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Cryostat for electron irradiation experiments in subcooled superfluid helium at 1.8K

✍ Scribed by K.-H. Greubel; E. Gmelin; M. Kienhöfer; J. Major

Book ID
104112453
Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
414 KB
Volume
34
Category
Article
ISSN
0011-2275

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✦ Synopsis

A cryostat for irradiation of solids with 3 MeV electrons at 1.8K is described. High cooling power and optimized heat transfer between sample and cryoliquid are provided by using a constant volume subcooled superfluid helium bath. Refrigeration to 1.8K is performed by precooling the helium in a heat exchanger and subsequent expansion in a Joule-Thomson valve in connection with a 2000m3/h pumping unit. The cold is transferred by a second heat exchanger to a separated superfluid helium bath filling the sample irradiation cell. Facilities for sample annealing in the range from 1.8 K to 350 K are integrated. The flexibility of the system allows us to perform a variety of experiments by means of interchangeable sample holders.

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