Possible effects of RF field near ICRF antenna on density control during long pulse discharge in LHD
Possible effects of RF field near ICRF antenna on density control during long pulse discharge in LHD
复制标题
ICRF 天线附近的 RF 场对 LHD 长脉冲放电期间密度控制的可能影响
DOI：
10.1016/j.jnucmat.2004.10.140
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Zhao Yang
中科院分区：
文献类型：
--
作者：
K. Saito;R. Kumazawa;T. Mutoh;T. Seki;T. Watari;Y. Nakamura;M. Sakamoto;N. Noda;Tsuguhiro Watanabe;M. Shoji;S. Masuzaki;S. Morita;M. Goto;Y. Torii;N. Takeuchi;F. Shimpo;G. Nomura;M. Yokota;A. Kato;Zhao Yang
在大型螺旋装置（LHD）中，通过离子回旋加速器频率范围（ICRF）加热，等离子体持续时间延长至150秒。时间积分总输入功率达到71MJ。然而，由于伴随电子密度增加的辐射崩塌，该放电终止。偏滤器板的温度和 Hα 的强度在靠近 ICRF 天线的同一环形部分中局部增加。辐射功率增加的可能原因之一是偏滤器板的排气，该偏滤器板被天线附近的回旋加速器谐振层中加速的粒子加热。另一个可能的原因是由于高能粒子导致 ICRF 天线温度升高，或者 RF（射频）护套的形成，导致 ICRF 天线本身放气。
In the large helical device (LHD), the plasma duration time was extended up to 150s by ion cyclotron range of frequencies (ICRF) heating. Time-integrated total input power reached 71MJ. However, this discharge terminated due to radiation collapse accompanied by an increase of electron density. The temperature of the divertor plates and the intensity of Hαwere locally increased in the same toroidal section, near the ICRF antenna. One of the possible causes of the increase of radiation power is an outgassing from the divertor plates that were heated by particles accelerated in the cyclotron resonance layer near the antenna. Another possible cause is the outgassing from the ICRF antenna itself due to a temperature increase of the ICRF antenna owing to high-energy particles, or the formation of an RF (radio frequency) sheath.