Design and initial operation of multichord soft x-ray detection arrays on the STOR-M tokamak.
Two miniature pinhole camera arrays for spatially and temporally resolved measurements of soft x-ray emission have been designed and installed on the STOR-M tokamak. Each array consists of a photodiode array, with one array viewing vertically and one viewing horizontally through a plasma cross section. Preamplifiers with fixed gains of 10(5) VA and custom built amplifiers with variable gains are used for signal amplification. Digitizers with 14 bit resolution and 3 MSs sampling rate are used for data acquisition. In the initial operation, an Al foil with a thickness of 1.8 microm installed for one array and Be filter of 7.6 microm installed for the other array are used to test signal strength. Initial tests have identified sawtooth oscillations and 20 kHz fluctuations, which are also detected by Mirnov coils, superimposed on the sawtooth oscillations.
Xiao
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Plasma Physics Laboratory, University of Saskatchewan, Saskatoon SK S7N 5E2, Canada. chijin.xiao@usask.ca
Niu
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T
Morelli
J E
JE
Paz-Soldan
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C
Dreval
M
M
Elgriw
S
S
Pant
A
A
Rohraff
D
D
Trembach
D
D
Hirose
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A