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Thomson scattering has been used in a proof-of-principle experiment to measure poloidal current density in the HBTX reversed field pinch plasma. Light scattered from an off-axis location was collected simultaneously in the +90 and -90 directions, and dispersed in each of two spectrometers into two wavebands. From the resulting intensity ratios, electron temperature and poloidal drift velocity were computed. Reversing the poloidal current resulted in a reversal of the measured direction of the drift velocity. Rayleigh scattering calibration permitted the local n(e) to be determined and the poloidal current density to be calculated.

Additional information

Authors: EVANS D E, UKAEA, Culham Laboratory, Abingdon (GB);WILCOCK P D, UKAEA, Culham Laboratory, Abingdon (GB);MITCHELL I H, Imperial College, University of London (GB)
Bibliographic Reference: Report: CLM-P877 EN (1989) 6 pp.
Availability: Available from the Librarian, UKAEA, Culham Laboratory, Abingdon, Oxon. OX14 3DB (GB)
Record Number: 199011405 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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