Research of Electron Cyclotron Resonance Heating Methods and Relevant Experiments
Research of Electron Cyclotron Resonance Heating Methods and Relevant Experiments
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DOI：
10.13182/fst10-a10841
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发表时间：
2010-07
影响因子：
0.9
通讯作者：
H. Igami;S. Kubo;T. Shimozuma;Y. Yoshimura;T. Notake;H. Takahashi;H. Idei;S. Inagaki;H. Tanaka;K. Nagasaki;K. Ohkubo;T. Mutoh
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文献类型：
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作者：
H. Igami;S. Kubo;T. Shimozuma;Y. Yoshimura;T. Notake;H. Takahashi;H. Idei;S. Inagaki;H. Tanaka;K. Nagasaki;K. Ohkubo;T. Mutoh
为了扩大电子回旋共振加热(ECRH)的适用参数范围，利用大型螺旋装置(LHD)中77 GHz、82.7 GHz、84 GHz和168 GHz回旋管的毫米波源，研究了电子回旋共振加热的各种方法。基波普通(O-)模和二次谐波异常(X-)模主要用于启动、维持和控制等离子体。在较宽的中心电子密度范围内，实验研究了这些模式对ECRH加热效率的影响，并与射线跟踪计算得到的功率吸收率进行了比较。在发射84 GHz范围和168 GHz毫米波的每种磁结构Bax=1和2T中，已经执行了三次谐波X模ECRH。在两种情况下都观察到电子温度和存储能量的增加。基于静电电子伯恩斯坦波(EBW)的ECRH在传统的电磁模式ECRH方法无法实现的参数范围内有望成为一种有前途的替代方法。为了在LHD、非常EBW(X-B)和普通-非常EBW(O-X-B)模式转换过程中利用电子束焊接来实现ECRH，从实验和理论上研究了波的传播和吸收。
Abstract For expanding applicable parameter ranges of electron cyclotron resonance heating (ECRH), various methods of ECRH have been studied with use of millimeter-wave sources of 77-, 82.7-, 84-, and 168-GHz gyrotrons in the Large Helical Device (LHD). The fundamental ordinary (O-) mode and the second-harmonic extraordinary (X-) mode are mainly used for starting up, sustaining, and controlling the plasma. Heating efficiencies of ECRH by launching of these modes have been investigated experimentally for wide range of the central electron density and compared with power absorption rates obtained by ray-tracing calculation. ECRH by the third-harmonic X-mode has been performed in each magnetic configuration Bax = 1 and 2 T with launching of 84-GHz range and 168-GHz millimeter waves. Increases of the electron temperature and the stored energy were observed in both cases. ECRH by the electrostatic electron Bernstein wave (EBW) has been expected to be a promising substitute in parameter ranges where the conventional methods of ECRH by the electromagnetic modes are not available. To perform ECRH by the EBW in LHD, extraordinary-EBW (X-B) and ordinary-extraordinary-EBW (O-X-B) mode conversion processes, the propagation of the wave, and the absorption have been investigated experimentally and theoretically.