1. A large octupole magnetic trap for research with atomic hydrogen.
- Author
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Ahokas, J., Semakin, A., Järvinen, J., Hanski, O., Laptiyenko, A., Dvornichenko, V., Salonen, K., Burkley, Z., Crivelli, P., Golovizin, A., Nesvizhevsky, V., Nez, F., Yzombard, P., Widmann, E., and Vasiliev, S.
- Subjects
MAGNETIC traps ,ATOMIC hydrogen ,NUCLEAR research ,ATOM trapping ,MAGNETISM - Abstract
We describe the design and performance of a large magnetic trap for storage and cooling of atomic hydrogen (H). The trap operates in the vacuum space of a dilution refrigerator at a temperature of 1.5 K. Aiming at a large volume of the trap, we implemented the octupole configuration of linear currents (Ioffe bars) for the radial confinement, combined with two axial pinch coils and a 3 T solenoid for the cryogenic H dissociator. The octupole magnet consists of eight race-track segments, which are compressed toward each other with magnetic forces. This provides a mechanically stable and robust construction with a possibility of replacement or repair of each segment. A maximum trap depth of 0.54 K (0.8 T) was reached, corresponding to an effective volume of 0.5 l for hydrogen gas at 50 mK. This is an order of magnitude larger than ever used for trapping atoms. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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