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首页> 外文期刊>Plasma and Fusion Research >Development of Collective Thomson Scattering Diagnostic for Bulk and Fast Ions in the Large Helical Device
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Development of Collective Thomson Scattering Diagnostic for Bulk and Fast Ions in the Large Helical Device

机译：大型螺旋装置中大体积和快速离子的集体汤姆森散射诊断技术的发展

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The collective Thomson scattering (CTS) technique has been utilized with the backscattering configuration to diagnose the bulk and fast ions in the Large Helical Device (LHD). The spectrogram of the scattered radiation presents the transient phenomena related to fast ion slowing down in auxiliary neutral beam heated plasmas. This is obtained by the broad band receiver resolving with 32 channels, while the probing beam from 77 GHz gyrotron is modulated with 50 Hz and is injected into plasmas. In the same shot, especially in low temperature plasma (Te, Ti < 1 keV), a wave excitation is also observed in a narrow frequency band. The peaks in the CTS spectrum exist between 0.5 and 1.0 GHz and are observed in both frequency sides asymmetry. For the forthcoming experiments, the feasibility of CTS diagnostics at a new port location is assessed to extend the diagnostic capability for measuring the ion velocity components. Expected spectra for scattered radiation are the same signal level as the present location from a numerical calculation.
机译：集体汤姆逊散射（CTS）技术已与反向散射配置结合使用，以诊断大型螺旋装置（LHD）中的大量离子和快速离子。散射辐射的频谱图显示了与辅助中性束加热等离子体中的快速离子减速有关的瞬态现象。这是通过解析32个通道的宽带接收器获得的，而来自77 GHz回旋管的探测光束以50 Hz进行调制并注入到等离子体中。在同一炮弹中，尤其是在低温等离子体（T e ，T i <1 keV）中，在窄频带中也观察到了波激励。 CTS频谱中的峰值存在于0.5至1.0 GHz之间，并且在两个频率侧的不对称性中都可以观察到。对于即将进行的实验，评估了在新端口位置进行CTS诊断的可行性，以扩展用于测量离子速度分量的诊断能力。根据数值计算，散射辐射的预期光谱与当前位置的信号电平相同。

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