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| P22 · CO2 Laser Collective Thomson scattering for Alpha-particle Diagnostics T. Kondoh, T. Hayashi, Y. Kawano, T. Sugie *, Y. Kusama, Y. Miura Japan Atomic Energy Agency, Naka, Ibaraki, 311-0193, Japan
Abstract: In JT-60U (JAEA Tokamak 60 - Upgrade), a collective Thomson scattering (CTS) technique based on a CO2 laser is being developed in order to establish a diagnostic method of confined alpha-particles in burning plasmas.
In order to the demonstrate feasibility of the CTS system, a new laser systems is being developed, with which
improved signal-to-Noise (S/N) ratio of a detection signal and temporal resolution will be obtained. The laser
has cavity length of ~ 4 m and has high repetition rate (10 Hz). To improve the spectral purity of the laser,
cavity length will be feedback-controlled and a spectral filter will be installed in the output of the laser.
Numerical calculation shows that ion temperature will be evaluated from the scattered spectrum with the new
CO2 laser.
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