Year: 2022
Type: article
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.
Source: Review of Scientific Instruments
DOI: 10.1063/5.0070037
Institutions: P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Austrian Academy of Sciences, University of Turku, ETH Zurich, Stefan Meyer Institute for Subatomic Physics, Institute for Particle Physics and Astrophysics, Institut Laue-Langevin, Centre National de la Recherche Scientifique, Collège de France, Laboratoire Kastler Brossel, École Normale Supérieure - PSL, Sorbonne Université
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: Academy of Finland
Award: G449233951
OpenAlex ID: W3194513381