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Rational surface localization and MHD activity measurements using fast sweep reflectometry on Tore Supra

L Vermare, F Clairet, S Heuraux, G Leclert2005年Plasma Physics and Controlled FusionIF 2.2出版社

Investigations on magnetohydrodynamics (MHD) modes using X-mode frequency modulated continuous wave reflectometry have been realized on Tore Supra. Two heterodyne reflectometers operating between 50–75 GHz and 75–110 GHz probe the low field side of the plasma, and the detection of the magnetic islands is performed through the perturbations recorded onto the phase and amplitude of the reflected signal. Fast sweep technique associated with a high repetition rate provides a high radial resolution with a high temporal resolution (up to 20 kHz). The radial localization of rational surfaces is achieved along with the measured density profile. Detection of the time of flight discontinuities in combination with equilibrium code calculations of the current profile allows for the accurate determination of core plasma MHD modes at the q = 1 and q = 2 rational surfaces. Continuous sweeping gives detailed analysis of the radial and poloidal structure of the magnetic island.

日本語訳

Tore Supraにおいて、Xモード周波数変調連続波反射測定を用いた磁気流体力学(MHD)モードの調査が実施された。50–75 GHzおよび75–110 GHzで動作する2つのヘテロダイン反射計がプラズマの低磁場側をプローブし、磁気島の検出は反射信号の位相および振幅に記録された摂動を通じて行われる。高い繰り返し率を伴う高速掃引技術は、高い時間分解能(最大20 kHz)を備えた高い空間分解能を提供する。有理面の動径方向の位置特定は、測定された密度分布とともに達成される。飛行時間の不連続性の検出は、平衡コードによる電流分布計算と組み合わせることで、q = 1およびq = 2有理面におけるコアプラズマMHDモードの正確な決定を可能にする。連続掃引は、磁気島の動径方向およびポロイダル方向の構造の詳細な解析をもたらす。

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Fusion Advanced Studies TorusMagnetohydrodynamicsTore SupraReflectometry
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