Multi-point Thomson scattering. Report No. 86
Technical Report
·
OSTI ID:5326066
A new detector system for single shot measurement of electron temperature and density profiles in a magnetically confined plasma has been developed. Preliminary results have been obtained with this multi-point Thomson scattering diagnostic on Torus II, a high beta tokamak. It has a density range of 2 x 10/sup 13/cm/sup -3/ less than or equal to n/sub e/ less than or equal to 5 x 10/sup 14/cm/sup -3/ in the preionization phase and density of 5 x 10/sup 14/cm/sup -3/ less than or equal to n/sub e/ less than or equal to 2 x 10/sup 15/cm/sup -3/ in the tokamak phase. Electron temperatures range from T/sub e/ > 6 eV in the preionization phase to T/sub e/ approx. 100 eV in the tokamak phase. The detector used is a multi-anode microchannel plate (MCP) with a 25 mm diameter multi-alkali photocathode. A 10 x 10 array of anodes collect the current, which has been amplified by as much as 10/sup 6/. Each anode is independent so the MCP can be viewed as a parallel array of 100 independent photomultiplier tubes.
- Research Organization:
- Columbia Univ., New York (USA). Plasma Physics Lab.
- DOE Contract Number:
- AS02-76ET53016
- OSTI ID:
- 5326066
- Report Number(s):
- DOE/ET/53016-77; ON: DE82014385
- Country of Publication:
- United States
- Language:
- English
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