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A novel fast-scanning microwave heterodyne radiometer system for electron cyclotron emission measurements in the HT-7 superconducting tokamak

S Y Zhang, V Poznyak, E Ploskirev, D Kalupin, Y X Wan, J K Xie, J R Luo, J G Li, G L Kuang, X Gao2000年Plasma Physics and Controlled FusionIF 2.2出版社

Two sets of fast-scanning microwave heterodyne radiometer receiver systems employing backward-wave oscillators in the 78-118 GHz and 118-178 GHz ranges were developed for electron cyclotron emission measurements (ECE) on the HT-7 superconducting tokamak. The double-sideband radiometer in the 78-118 GHz range measures 16 ECE frequency points with a scanning period of 0.65 ms. The novel design of the 2 mm fast-scanning heterodyne radiometer in the 118-178 GHz range enables the unique system to measure 48 ECE frequency points in 0.65 ms periodically. The plasma profile consistency in reproducible ohmic plasmas was used to relatively calibrate each channel by changing the toroidal magnetic field shot-by-shot. The absolute temperature value was obtained by a comparison with the results from the soft x-ray pulse height analysis measurements and Thomson scattering system. A preliminary temperature profile measurement result in pellet injection plasma is presented.

日本語訳

78-118 GHzおよび118-178 GHzの周波数帯で動作する後進波発振器を用いた2つの高速走査マイクロ波ヘテロダイン放射計受信システムが、HT-7超伝導トカマクにおける電子サイクロトロン放射(ECE)測定のために開発された。78-118 GHz帯のダブルサイドバンド放射計は、0.65 msの走査周期で16個のECE周波数点を測定する。118-178 GHz帯の2 mm高速走査ヘテロダイン放射計の新規設計により、0.65 msの周期で48個のECE周波数点を測定することが可能となった。再現性のあるオーミックプラズマにおけるプラズマプロファイルの整合性を利用して、各チャンネルの相対較正を、トロイダル磁場をショットごとに変化させることで行った。絶対温度値は、軟X線パルス高分析測定およびトムソン散乱システムの結果との比較により得られた。ペレット入射プラズマにおける予備的な温度プロファイル測定結果を示す。

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Fusion Advanced Studies TorusElectron cyclotron emissionHT-7
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