Cavity Ring‐Down System for Density Measurement of Negative Hydrogen Ion on Negative Ion Source

Cavity Ring‐Down System for Density Measurement of Negative Hydrogen Ion on Negative Ion Source
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用于负离子源上负氢离子密度测量的腔体衰荡系统

DOI：
10.1063/1.3637406
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发表时间：
2011
期刊：
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影响因子：
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通讯作者：
Y. Takeiri
Y. Takeiri
中科院分区：
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文献类型：
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作者：
H. Nakano;K. Tsumori;K. Nagaoka;M. Shibuya;U. Fantz;M. Kisaki;K. Ikeda;M. Osakabe;O. Kaneko;E. Asano;T. Kondo;Mamoru Sato;S. Komada;H. Sekiguchi;Y. Takeiri

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为研制大螺旋装置中性束注入器，采用腔衰荡（CRD）系统测量了H−源引出面附近的负氢离子（H−）密度。进行了采样时间为50 ms的密度测量。使用CRD系统测量的密度与使用正离子源的类似关系从提取的束流评估的密度相对较好地一致。在离子源等离子体中接种铯时，观察到放电的电弧功率与CRD系统测量的密度之间的线性关系。此外，测得的密度与提取的束流成比例。这些特性表明CRD系统在H-和提取区域的H-密度测量中工作良好。
A Cavity Ring‐Down (CRD) system was applied to measure the density of negative hydrogen ion (H−) in vicinity of extraction surface in the H− source for the development of neutral beam injector on Large Helical Device (LHD). The density measurement with sampling time of 50 ms was carried out. The measured density with the CRD system is relatively good agreement with the density evaluated from extracted beam‐current with applying a similar relation of positive ion sources. In cesium seeded into ion‐source plasma, the linearity between an arc power of the discharge and the measured density with the CRD system was observed. Additionally, the measured density was proportional to the extracted beam current. These characteristics indicate the CRD system worked well for H− density measurement in the region of H− and extraction.