A novel CO2 laser-based tangential imaging diagnostic was completely calibrated and the system was tested on CDX-U plasmas. It was shown that localized, two-dimensional images of the plasma electron density fluctuations in the tokamak core can be obtained from a tangential imaging beam [E. Lo, J. Wright, and R. Nazikian, Rev. Sci. Instrum. 66, 1180 (1995)]. A variation of the Zernike phase mirror is used. Test measurements made on sound waves verify that the system will image phase variations placed at the object plane. An absolute sensitivity of ≈1×107 was determined. A series of plasma measurements made on CDX-U is described. Results show that the plasma fluctuations are two to three orders of magnitude above the noise floor of the diagnostic. It is also verified that a high-pass cut-off wave number (from ≈1 to 8 cm−1) for the fluctuations can be selected by translating the phase mirror. The density fluctuation k spectrum is measured and found to peak at ≈1–3 cm−1.
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February 1997
Proceedings of the eleventh topical conference on high temperature plasma diagnostics
12-16 May 1996
Monterey, California (USA)
Research Article|
February 01 1997
Calibration and test of the tangential phase contrast imaging diagnostic on CDX-U
E. Lo;
E. Lo
Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543-0451
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R. Nazikian;
R. Nazikian
Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543-0451
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D. Stutman;
D. Stutman
Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543-0451
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W. Choe;
W. Choe
Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543-0451
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R. Kaita
R. Kaita
Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543-0451
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E. Lo
R. Nazikian
D. Stutman
W. Choe
R. Kaita
Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543-0451
Rev. Sci. Instrum. 68, 1206–1216 (1997)
Article history
Received:
May 14 1996
Accepted:
June 14 1996
Citation
E. Lo, R. Nazikian, D. Stutman, W. Choe, R. Kaita; Calibration and test of the tangential phase contrast imaging diagnostic on CDX-U. Rev. Sci. Instrum. 1 February 1997; 68 (2): 1206–1216. https://doi.org/10.1063/1.1147883
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