Abstract
A cryostat for irradiation of solids with 3 MeV electrons at 1.8K is described. Highcooling 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 2000m 3/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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