✦ LIBER ✦

Fast negative ion thermometer for 3He superfluids

✍ Scribed by J.T. Simola; K.K. Nummila; L. Skrbek; J.S. Korhonen

Publisher: Elsevier Science
Year: 1987
Tongue: English
Weight: 563 KB
Volume: 27
Category: Article
ISSN: 0011-2275
DOI: 10.1016/0011-2275(87)90210-4

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✦ Synopsis

A thermometer based on the temperature dependence of the negative ion mobility in superfluid 3He is described. The device can be used for monitoring the temperature of an open geometry sample of 3He in the range 0.4 < T/Tc -< 1. The ion thermometer is most sensitive immediately below Tc, in the Ginzburg-Landau region; above T = 0.95Tc a resolution of 0.1 I~K can be achieved. The measuring technique provides an on-line display of the relative mobility, I~(T)/I~(Tc), and the ions probe the temperature of the 3He sample directly, which leads to a short time constant x < 10 s. The relative mobility versus T/Tc is insensitive to the external magnetic field and the pressure of the sample. Only a low electric field, E < 10 V cm -1, with essentially no homogeneity requirements is needed. Parasitic heating due to the flow of ions is of the order of 1 pW.

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