Evaporative cooling of spin-polarized atomic hydrogen

A gas 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 x...

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Veröffentlicht in:	Phys. Rev. Lett.; (United States) 1988-08, Vol.61 (8), p.935-938
Hauptverfasser:	MASUHARA, N, DOYLE, J. M, SANDBERG, J. C, KLEPPNER, D, GREYTAK, T. J, HESS, H. F, KOCHANSKI, G. P
Format:	Artikel
Sprache:	eng
Schlagworte:	ATOMIC AND MOLECULAR PHYSICS Atomic properties and interactions with photons ATOMS COOLING DENSITY ELEMENTS EVAPORATIVE COOLING Exact sciences and technology HYDROGEN HYPERFINE STRUCTURE MAGNETIC FIELDS NONMETALS ORIENTATION Photon interactions with atoms PHYSICAL PROPERTIES 640302 > Atomic, Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory Physics RELAXATION SPIN ORIENTATION TRAPPING ULTRALOW TEMPERATURE
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Zusammenfassung:	A gas 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 x 10/sup 12/ cm/sup -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.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.61.935