Numerical study of different electron density observed in Hydrogen and Deuterium ion source plasmas
Numerical study of different electron density observed in Hydrogen and Deuterium ion source plasmas
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氢和氘离子源等离子体中观察到的不同电子密度的数值研究
DOI：
10.1088/1742-6596/2244/1/012002
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
and A Hatayama
中科院分区：
文献类型：
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作者：
T Shibata;R Kato;H Nakano;K Hayashi;J Sato;K Miyamoto,K Hoshino;and A Hatayama
利用NIFS研究与开发负离子源（RNIS）进行了氢（H）和氘（D）的一系列实验，用于氘NBI的开发。在实验中，与负离子的共同提取的电子电流和等离子体产生区域中的电子密度在D实验中比在H实验中高约三倍。为了解释RNIS驱动区电子密度的差异，本文建立了一个零维数值模型。该模型只考虑了电子基态分子振动激发能级的同位素效应及其相应的截面。计算结果表明，通过分子振动激发态的电离通道数的差异可能是D等离子体中电离率提高的原因。
Sequences of hydrogen (H) and deuterium (D) experiments have been done by NIFS research and development negative ion source (RNIS) for the deuterium NBI development. In the experiments, the co-extracted electron current with the negative ions and the electron density in the plasma generation region in the D experiment have been around three times higher than that in the H experiment. To explain the difference of the electron density in the RNIS driver region, a zero-dimensional numerical model is developed in the present study. The model only focuses on the isotope effect for vibrationally excited level of electronically grounded state molecules and its relevant cross-sections. The calculation results show that difference of the ionization channel numbers via molecular vibrationally excited states could be a reason to enhance ionization rate in D plasma.