Fast Track Communication

doi:10.1088/0953-4075/41/1/011001

FAST TRACK COMMUNICATION

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

G B Andresen et al 2008 J. Phys. B: At. Mol. Opt. Phys. 41 011001 (5pp) doi: 10.1088/0953-4075/41/1/011001

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G B Andresen¹, W Bertsche^2,12, A Boston³, P D Bowe¹, C L Cesar⁴, S Chapman², M Charlton⁵, M Chartier³, A Deutsch^2,13, J Fajans², M C Fujiwara⁶, R Funakoshi⁷, D R Gill⁶, K Gomberoff^2,13,14, J S Hangst¹, R S Hayano⁷, R Hydomako⁸, M J Jenkins⁵, L V Jørgensen⁵, L Kurchaninov⁶, N Madsen⁵, P Nolan³, K Olchanski⁶, A Olin⁶, R D Page³, A Povilus², F Robicheaux⁹, E Sarid¹⁰, D M Silveira⁴, J W Storey⁶, R I Thompson⁸, D P van der Werf⁵, J S Wurtele² and Y Yamazaki¹¹
¹ Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
² Department of Physics, University of California at Berkeley, Berkeley, CA 94720-7300, USA
³ Department of Physics, University of Liverpool, Liverpool L69 7ZE, UK
⁴ Instituto de Física, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-972, Brazil
⁵ Department of Physics, University of Wales Swansea, Swansea SA2 8PP, UK
⁶ TRIUMF, 4004 Wesbrook Mall, Vancouver BC V6T 2A3, Canada
⁷ Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
⁸ Department of Physics and Astronomy, University of Calgary, Calgary AB T2N 1N4, Canada
⁹ Department of Physics, Auburn University, Auburn, AL 36849-5311, USA
¹⁰ Department of Physics, NRCN-Nuclear Research Center Negev, Beer Sheva, IL-84190, Israel
¹¹ Atomic Physics Laboratory, RIKEN, Saitama 351-0198, Japan
¹² Permanent address: Department of Physics, University of Wales Swansea, Swansea SA2 8PP, UK
¹³ Permanent address: Rafael, POB 2250, Haifa 31021, Israel
¹⁴ Permanent address: Physics Department, Technion, Haifa 32000, Israel

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 Antihydrogen Laser PHysics Apparatus (ALPHA) 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.

Print publication: Issue 1 (14 January 2008)
Received 6 October 2007, in final form 9 October 2007
Published 19 December 2007

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

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