Camera for imaging hard x rays from suprathermal electrons during lower hybrid current drive on PBX‐M
作者:
S. von Goeler,
S. Jones,
R. Kaita,
S. Bernabei,
W. Davis,
H. Fishman,
G. Gettelfinger,
D. Ignat,
F. Paoletti,
G. Petravich,
F. Rimini,
P. Roney,
J. Stevens,
W. Stodiek,
期刊:
Review of Scientific Instruments
(AIP Available online 1994)
卷期:
Volume 65,
issue 5
页码: 1621-1630
ISSN:0034-6748
年代: 1994
DOI:10.1063/1.1144850
出版商: AIP
数据来源: AIP
摘要:
During lower hybrid current drive on tokamaks, suprathermal electrons are generated that emit hard x‐ray bremsstrahlung. A pinhole camera has been installed on the PBX‐M tokamak that records 128×128 pixel images of the hard x‐ray plasma bremsstrahlung emitted in the 30–200 keV photon energy range. The camera has a temporal resolution of 3 ms and a spatial resolution of 3–4 cm in the plasma. The detector is a 230‐mm‐diam hard x‐ray image intensifier. This instrument has identified hollow radiation profiles on PBX‐M, indicating off‐axis current drive. A detailed account of the construction of the hard x‐ray camera, its operation, and its performance is given.
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