Improvements of data quality of the LHD Thomson scattering diagnostics in high-temperature plasma experiments
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292 (Japan)
- Department of Energy Science and Technology, Nagoya University, Nagoya 464-8463 (Japan)
In Large Helical Device (LHD) experiments, an electron temperature (T{sub e}) more than 15 keV has been observed by the yttrium-aluminum-garnet (YAG) laser Thomson scattering diagnostic. Since the LHD Thomson scattering system has been optimized for the temperature region, 50 eV{<=}T{sub e}{<=}10 keV, the data quality becomes worse in the higher T{sub e} region exceeding 10 keV. In order to accurately determine T{sub e} in the LHD high-T{sub e} experiments, we tried to increase the laser pulse energy by simultaneously firing three lasers. The technique enables us to decrease the uncertainties in the measured T{sub e}. Another signal accumulation method was also tested. In addition, we estimated the influence of high-energy electrons on T{sub e} obtained by the LHD Thomson scattering system.
- OSTI ID:
- 22055783
- Journal Information:
- Review of Scientific Instruments, Vol. 81, Issue 10; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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