高温等离子体实验中左旋极化器汤姆逊散射诊断数据质量的改进。

Improvements of data quality of the LHD Thomson scattering diagnostics in high-temperature plasma experiments.

作者信息

Yamada I, Narihara K, Funaba H, Hayashi H, Kohmoto T, Takahashi H, Shimozuma T, Kubo S, Yoshimura Y, Igami H, Tamura N

机构信息

National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan.

出版信息

Rev Sci Instrum. 2010 Oct;81(10):10D522. doi: 10.1063/1.3483189.

DOI:10.1063/1.3483189

PMID:21033877

Abstract

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.

摘要

在大型螺旋装置（LHD）实验中，通过钇铝石榴石（YAG）激光汤姆逊散射诊断观察到电子温度（T(e)）超过15keV。由于LHD汤姆逊散射系统已针对50 eV≤T(e)≤10 keV的温度区域进行了优化，在超过10 keV的较高T(e)区域数据质量会变差。为了在LHD高T(e)实验中准确测定T(e)，我们尝试通过同时发射三台激光器来增加激光脉冲能量。该技术使我们能够降低测量T(e)时的不确定性。还测试了另一种信号积累方法。此外，我们估计了高能电子对通过LHD汤姆逊散射系统获得的T(e)的影响。