Evaporative cooling of antiprotons for the production of trappable antihydrogen

Silveira, D. M; 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; Hayden, M. E; Hydomako, R; Jonsell, S; Kurchaninov, L; Madsen, N; Menary, S; Nolan, P; Olchanski, K; Olin, A; Povilus, A; Pusa, P; Robicheaux, F; Sarid, E; So, C; Storey, J. W; Thompson, R. I; van, D. P.; Wurtele, J. S; der, Dirk van; Madsen, Niels

doi:10.1063/1.4796072

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Evaporative cooling of antiprotons for the production of trappable antihydrogen

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

, Niels Madsen

AIP Conference Proceedings, Volume: 1521, Pages: 165 - 174

Swansea University Authors: Dirk van der Werf , Niels Madsen

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DOI (Published version): 10.1063/1.4796072

Abstract

We describe the implementation of evaporative cooling of charged particles in the ALPHA apparatus. Forced evaporation has been applied to cold samples of antiprotons held in Malmberg-Penning traps. Temperatures on the order of 10 K were obtained, while retaining a significant fraction of the initial...

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Published in:	AIP Conference Proceedings
ISSN:	0094-243X
Published:	2013
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa14622
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Abstract:	We describe the implementation of evaporative cooling of charged particles in the ALPHA apparatus. Forced evaporation has been applied to cold samples of antiprotons held in Malmberg-Penning traps. Temperatures on the order of 10 K were obtained, while retaining a significant fraction of the initial number of particles. We have developed a model for the evaporation process based on simple rate equations and applied it succesfully to the experimental data. We have also observed radial re-distribution of the clouds following evaporation, explained by simple conservation laws. We discuss the relevance of this technique for the recent demonstration of magnetic trapping of antihydrogen.
College:	Faculty of Science and Engineering
Start Page:	165
End Page:	174

Evaporative cooling of antiprotons for the production of trappable antihydrogen

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