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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >RF power transfer efficiency and plasma parameters of low pressure high power ICPs
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RF power transfer efficiency and plasma parameters of low pressure high power ICPs

机译：低压高功率ICP的RF功率传递效率和等离子体参数

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Inductively coupled radio frequency (RF) ion sources operating at 1 MHz under the condition of a low gas pressure of 0.3 Pa are the basis of negative hydrogen/deuterium ionbased neutral beam injection systems of future fusion devices. The applied high RF powers of up to 75 kW impose considerable strain on the RF system and so the RF power transfer efficiency eta becomes a crucial measure of the ion source's reliability. eta depends on external parameters such as geometry, RF frequency, power, gas pressure and hydrogen isotope. Hence, eta along with the plasma parameters are investigated experimentally at the ITER prototype RF ion source. At only 45%-65% in hydrogen and an increase of around 5% in deuterium, eta is found to be surprisingly low in this ion source. The power that is not coupled to the plasma is lost by Joule heating of the RF coil (similar to 26%) and due to eddy currents in the internal Faraday screen (similar to 74%). The matching transformer adds up to 8 kW of losses to the system. The low values of eta and the high share of the losses in the Faraday screen and the transformer strongly suggest optimization opportunities. At high power densities well above 5 W cm(-3), indications for neutral depletion as well as for the ponderomotive effect are found in the pressure and power trends of eta and the plasma parameters. The comprehensive data set may serve for comparison with other RF ion sources and more standard inductively coupled plasma setups as well as for validating models to optimize RF coupling.
机译：感应耦合射频（RF）离子源在0.3 Pa的低气压条件下以1 MHz的频率工作，是未来聚变装置中基于负氢/氘离子的中性束注入系统的基础。高达75千瓦的高射频功率对射频系统造成了相当大的压力，因此射频功率传输效率eta成为衡量离子源可靠性的关键指标。eta取决于外部参数，如几何形状、射频频率、功率、气体压力和氢同位素。因此，在ITER原型射频离子源上对eta和等离子体参数进行了实验研究。氢的eta含量仅为45%-65%，氘的eta含量增加约5%，在这种离子源中eta含量低得惊人。射频线圈的焦耳加热（类似于26%）和内部法拉第屏中的涡流（类似于74%）会损失不与等离子体耦合的功率。匹配的变压器为系统增加了高达8千瓦的损耗。eta的低值以及法拉第屏蔽和变压器中损耗的高份额强烈表明存在优化机会。在远高于5W cm（-3）的高功率密度下，eta的压力和功率趋势以及等离子体参数中发现了中性耗尽以及有质动力效应的迹象。综合数据集可用于与其他射频离子源和更标准的电感耦合等离子体装置进行比较，以及验证优化射频耦合的模型。

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