DESIGN OF A FOUR-CHANNEL BOLOMETER MODULE FOR ASDEX-UPGRADE AND TORE-SUPRA
A new small-sized four-bolometer module for application in high-temperature plasma diagnostics has been designed. The four bolometer MODULE and the four reference bolometers shielded against radiation are placed side by side on one kapton foil, the entire arrangement occupying an area of 2.0 x 3.3 cm**2. The central part of each bolometer consists of a 1.5 x 4 mm**2 large, 4 to 15 mum thick kapton carrier foil, and a 0.05 mum thick meander-like gold resistor (conducting path width: 30 mum). It offers all advantages already provided by the well-known ASDEX and JET bolometers, such as very high operating reliability and resistance to nuclear radiation damage. It is optional to enlarge the cooling time constant of the bolometer in a controlled way from milliseconds up to several hundreds, thus improving the sensitivity to very weak signals in the low frequency (<or=20 Hz) part of the radiation spectrum, by means of an additional (thin) gold layer that delays the heat losses from the bolometer to the cooling body. Since the bolometer is very suitable for AC bridge electronics and all bridge resistors are arranged on a minimum area interference signals should be suppressed to extremely low levels.
Bibliographic Reference: WRITE TO MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, 8046 GARCHING BEI MUENCHEN (GERMANY), MENTIONING REPORT IPP 1/224, 1985
Record Number: 1989124092800 / Last updated on: 1987-01-01
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