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首页> 外文期刊>Plasma physics and controlled fusion >Characterization of hydrogen plasma in a permanent ring magnet based helicon plasma source for negative ion source research
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Characterization of hydrogen plasma in a permanent ring magnet based helicon plasma source for negative ion source research

机译：基于永磁磁体的氢等离子体的氢等离子体的表征负离子源研究

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HELicon Experiment for Negative ion source (HELEN-I) with a single driver is developed with a focus on the production of negative hydrogen ions. In the Helicon wave heated plasmas, very high plasma densities (10(18)-10(19)m(-3)) can be attained with electron temperatures as low as similar to 1 eV in the downstream region. These conditions favor the production of negative hydrogen ions. In HELEN-I device at IPR, helicon plasma is produced using Hydrogen gas by applying a RF power (P-RF) of 800-1000 W at 13.56 MHz frequency. A Nagoya-III antenna is used to excite m = 1 helicon mode in the plasma. A permanent ring magnet creates the required axial magnetic field. The plasma is confined by a multi-cusp field configuration in the expansion chamber. The transition from inductively coupled mode to Helicon mode is observed near P-RF similar to 700 W with plasma density similar to 10(18)m(-3) and electron temperature 5 eV in the driver and similar to 1 eV in the expansion volume. Negative hydrogen ion density, averaged over the line of sight, is measured in the expansion chamber by employing an optical emission spectroscopy diagnostic technique using H-alpha/H-beta ratio and a laser photodetachment based cavity ring down spectroscopic diagnostic technique. The measured value of negative hydrogen ion density is in the order of 10(16)m(-3) at 6 m Torr pressure and does not vary significantly with power, pressure and downstream axial magnetic field variation in the helicon mode. The negative ion density measurements are compared with theoretically estimated values calculated using a particle balance method considering different reaction rates responsible for negative hydrogen ion creation and destruction. It is to be noted that, at present, cesium is not injected in the plasma discharge to enhance H- ion density.
机译：具有单个驾驶员的负离子源（Helen-I）的Helicon实验是开发的，专注于负氢离子的产生。在Helicon波加热等离子体中，非常高的等离子体密度（10（18）-10（19）m（-3））可以在下游区域中具有低于1eV的电气温度获得。这些条件有利于产生负氢离子。在IPR的Helen-I设备中，通过在13.56MHz频率下施加800-1000W的RF功率（P-RF），使用氢气生产Helicon等离子体。名古屋-III天线用于激发等离子体中的M = 1 Helicon模式。永磁磁铁产生所需的轴向磁场。等离子体被膨胀室中的多尖端结构限制在一起。从电感耦合模式到Helicon模式的转变在类似于700W的P-RF附近观察到，等离子体密度类似于10（18）m（-3）和驾驶员的电子温度5eV，并且在膨胀体积中类似于1eV 。通过使用H-α/ H-Beta比的光发射光谱诊断技术和激光光散热腔环向下光谱诊断技术，在膨胀室中测量在视线上的阴性氢离子密度。负氢离子密度的测量值在6μmTorr压力下为10（16）（-3），并且在Helicon模式下的功率，压力和下游轴向磁场变化不显着变化。将负离子密度测量与使用粒子平衡法计算的理论估计值进行比较，考虑到负责负氢离子产生和破坏的不同反应速率。应注意，目前，未注入铯在等离子体放电中以增强H离子密度。

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