niels, Nolan, P., Olchanski, K., Olin, A., Povilus, A., Robicheaux, F., Sarid, E., Silveira, D.M., Storey, J.W., Telle, H.H., Thompson, R.I., van der Werf, D.P., Wurtele, J.S., and Yamazaki, Y.

Published
2007

34. FIRST IMAGES FROM THE CRIPT MUON TOMOGRAPHY SYSTEM

Author

ARMITAGE, J., primary, BOTTE, J., additional, BOUDJEMLINE, K., additional, ERLANDSON, A., additional, ROBICHAUD, A., additional, BUENO, J., additional, BRYMAN, D., additional, GAZIT, R., additional, HYDOMAKO, R., additional, LIU, Z., additional, ANGHEL, V., additional, GOLOVKO, V. V., additional, JEWETT, C., additional, JONKMANS, G., additional, THOMPSON, M., additional, CHARLES, E., additional, GALLANT, G., additional, DROUIN, P-L., additional, WALLER, D., additional, STOCKI, T. J., additional, COUSINS, T., additional, and NOEL, S., additional

Published
2014
Full Text
View/download PDF

35. The ALPHA antihydrogen trapping apparatus

Author

Amole, C., primary, Andresen, G.B., additional, Ashkezari, M.D., additional, Baquero-Ruiz, M., additional, Bertsche, W., additional, Bowe, P.D., additional, Butler, E., additional, Capra, A., additional, Carpenter, P.T., additional, Cesar, C.L., additional, Chapman, S., additional, Charlton, M., additional, Deller, A., additional, Eriksson, S., additional, Escallier, J., additional, Fajans, J., additional, Friesen, T., additional, Fujiwara, M.C., additional, Gill, D.R., additional, Gutierrez, A., additional, Hangst, J.S., additional, Hardy, W.N., additional, Hayano, R.S., additional, Hayden, M.E., additional, Humphries, A.J., additional, Hurt, J.L., additional, Hydomako, R., additional, Isaac, C.A., additional, Jenkins, M.J., additional, Jonsell, S., additional, Jørgensen, L.V., additional, Kerrigan, S.J., additional, Kurchaninov, L., additional, Madsen, N., additional, Marone, A., additional, McKenna, J.T.K., additional, Menary, S., additional, Nolan, P., additional, Olchanski, K., additional, Olin, A., additional, Parker, B., additional, Povilus, A., additional, Pusa, P., additional, Robicheaux, F., additional, Sarid, E., additional, Seddon, D., additional, Seif El Nasr, S., additional, Silveira, D.M., additional, So, C., additional, Storey, J.W., additional, Thompson, R.I., additional, Thornhill, J., additional, Wells, D., additional, van der Werf, D.P., additional, Wurtele, J.S., additional, and Yamazaki, Y., additional

Published
2014
Full Text
View/download PDF

36. Antihydrogen annihilation reconstruction with the ALPHA silicon detector

Author

Andresen, G. B., Ashkezari, M. D., Bertsche, W., Bowe, P. D., 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., Hayano, R. S., Humphries, A. J., Hydomako, R., Jonsell, Svante, Jorgensen, L. V., Kurchaninov, L., Madsen, N., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Sarid, E., el Nasr, S. Seif, Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., van der Werf, D. P., Yamazaki, Y., Andresen, G. B., Ashkezari, M. D., Bertsche, W., Bowe, P. D., 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., Hayano, R. S., Humphries, A. J., Hydomako, R., Jonsell, Svante, Jorgensen, L. V., Kurchaninov, L., Madsen, N., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Sarid, E., el Nasr, S. Seif, Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., van der Werf, D. P., and Yamazaki, Y.

Abstract

The ALPHA experiment has succeeded in trapping antihydrogen, a major milestone on the road to spectroscopic comparisons of antihydrogen with hydrogen. An annihilation vertex detector, which determines the time and position of antiproton annihilations, has been central to this achievement. This detector, an array of double-sided silicon microstrip detector modules arranged in three concentric cylindrical tiers, is sensitive to the passage of charged particles resulting from antiproton annihilation. This article describes the method used to reconstruct the annihilation location and to distinguish the annihilation signal from the cosmic ray background. Recent experimental results using this detector are outlined., AuthorCount:39

Published
2012
Full Text
View/download PDF

37. The ALPHA-detector : Module Production and Assembly

Author

Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., 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., Jenkins, M. J., Jonsell, Svante, Jorgensen, L. V., Kurchaninov, L., Madsen, N., McKenna, J. T. K., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sampson, J., Sarid, E., Seddon, D., el Nasr, S. Seif, Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., Thornhill, J., Wells, D., van der Werf, D. P., Wurtele, J. S., Yamazaki, Y., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., 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., Jenkins, M. J., Jonsell, Svante, Jorgensen, L. V., Kurchaninov, L., Madsen, N., McKenna, J. T. K., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sampson, J., Sarid, E., Seddon, D., el Nasr, S. Seif, Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., Thornhill, J., Wells, D., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

Abstract

ALPHA is one of the experiments situated at CERN's Antiproton Decelerator (AD). A Silicon Vertex Detector (SVD) is placed to surround the ALPHA atom trap. The main purpose of the SVD is to detect and locate antiproton annihilation events by means of the emitted charged pions. The SVD system is presented with special focus given to the design, fabrication and performance of the modules., AuthorCount:47

Published
2012
Full Text
View/download PDF

38. 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, Svante, 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., Wurtele, J. S., 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, Svante, 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.

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 annihilate. 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., 38

Published
2012
Full Text
View/download PDF

39. 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
Full Text
View/download PDF

40. 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
Full Text
View/download PDF

41. Confinement of antihydrogen for 1,000 seconds

Author

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

Abstract

Atoms made of a particle and an antiparticle are unstable, usually surviving less than a microsecond. Antihydrogen, made entirely of antiparticles, is believed to be stable, and it is this longevity that holds the promise of precision studies of matter-antimatter symmetry. We have recently demonstrated trapping of antihydrogen atoms by releasing them after a confinement time of 172 ms. A critical question for future studies is: how long can anti-atoms be trapped? Here, we report the observation of anti-atom confinement for 1,000 s, extending our earlier results by nearly four orders of magnitude. Our calculations indicate that most of the trapped anti-atoms reach the ground state. Further, we report the first measurement of the energy distribution of trapped antihydrogen, which, coupled with detailed comparisons with simulations, provides a key tool for the systematic investigation of trapping dynamics. These advances open up a range of experimental possibilities, including precision studies of charge-parity-time reversal symmetry and cooling to temperatures where gravitational effects could become apparent., authorCount :40

Published
2011
Full Text
View/download PDF

42. Autoresonant Excitation of Antiproton Plasmas

Author

Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Butler, E., Carpenter, P. T., 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. E., Humphries, A. J., Hurt, J. L., Hydomako, R., Jonsell, Svante, 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., Wurtele, J. S., Yamazaki, Y., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Butler, E., Carpenter, P. T., 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. E., Humphries, A. J., Hurt, J. L., Hydomako, R., Jonsell, Svante, 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., Wurtele, J. S., and Yamazaki, Y.

Abstract

We demonstrate controllable excitation of the center-of-mass longitudinal motion of a thermal antiproton plasma using a swept-frequency autoresonant drive. When the plasma is cold, dense, and highly collective in nature, we observe that the entire system behaves as a single-particle nonlinear oscillator, as predicted by a recent theory. In contrast, only a fraction of the antiprotons in a warm plasma can be similarly excited. Antihydrogen was produced and trapped by using this technique to drive antiprotons into a positron plasma, thereby initiating atomic recombination, authorCount :37

Published
2011
Full Text
View/download PDF

43. 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
Full Text
View/download PDF

44. 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
Full Text
View/download PDF

45. Evaporative Cooling of Antiprotons to Cryogenic Temperatures

Author

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, Svante, 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., 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, Svante, 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.

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 CPT test on trapped antihydrogen is a long-standing goal.

Published
2010
Full Text
View/download PDF

46. Evaporative cooling of antiprotons for the production of trappable antihydrogen

Author

Silveira, D. M., primary, Andresen, G. B., additional, Ashkezari, M. D., additional, Baquero-Ruiz, M., additional, Bertsche, W., additional, Bowe, P. D., 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, Hayden, M. E., additional, Hydomako, R., additional, Jonsell, S., additional, Kurchaninov, L., 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, So, C., additional, Storey, J. W., additional, Thompson, R. I., additional, van der Werf, D. P., additional, and Wurtele, J. S., additional

Published
2013
Full Text
View/download PDF

47. Construction, commissioning and first data from the CRIPT muon tomography project

Author

Anghel, V., primary, Armitage, J., additional, Botte, J., additional, Boudjemline, K., additional, Bryman, D., additional, Bueno, J., additional, Charles, E., additional, Cousins, T., additional, Erlandson, A., additional, Gallant, G., additional, Gazit, R., additional, Golovko, V.V., additional, Hydomako, R., additional, Jewett, C., additional, Jonkmans, G., additional, Liu, Z., additional, Magill, M., additional, Noel, S., additional, Oakham, G., additional, Robichaud, A., additional, Stocki, T.J., additional, Thompson, M., additional, and Waller, D., additional

Published
2012
Full Text
View/download PDF

48. Machine learning for the cosmic ray inspection and passive tomography project (CRIPT)

Author

Stocki, T. J., primary, Boudjemline, K., additional, Bryman, D., additional, Bueno, J., additional, Charles, E., additional, Cousins, T., additional, Erlandson, A., additional, Gallant, G., additional, Gazit, R., additional, Golovko, V.V., additional, Hydomako, R., additional, Warren, C., additional, Jewett, C., additional, Jonkmans, G., additional, Liu, Z., additional, McCall, M., additional, Noel, S., additional, Oakham, G., additional, Robichaud, A., additional, Thompson, M., additional, Waller, D., additional, Magill, M. P. C., additional, Morgan, B. E., additional, Smith, J., additional, Ong, D., additional, Anghel, V. N. P., additional, Armitage, J., additional, and Botte, J., additional

Published
2012
Full Text
View/download PDF

49. Antihydrogen annihilation reconstruction with the ALPHA silicon detector

Author

Andresen, G.B., primary, Ashkezari, M.D., additional, Bertsche, W., additional, Bowe, P.D., additional, Butler, E., additional, Cesar, C.L., additional, Chapman, S., additional, Charlton, M., additional, Deller, A., additional, Eriksson, S., additional, Fajans, J., additional, Friesen, T., additional, Fujiwara, M.C., additional, Gill, D.R., additional, Gutierrez, A., additional, Hangst, J.S., additional, Hardy, W.N., additional, Hayden, M.E., additional, Hayano, R.S., additional, Humphries, A.J., additional, Hydomako, R., additional, Jonsell, S., additional, Jørgensen, L.V., additional, Kurchaninov, L., additional, Madsen, N., additional, Menary, S., additional, Nolan, P., additional, Olchanski, K., additional, Olin, A., additional, Povilus, A., additional, Pusa, P., additional, Sarid, E., additional, Seif el Nasr, S., additional, Silveira, D.M., additional, So, C., additional, Storey, J.W., additional, Thompson, R.I., additional, van der Werf, D.P., additional, and Yamazaki, Y., additional

Published
2012
Full Text
View/download PDF

50. Discriminating between antihydrogen and mirror-trapped antiprotons in a minimum-B trap

Author

Amole, C, primary, Andresen, G B, additional, Ashkezari, M D, additional, Baquero-Ruiz, M, additional, Bertsche, W, additional, Butler, E, additional, Cesar, C L, additional, Chapman, S, additional, Charlton, M, additional, Deller, A, additional, Eriksson, S, additional, Fajans, J, additional, Friesen, T, additional, Fujiwara, M C, additional, Gill, D R, additional, Gutierrez, A, additional, Hangst, J S, additional, Hardy, W N, additional, Hayden, M E, additional, Humphries, A J, additional, Hydomako, R, additional, Kurchaninov, L, additional, Jonsell, S, 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, van der Werf, D P, additional, and Wurtele, J S, additional

Published
2012
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results