Filtered and bare vacuum photodiode detectors for VUV monitoring of Tokamak plasmas

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Abstract
Describes the use of filtered and unfiltered or 'bare' vacuum photodiodes as broadband vacuum ultraviolet radiation detectors for Tokamak plasmas. Filtered vacuum photodiodes are currently being used in laser fusion research as a temperature diagnostic however, up to now only bare vacuum photodiodes have been used for monitoring Tokamak plasmas. The bare photodiodes have a broad response to VUV in the wavelength range from less than 100 AA to monitor selected wavelength ranges within this spectral region. The authors have used polypropylene filters to obtain a transmission in the wavelength range approx. 50-150 AA, and aluminium silicon alloy (Al:Si) foil filters for obtaining a transmission in the range approx. 150-750 AA. The results obtained with these three types of photodiodes on the Macrotor and Microtor Tokamaks are described.