Abstract

A gas of hydrogen atoms, confined in a static magnetic trap, has been evaporatively cooled to temperatures of a few millikelvin. The initial trap configuration held the gas at 38 mK for as long as 5 h. Evaporative cooling reduced the temperature to 3.0 mK while maintaining the central density at 7.6\ifmmode\times\else\texttimes\fi{}${10}^{12}$ ${\mathrm{cm}}^{\ensuremath{-}3}$. These values were determined by measurement of the rate of electronic spin relaxation and are in agreement with model calculations. Further cooling to 1 mK (inferred from the model) has been achieved. Measurements were made of the efficiency of the evaporative cooling process.

Keywords

Evaporative coolerHydrogenAtomic physicsMagnetic trapMaterials scienceTrap (plumbing)Relaxation (psychology)Spin (aerodynamics)Condensed matter physicsPhysicsThermodynamicsNuclear physicsPlasmaMeteorology

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Publication Info

Year
1988
Type
article
Volume
61
Issue
8
Pages
935-938
Citations
242
Access
Closed

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Cite This

N. Masuhara, John M. Doyle, Jon C. Sandberg et al. (1988). Evaporative Cooling of Spin-Polarized Atomic Hydrogen. Physical Review Letters , 61 (8) , 935-938. https://doi.org/10.1103/physrevlett.61.935

Identifiers

DOI
10.1103/physrevlett.61.935