Studies on High-Density Helicon Wave Plasmas in Toroidal Magnetic Field

环形磁场中高密度螺旋波等离子体的研究

• 批准号: 13680563
• 负责人: MORIMOTO Shigeyuki
• 金额: $ 1.66万
• 依托单位: Kanazawa Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13680563/
• 关键词: RF heating Plasma; Helicon Wave; Toroidal Device; Helical Field; Heliotron; Toroidal Plasma; High-Density Plasma; RF Discharge; 高周波放電; ヘリコン波プラズマ; 磁気面

High-density (n_e> 10^<18> m\<-3>) argon plasmas have been produced with RF power off =13.6 MHz and P<10 kW in a toroidal helical device, Heliotron DR (major and minor radii are 0.9 m and 0.11 m, respectively). An elliptical loop antenna is used to excite helicon waves in the toroidal vacuum vessel. Two types of matching circuits have been examined, the RF antenna is electrically (a) grounded or (2) floated from the vacuum vessel. The toroidal magnetic field is 50G-900G and filling gas pressure is 2x10^<-5> Torr -5x10^<-3> Torr. To investigate plasma performance, two electrostatic and one magnetic probes are installed around the torus. When the antenna is floated from the vacuum vessel, the discharge changes from low-density to high-density mode as the RF power and/or gas pressure are increased. At the present input power level of about 6 kW, the toroidally uniform plasmas with n_e= 2x10^<18>m^<-3> are produced. If the gas pressure is increased further high-density plasmas with n_e > 10^<19> m^<-3> are obtained but they are localized near the antenna and not uniform around the torus. Such a non-uniformity in the toroidal direction will be solved by increasing the RF input power.

高密度 (n_e> 10^<18> m\<-3>) 氩等离子体已在环形螺旋装置 Heliotron DR（主半径和副半径分别为 0.9 m 和 0.11 m）中产生，RF 功率关闭 = 13.6 MHz 且 P<10 kW。椭圆环形天线用于在环形真空容器中激发螺旋波。已经检查了两种类型的匹配电路，射频天线在电气上 (a) 接地或 (2) 从真空容器浮出。环形磁场为50G-900G，填充气体压力为2x10^<-5>Torr -5x10^<-3>Torr。为了研究等离子体性能，在环面周围安装了两个静电探针和一个磁探针。当天线从真空容器浮起时，随着射频功率和/或气压的增加，放电从低密度模式变为高密度模式。在目前约6kW的输入功率水平下，产生n_e＝2x10^<18>m^-3>的环形均匀等离子体。如果气压进一步增加，则获得n_e > 10^<19>m^-3>的高密度等离子体，但它们局限于天线附近并且在环面周围不均匀。环形方向上的这种不均匀性将通过增加射频输入功率来解决。

项目成果

S.Morimoto: "Characteristics of the Toroidal RF Plasmas in Heliotron DR"Proceedings of the 26^<th> International Conference on Phenomena in Ionized Gases. 63-64 (2003)

S.Morimoto：“Heliotron DR 中环形射频等离子体的特征”第 26 届国际电离气体现象会议论文集。

S.Morimoto: "Production of Helicon Wave Plasmas in Heliotron Magnetic Field"11^<th> International Congress on Plasma Physics : ICPP2002. 30-33 (2003)

S.Morimoto：“日光管磁场中螺旋波等离子体的产生”第 11 届国际等离子体物理大会：ICPP2002。

S.Morimoto: "Characteristics of the Toroidal RF Plasmas in Heliotron DR"Proceedings of 26^<th> International Conference on Phenomena in Ionized Gases. 1. 63-64 (2003)

S.Morimoto：“Heliotron DR 中环形射频等离子体的特征”第 26 届国际电离气体现象会议论文集。

S.Morimoto: "Characteristics of the Toroidal RE Plasmas in Heliotron DR"Proceedings of the 26^<th> International Conference on Phenomena in Ionized Gases. 63-64 (2003)

S.Morimoto：“Heliotron DR 中环形 RE 等离子体的特征”第 26 届国际电离气体现象会议论文集。

S.Morimoto: "Production of Helicon Wave Plasmas in Heliotron Magnetic Field"Proceedings of the 11^<th> International Congress on Plasma Physics.

S.Morimoto：“日射管磁场中螺旋波等离子体的产生”第 11 届国际等离子体物理学大会论文集。