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Ripple transport in helical-axis advanced stellarators: a comparison with classical stellarator/torsatrons

C D Beidler, W N G Hitchon1994年Plasma Physics and Controlled FusionIF 2.2出版社

Calculations of the neoclassical transport rates due to particles trapped in the helical ripples of a stellarator's magnetic field are carried out, based on solutions of the bounce-averaged kinetic equation. These calculations employ a model for the magnetic field strength, B, which is an accurate approximation to the actual B for a wide variety of stellarator-type devices, among which are Helical-Axis Advanced Stellarators (Helias) as well as conventional stellarators and torsatrons. Comparisons are carried out in which it is shown that the Helias concept leads to significant reductions in neoclassical transport rates throughout the entire long-mean-free-path regime, with the reduction being particularly dramatic in the nu -1 regime. These findings are confirmed by numerical simulations. Further, it is shown that the behaviour of deeply trapped particles in Helias can be fundamentally different from that in classical stellarator/torsatrons; as a consequence, the beneficial effects of a radial electric field on the transport make themselves felt at a lower collision frequency than is usual.

日本語訳

恒星状器の螺旋リップルに捕捉された粒子による新古典輸送率の計算を、バウンス平均化運動論方程式の解に基づいて行う。これらの計算では、磁場強度Bのモデルを用いるが、これは広範な種類の恒星状器装置、すなわちヘリカル軸先進恒星状器(Helias)ならびに従来型恒星状器およびトルサトロンを含む装置群における実際のBに対する正確な近似である。比較を行い、Heliasの概念が長平均自由行程領域全体にわたって新古典輸送率の大幅な低減をもたらすことを示す。その低減は特にν⁻¹領域において顕著である。これらの結果は数値シミュレーションによって確認される。さらに、Heliasにおける深く捕捉された粒子の挙動が、古典的な恒星状器/トルサトロンにおけるそれと根本的に異なり得ることを示す。その結果として、径方向電場の有益な効果が、通常よりも低い衝突周波数で顕在化する。

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