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首页> 外文期刊>Plasma and Fusion Research >Identification of Spurious Modes of High-Power 77-GHz Gyrotron for Collective Thomson Scattering in LHD
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Identification of Spurious Modes of High-Power 77-GHz Gyrotron for Collective Thomson Scattering in LHD

机译：LHD集体汤姆逊散射大功率77 GHz回旋加速器杂散模式的识别

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摘要

Frequency measurements at 74-80 GHz were conducted for the identification and suppression of spurious modes from the 77-GHz gyrotron, which was originally introduced as a power source for electron cyclotron resonance heating and is now also used as a probe beam for the collective Thomson scattering (CTS) diagnostic. The spurious modes are excited as the gyrotron output powe ris turned on and off by controlling the anode voltage. These modes are harmful for the CTS diagnostic, even though their power is less than approximately 50 dB below than that of the main mode. The measured frequency of one of the spurious modes is approximately 74.7 GHz. The cavity structure, starting current calculation, and mode competition calculation suggest that the spurious mode is the TE17,6 mode. The result is important for optimizing the gyrotron operation as a CTS probe beam and suppressing or minimizing the spurious mode excitation.
机译：进行了74-80 GHz的频率测量，以识别和抑制77 GHz回旋管的杂散模式，该回旋管最初被用作电子回旋共振加热的电源，现在也用作集体Thomson的探测束散射（CTS）诊断。当回旋管输出功率通过控制阳极电压打开和关闭时，杂散模式被激发。这些模式对CTS诊断有害，即使它们的功率比主模式低约50 dB。一种杂散模式的测量频率约为74.7 GHz。腔结构，启动电流计算和模式竞争计算表明，杂散模式为TE 17,6 模式。该结果对于优化回旋加速器作为CTS探测光束的操作以及抑制或最小化杂散模式激发非常重要。

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