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Plasma stability in Heliac-like quasi-helically symmetric stellarators

M.Yu. Isaev, W.A. Cooper, S.Yu. Medvedev, M.I. Mikhajlov, V.D. Shafranov, A.A. Subbotin1997年被引用 5Nuclear FusionIF 3出版社

An attempt is made to find an optimal quasi-helically symmetric (QHS) four period magnetic configuration with a Heliac-like structure of the magnetic surface cross-sections. This means that the cross-sections rotate in phase with the magnetic axis principal normal in contrast to the Helias-like systems where the magnetic surface cross-sections rotate half as fast as the principal normal. The equilibrium and local stability are studied with the VMEC and TERPSICHORE codes. It is shown that, in the configuration found, the equilibrium beta limit is about 9%, the Mercier beta limit is about 4% and the ballooning modes restrict the beta value to 1%. The accuracy of the fulfilment of the QHS condition is given by X~3 (i.e. the largest amplitude of the magnetic field strength B harmonic that violates the quasi-symmetry is a third that of the main helical harmonic of B in Boozer co-ordinates)

日本語訳

準対称(QHS)4周期磁場配位を、ヘリアック様の磁気面断面構造を持つものとして最適化する試みを行う。すなわち、磁気面断面が磁気軸の主法線と同位相で回転するのに対し、ヘリアス様系では磁気面断面が主法線の半分の速さで回転する。平衡と安定性はVMECおよびTERPSICHOREコードを用いて調べる。見出された配位では、平衡ベータ限界は約9%、Mercierベータ限界は約4%、バルーニングモードがベータ値を1%に制限することが示される。QHS条件の満足精度はX~3で与えられる(すなわち、準対称性を破る磁場強度Bの高調波の最大振幅は、Boozer座標における主ヘリカル高調波の3分の1である)。

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