A FAST BOLOMETER FOR THE WVII-AS STELLARATOR
A fast germanium bolometer for plasma diagnostics in the WVII-AS advanced stellarator is described. A stainless-steel foil is used as absorber, and germanium as thermally sensitive material. Short response time and high sensitivity of the bolometer were achieved using a 1.6 mum MgO layer as insulation between the germanium and the SS foil and by doping the germanium with oxygen, respectively. An overall heat capacity C-"rm bol" = 2.1 mJ/K and a temperature coefficient alpha of the germanium of "alpha" equiv ""Delta R/R"over"Delta T"" simeq 4%/K were thus obtained. The thermal response time is tau-"rm r" approx 10 mus and the decay time tau-"rm d" approx 1 s. Two 30- channel cameras for diagnostics in WVII-AS are to be equipped with the bolometers.
Bibliographic Reference: WRITE TO MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, 8046 GARCHING BEI MUENCHEN (GERMANY), MENTIONING REPORT IPP 2/291, 1988
Record Number: 1989126104600 / Last updated on: 1989-06-01
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