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Kinetic equilibrium reconstructions of plasmas in the MAST database and preparation for reconstruction of the first plasmas in MAST upgrade

J W Berkery, S A Sabbagh, L Kogan, D Ryan, J M Bialek, Y Jiang, D J Battaglia, S Gibson, C Ham2021年Plasma Physics and Controlled FusionIF 2.2出版社

Reconstructions of plasma equilibria using magnetic sensors were routine during operation of the Mega Ampere Spherical Tokamak (MAST) device, but reconstructions using kinetic profiles were not. These are necessary for stability and disruption analysis of the MAST database, as well as for operation in the upgrade to the device, MAST-U. The three-dimensional (3D) code VALEN is used to determine eddy currents in the 3D vessel structures for vacuum coil test shots, which are then mapped to effective resistances in the two-dimensional vessel groupings in the EFIT equilibrium reconstruction code to be used in conjunction with nearby loop voltage measurements for estimated currents in the structures during reconstruction. Kinetic equilibrium reconstructions with EFIT, using all available magnetic sensors as well as Thomson scattering measurements of electron temperature and density, charge exchange recombination spectroscopy measurements of ion temperature, and internal magnetic field pitch angle measurements from a motional Stark effect (MSE) diagnostic are performed for a large database of MAST discharges. Excellent convergence errors are obtained for the portions of the discharges where the stored energy was not too low, and it is found that reconstructions performed with temperature and density measurements but without MSE data usually already match the pitch angle measurements well. A database of 275 kinetic equilibria is used to test the ideal MHD stability calculation capability for MAST. Finally, the necessary changes to conducting structure in VALEN, and diagnostic setup in EFIT have been completed for the upgrade from MAST to MAST-U, enabling kinetic reconstructions to commence from the first plasma discharges of the upgraded device.

日本語訳

MAST装置の運転中、磁気センサーを用いたプラズマ平衡再構成は日常的に行われていたが、運動論的プロファイルを用いた再構成は行われていなかった。これらはMASTデータベースの安定性・破壊解析、およびMAST-Uへの装置アップグレード後の運転に必要である。3次元コードVALENを用いて、真空コイル試験ショットにおける3次元容器構造内の渦電流を決定し、これをEFIT平衡再構成コードにおける2次元容器グループの実効抵抗にマッピングした。再構成中の構造内の推定電流は、近傍のループ電圧測定と組み合わせて使用された。利用可能な全ての磁気センサーに加え、トムソン散乱による電子温度・密度測定、荷電交換分光法によるイオン温度測定、モーションラル・スターク効果(MSE)診断による内部磁場ピッチ角測定を用いた運動論的平衡再構成を、MASTの大規模放電データベースに対して実施した。蓄積エネルギーが低すぎない放電領域では、優れた収束誤差が得られた。また、温度・密度測定を用いたがMSE測定を用いない再構成でも、通常はMSEピッチ角測定と良好に一致することが判明した。275の運動論的平衡からなるデータベースを用いて、MASTの理想MHD安定性計算能力を検証した。最後に、MAST-Uへのアップグレードに向けて、VALENにおける導体構造の変更とEFITにおける診断設定の変更を完了し、アップグレード装置の最初の放電から運動論的再構成を開始できるようにした。

装置

mast高精度(タイトル一致)

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MASTMAST UpgradeEquilibrium reconstruction
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