Abstract
Positrons accumulated in a room-temperature buffer-gas-cooled positron accumulator are efficiently transferred into a superconducting solenoid which houses the ATRAP cryogenic Penning trap used in antihydrogen research. The positrons are guided along a 9m long magnetic guide that connects the central field lines of the 0.15 T field in the positron accumulator to the central magnetic field lines of the superconducting solenoid. Seventy independently controllable electromagnets are required to overcome the fringing field of the large-bore superconducting solenoid. The guide includes both a 15° upward bend and a 105° downward bend to account for the orthogonal orientation of the positron accumulator with respect to the cryogenic Penning trap. Low-energy positrons ejected from the accumulator follow the magnetic field lines within the guide and are transferred into the superconducting solenoid with nearly 100% efficiency. A 7m long 5 cm diameter stainless-steel tube and a 20mm long, 1.5mm diameter cryogenic pumping restriction ensure that the 10 -2 mbar pressure in the accumulator is isolated well from the extreme vacuum required in the Penning trap to allow for long antimatter storage times.
Original language | English (US) |
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Article number | 045006 |
Journal | New Journal of Physics |
Volume | 14 |
DOIs | |
State | Published - Apr 2012 |
ASJC Scopus subject areas
- Physics and Astronomy(all)