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Dilution refrigerator for muon spin relaxation experiments (1986)

Cooke, D. W. ; Hoffer, J. K. ; Maez, M. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 57 (1986), S. 336-340

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: The design, construction, and operational characteristics of a continuous 3He–4He dilution refrigerator specifically built for use in muon spin relaxation ( μSR) measurements at LAMPF are described in this paper. The refrigerator is unique in that it makes an angle of 30° with respect to horizontal—a requirement imposed by the previously existing physical constraints of the μSR spectrometer. Additionally, the refrigerator and associated gas handling units are portable so as to facilitate ease of movement into and out of the muon beam. Typical parameters describing refrigerator performance are 60-mK base temperature with 22-μW cooling capacity at 100 mK.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1138941

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Digitale Medien

Nuclear alignment in a Kondo system as a very low temperature thermometer (1969)

Pratt, W. P. ; Schermer, R. I. ; Steyert, W. A.

Springer

Journal of low temperature physics 1 (1969), S. 469-476

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ISSN: 1573-7357

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Cu doped with less than 1 ppm Mn54 appears to offer a number of advantages as a γ-ray anisotropy thermometer in the temperature range 1 to 20 mK. In order to use such a thermometer it is necessary to know how the hyperfine field at the Mn54 nuclei varies with temperature and with applied field. We have studied this γ-ray anisotropy and find that the hyperfine field is independent of temperature in the range 4 mK 〈T〈10 mK. Further, we have determined the hyperfine field to ±5% as a function of applied field in the range 60 Oe〈H a〈1200 Oe. The latter data may be used to determine a Kondo temperature of 64±2 mK for this system.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00628210

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54Mn in Fe for ultralow temperature thermometry (1971)

Sites, James R. ; Smith, H. A. ; Steyert, W. A.

Springer

Journal of low temperature physics 4 (1971), S. 605-614

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ISSN: 1573-7357

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Experimental investigations into the accuracy of nuclear orientation thermometry are reported.54Mn in iron, a primary thermometer useful from 2–40 mK, gives consistent thermometry using both scintillation (3×3 in.-NaI) and solid-state (40-cc-Ge) detectors.60Co-in-iron temperatures are consistent with the54Mn temperatures above 10 mK, but are about 10% higher at 4 mK.125Sb in iron registers a temperature that is perhaps 2 or 3% lower over the 4–15 mK region. Some of the techniques required for the utilization of this type of thermometry are discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00628296

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