A large octupole magnetic trap for research with atomic hydrogen

Abstract

We describe the design and performance of a large magnetic trap for storing 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 towards 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 liters for hydrogen gas at 50 mK. This is an order of magnitude larger than ever used for trapping atoms.

References in corpus (2)

• Bose-Einstein Condensation of Atomic Hydrogen
• Two-Symmetry Penning-Ioffe Trap for Antihydrogen Cooling and Spectroscopy

Cited by in corpus (4)

• CPT and Lorentz symmetry tests with hydrogen using a novel in-beam hyperfine spectroscopy method applicable to antihydrogen experiments
• Performance Bounds of Magnetic Traps for Neutral Particles
• Adaptable platform for trapped cold electrons, hydrogen and lithium anions and cations
• Quasi-analytical lineshape for the 1S-2S laser spectroscopy of antihydrogen and hydrogen