The results of the first experimental series to produce a plasma using the ion cyclotron range of frequency (ICRF) in the large helical device (LHD) within the minority scenario developed at Uragan-2M (U-2M) are presented. The motivation of this study is to provide plasma creation in conditions when an electron cyclotron resonance heating start-up is not possible, and in this way widen the operational frame of helical machines. The major constraint of the experiments is the low RF power to reduce the possibility of arcing. No dangerous voltage increase at the radio-frequency (RF) system elements and no arcing has been detected. As a result, a low plasma density is obtained and the antenna-plasma coupling is not optimal. However, such plasmas are sufficient to be used as targets for further neutral beam injection (NBI) heating. This will open possibilities to explore new regimes of operation at LHD and Wendelstein 7-X (W7-X) stellarator. The successful RF plasma production in LHD in this experimental series stimulates the planning of further studies of ICRF plasma production aimed at increasing plasma density and temperature within the ICRF minority scenario as well as investigating the plasma prolongation by NBI heating.
大型螺旋装置（LHD）中利用离子回旋频率范围（ICRF）在Uragan-2M（U-2M）上开发的少数载流子情景下产生等离子体的首次实验系列结果被呈现。本研究的动机是在电子回旋共振加热启动不可行的情况下提供等离子体产生，从而拓宽螺旋装置的工作范围。实验的主要约束是低射频功率以降低电弧放电的可能性。在射频系统元件上未检测到危险的电压升高，也未检测到电弧放电。结果，获得了低等离子体密度，且天线与等离子体之间的耦合并非最优。然而，此类等离子体足以用作进一步中性束注入（NBI）加热的靶等离子体。这将为探索LHD和Wendelstein 7-X（W7-X）仿星器的新运行模式开辟可能性。本实验系列中LHD上成功的射频等离子体产生，激励了进一步研究ICRF等离子体产生的计划，旨在提高ICRF少数载流子情景下的等离子体密度和温度，并研究通过NBI加热延长等离子体持续时间。