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Authors Yamada I, Narihara K, Funaba H, Hayashi H, Kohmoto T, Takahashi H, Shimozuma T, Kubo S, Yoshimura Y, Igami H, Tamura N
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Journal Rev Sci Instrum Volume: 81 Issue: 10 Pages: 10D522
Publish Date 2010 Oct
PubMed ID 21033877

In Large Helical Device (LHD) experiments, an electron temperature (T(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(e)≤10 keV, the data quality becomes worse in the higher T(e) region exceeding 10 keV. In order to accurately determine T(e) in the LHD high-T(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(e). Another signal accumulation method was also tested. In addition, we estimated the influence of high-energy electrons on T(e) obtained by the LHD Thomson scattering system. Copyright © 2016 The Board of Regents of the University of Wisconsin System