Development of the Thomson scattering method for measuring the evolution of the electron temperature in the FT-1 tokamak
In order to study the dynamics of ECR heating in the FT-1 tokamak an unconventional Thomson diagnostic scheme has been developed which includes a multipulse ruby laser and a multipass plasma probe system. The laser is operated in the multipulse regime (4-6 pulses with an overall energy of 10-15 J in the course of 1 ms) by means of passive gating in the laser cavity. The use of a multipass probe system permits the energy of the radiation scattered in the plasma to be increased by more than a factor of ten and allows high accuracy in the measurements of the electron temperature ({approximately} 6% when the electron density is 10{sup 13} cm{sup {minus}3} after one laser pulse with energy 3 J). The behavior of the electron temperature has been investigated for various types of microwave power input into the plasma. The Thomson diagnostic data permit the profiles of the microwave power absorbed by the electrons to be determined. 1 ref., 6 figs.
- OSTI ID:
- 416262
- Journal Information:
- Soviet Journal of Plasma Physics, Vol. 18, Issue 2; Other Information: PBD: Feb 1992; TN: Translated from Fiz. Plazmy; 18: No. 2, 166-169(Feb 1992)
- Country of Publication:
- United States
- Language:
- English
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