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Abstract

Results are reported of an attempt to measure the ion temperature in the TCA tokamak by collective Thomson scattering of the radiation of an optically pumped D-20 far infrared laser. Consistent results are obtained in the correct range of temperatures. While the precision obtained so far is still unsatisfactory, there are no indications of any adverse effects precluding a precise measurement with a more sensitive state-of-the-art detection system. Time- and frequency resolved measurements of the far- infrared laser emission proved that the bandwidth and the frequency shift during the pulse (chirping) are still acceptable for a collective Thomson scattering experiment. During this study we showed that the emission frequency depends on the intensity of the pump and the FIR beam as well as on the D-20 pressure. We also observed an influence of the time history of the emission resulting in a doubly-peaked pulse shape of the FIR laser.

Additional information

Authors: SIEGRIST M R, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);BEHN R, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);DUPERTUIS M A, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);KRUG P A, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);KJELBERG I, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);SALITO S A CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND), CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND)
Bibliographic Reference: INTERNATIONAL CONFERENCE ON LASERS'87, LAKE TAHOE, NEVADA (USA), DEC. 7-11, 1987, AVAILABILITY: CEC-LUXEMBOURG, DG-XIII-C-3, POB 1907, MENTIONING PAPER EN 34076 ORA
Availability: Can be ordered online
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