Abstract
This note describes an electronic circuit developed to provide power and temperature control for electron bombardment heating applications in ultrahigh vacuum. Salient features of the design include closed-loop feedback control based on a temperature sensing element and a configuration which is fail safe with respect to both short and open circuits in the temperature sensing device. This circuit has been used for control of a Knudsen cell in molecular beam studies and for heating a single crystal substrate in LEED-Auger spectroscopy studies.
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