Development of the plasma operational regime in the large helical device by the various wall conditioning methods
Development of the plasma operational regime in the large helical device by the various wall conditioning methods
复制标题
通过各种壁调节方法开发大型螺旋装置中的等离子体运行状态
DOI：
10.1016/j.jnucmat.2004.10.152
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发表时间：
2005
影响因子：
3.1
通讯作者：
O. Motojima
中科院分区：
文献类型：
--
作者：
K. Nishimura;N. Ashikawa;S. Masuzaki;J. Miyazawa;A. Sagara;M. Goto;B. Peterson;A. Komori;N. Noda;K. Ida;O. Kaneko;K. Kawahata;T. Kobuchi;S. Kubo;S. Morita;M. Osakabe;S. Sakakibara;R. Sakamoto;K. Sato;T. Shimozuma;Y. Takeiri;Kokichi Tanaka;O. Motojima
自1998年首次放电以来，一直在开展大型螺旋装置的实验。尝试在95°C下烘烤、电子回旋共振放电清洁、辉光放电清洁、钛吸杂和硼化用于壁调节。使用这些调节技术，氧化气体，如H2O，CO和CO2的分压逐渐降低，等离子体的操作制度扩大。用不同的工作气体，如氢气，氦气，氖和氩气，辉光放电清洗是有效的，在提高等离子体纯度。用这种方法得到了10keV的中心离子温度。从2001财政年度开始的硼化也有效地减少了杂质的辐射损失，扩大了密度操作范围。我们得到了等离子体的储存能量为1.31 MJ，电子密度为2.4×1020m−3。
Experiments in the large helical device have been developing since the first discharge in 1998. Baking at 95°C, electron cyclotron resonance discharge cleaning, glow discharge cleaning, titanium gettering and boronization were attempted for wall conditioning. Using these conditioning techniques, the partial pressures of the oxidized gases, such as H2O, CO and CO2, were reduced gradually and the plasma operational regime enlarged. The glow discharge cleaning with the various working gases, such as hydrogen, helium, neon and argon, was effective in increasing the plasma purity. By this method, we obtained a central ion temperature of 10keV. Boronization, which was started from FY2001, was also effective in reducing the radiation losses from impurities and in enlarging the density operational regime. We obtained a plasma stored energy of 1.31MJ and an electron density of 2.4×1020m−3.