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laser in JT-60UKondoh, Takashi; Lee, S.; Miura, Yukitoshi
Proceedings of 10th International Symposium on Laser-Aided Plasma Diagnostics, p.109 - 114, 2001/00
A collective Thomson scattering (CTS) diagnostic system based on a CO laser has come into operation to establish measurement technique of ion temperature and fast alpha particle in fusion plasmas. A pulsed CO2 laser (wavelength 10.6
m, beam energy 15 J, pulse width 1s) and a heterodyne receiver were developed by Oak Ridge National Laboratory (ORNL) and were installed in the JT-60U tokamak. Commissioning of the CTS system by injecting the CO laser into the plasmas has been proceeded.
Hatae, Takaki; Naito, Osamu
Proceedings of 10th International Symposium on Laser-Aided Plasma Diagnostics, p.160 - 166, 2001/00
In recent strong electron heating experiments in JT-60U, it seems that central 
rises above 
15 keV which is measured by Ruby laser and YAG laser Thomson scattering systems. However, error bars are relatively large and it is difficult to measure the very high beyond 15 keV with high accuracy because the electron temperature region exceeds that of the original design. To improve the measurement performance in very high , we have tried the combination of existing Ruby laser system and YAG laser system. From simulations, it was found that (1) changing the form of the spectrum with the other laser is an effective way for very high measurement, (2) furthermore the combined system in YAG laser scattering is well optimized at 20keV and relative error is reduced significantly compared with original system.