Abstract
A versatile low-temperature apparatus for studies using ion beams in an ultrahigh vacuum environment is described. By providing variable-temperature operation from ∼2–300 K, the facility can be used for a variety of studies. These have included low-temperature ion implantations for the production of metastable superconducting systems, thermal-annealing studies, and ion-mixing experiments. The cryostat combines economical use of liquid helium, long-holding time (several days) at liquid–helium temperatures as required for some studies, and ion–beam accessibility with the capability of absorbing high power (∼∼6 W at 5 K) for short periods. To allow adjustment of the target position relative to implanting or analyzing ion beams, the entire cryostat is mounted on a separate assembly providing vertical motion and rotation about the vertical axis.
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