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Snider, R.; Evanko, R.; Haskovec, J.
General Atomics Co., San Diego, CA (USA)1988
General Atomics Co., San Diego, CA (USA)1988
AbstractAbstract
[en] A toroidal soft x-ray imaging system is being added to the currently installed poloidal soft x-ray system on the DII-D tokamak. The poloidal array is used to determine the poloidal mode structure and location of internal helical MHD perturbations in the plasma. The new array will add toroidal mode identification capability. The four detector arrays are toroidally spaced in a manner which allows identification of toroidal mode numbers of up to 24. Beryllium vacuum windows separate the detectors from the tokamak vacuum and also serve as low energy filters. The separate detector vacuum chambers can be filled with a gas which changes the low energy cutoff of the system. By proper selection of the gas and pressure the low energy cutoff can be chosen over the entire range of the detector sensitivity (500 eV-1200 eV). This capability can be used to produce crude x-ray spectra for the entire imaging system or for gain control
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Feb 1988; 14 p; 7. topical conference on high temperature plasma diagnostics; Napa, CA (USA); 13-17 Mar 1988; CONF-880364--23; Available from NTIS, PC A03/MF A01; 1 as DE88010585
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