The ATHENA positron accumulator

A positron accumulator has been constructed for use in the ATHENA anti-hydrogen experiment in CERN. Employing a solid neon moderator plated on to a 50 mCi 22 Na source, a low energy beam of 7×10 6 positrons/s is guided into a 0.14 T magnetic field where they are trapped and cooled down to room tempe...

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Bibliographic Details
Published in:Applied surface science 2002-06, Vol.194 (1), p.312-316
Main Authors: van der Werf, D.P, Jørgensen, L.V, Watson, T.L, Charlton, M, Collier, M.J.T, Doser, M, Funakoshi, R
Format: Article
Language:English
Subjects:
Anti-hydrogen
Cyclic accelerators and storage rings
Exact sciences and technology
Experimental methods and instrumentation for elementary-particle and nuclear physics
Moderator
Nuclear physics
Physics
Positron traps
Storage rings
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Summary:A positron accumulator has been constructed for use in the ATHENA anti-hydrogen experiment in CERN. Employing a solid neon moderator plated on to a 50 mCi 22 Na source, a low energy beam of 7×10 6 positrons/s is guided into a 0.14 T magnetic field where they are trapped and cooled down to room temperature using nitrogen as a buffer gas. Plasmas of up to 2×10 8 positrons in 450 s, with an FWHM of 4 mm after compressing with the rotating electrical wall technique have been observed. In order to transfer the plasma to the main ATHENA (3 T) magnet, where the recombination trap is situated, a transfer section has been constructed consisting of a valve and a pulsed magnet with a pumping restriction inside. This magnet pulses to 1.2 T during the transfer. Preliminary tests have yielded transfer efficiencies in the order of 50%.
ISSN:0169-4332
1873-5584
DOI:10.1016/S0169-4332(02)00141-1