Plasma wall interaction in long-pulse helium discharge in LHD - Microscopic modification of the wall surface and its impact on particle balance and impurity generation
Plasma wall interaction in long-pulse helium discharge in LHD - Microscopic modification of the wall surface and its impact on particle balance and impurity generation
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DOI：
10.1016/j.jnucmat.2014.12.062
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发表时间：
2015-08-01
影响因子：
3.1
通讯作者：
Nagata, S.
中科院分区：
文献类型：
--
作者：
Tokitani, M.;Kasahara, H.;Nagata, S.
在大螺旋装置（LHD）中的具有离子和电子回旋加热（ICH + ECH）的超长脉冲氦放电在48分钟等离子体（n（e）类似于1.2 × 10（19）m（-3），T-i，T-e类似于2 keV）中实现，平均加热功率为1.2 MW。放电过程中的第一壁表面的温度保持在接近室温。然而，即使在超长脉冲氦放电中，放电条件也不能说处于稳态，因为两个主要问题中断了稳态条件。一个是“壁面抽运率的动态变化”，另一个是“放电终止，混合材料沉积层剥落”。“微观修改，如氦辐射损伤和形成的混合材料沉积层组成的C（类似于98%）和铁（类似于2%），对等离子体面临的组件（PFMs）进行了澄清，可能会影响主要问题。(C)2014爱思唯尔有限公司版权所有。
Ultra-long-pulse helium discharge with ion and electron cyclotron heating (ICH + ECH) in the Large Helical Device (LHD) was achieved in a 48 min plasma (n(e) similar to 1.2 x 10(19) m(-3), T-i,T-e similar to 2 keV) with an average heating power of 1.2 MW. The temperature of the first-wall surface during discharges remained at nearly room temperature. However, even in ultra-long-pulse helium discharge, the discharge conditions cannot be said to be in a steady-state, because of two major issues interrupting the steady-state condition. One is the "dynamic change of the wall pumping rate" and the other is the "termination of the discharge with the exfoliation of the mixed-material deposition layers." Microscopic modifications, such as helium radiation damage and the formation of the mixed-material deposition layers composed of C (similar to 98%) and Fe (similar to 2%), on the plasma facing components (PFMs) were clarified to possibly influence the major issues. (C) 2014 Elsevier B.V. All rights reserved.