Development of terahertz gyrotrons and their application to LHD CTS
Development of terahertz gyrotrons and their application to LHD CTS
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太赫兹回旋管的研制及其在LHD CTS中的应用
DOI：
10.1088/1742-6596/227/1/012013
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
他6名
中科院分区：
文献类型：
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作者：
T. Saito;T. Notake;Y. Tatematsu;A. Fujii;S. Ogasawara;La Agusu;T. Idehara;他6名
一个高功率，亚太赫兹脉冲回旋管的发展已经开始在FIR FU应用于CTS LHD。设计了一种新型的电子枪，用于产生高质量的层流电子束。选择二次谐波TE 6，5和TE 8，5模式作为与其他竞争模式良好隔离的振荡模式。TE 6，5和TE 8，5模式的单模振荡已被证实。TE 6，5模（0.349 THz）的最大功率大于50 kW，TE 8，5模（0.390 THz）的最大功率约为40 kW。这些功率是该频段二次谐波回旋管的新记录。研究了用0.4THz脉冲回旋管从LHD高密度等离子体中产生CTS的可行性。CTS条件是满足一个广泛的操作制度和散射角足够大，良好的空间分辨率。射线追迹计算表明，发射的散射光束几乎是直线传播的。用新开发的程序计算的CTS谱表明，对于100 kW回旋管，相对于ECE，可以获得大的信噪比。
Development of a high-power, sub terahertz pulse gyrotron has started in FIR FU for application to CTS on LHD. A new electron gun was designed to produce a laminar electron beam with a good quality. Second harmonic TE 6, 5 and TE 8, 5 modes were selected as oscillation modes well isolated from other competing modes. Single mode oscillation has been confirmed for both TE 6, 5 and TE 8, 5 modes. The maximum power is larger than 50 kW for TE 6, 5 mode (0.349 THz) and about 40 kW for TE 8, 5 mode (0.390 THz). These powers are new records of second harmonic gyrotron in this frequency range. Feasibility study of CTS with a 0.4 THz pulse gyrotron from a high density plasma in LHD was carried out. The CTS condition is satisfied for a wide operation regime and scattering angles large enough for good spatial resolution. Ray tracing calculation shows that the launched scattered beams are propagated almost straight. CTS spectra calculated with a newly developed code indicates that a large signal to noise ratio can be obtained against ECE for use of a 100 kW gyrotron.