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Flux, energy, and particle lifetime measurements for well formed field reversed configurations

A.L. Hoffman, J.T. Slough1986年被引用 34Nuclear FusionIF 3出版社

Experimental flux, energy and particle lifetimes are reported for a wide range of plasma conditions (Ti = 100–800 eV, rs = 3.5–7 cm) in the slow risetime TRX-2 field reversed theta pinch. The lifetimes exhibit a scaling with the parameter rs/ρi01/2 to an exponent of between 2.7 and 3.6. This favourable scaling, especially for the flux lifetime, implies an average plasma resistivity which scales as the drift parameter vE/vi to some power greater than unity. For present small devices, typical flux diffusion coefficients are about 4 m2·s−1 and, based on the above scaling, would decrease rapidly in larger devices with smaller pressure gradient scalelengths. The above scaling is obtained only for well formed FRCs with low levels of formation turbulence, and it remains to be seen if this low turbulence level can be maintained in larger, less kinetic, FRCs.

日本語訳

低速立ち上がりTRX-2反転磁場シータピンチにおいて、広範囲のプラズマ条件(Ti = 100–800 eV、rs = 3.5–7 cm)に対する実験的なフラックス、エネルギー、粒子の寿命を報告する。寿命はパラメータrs/ρi01/2に対して2.7から3.6の間の指数でスケーリングを示す。この好ましいスケーリングは、特にフラックス寿命において、平均プラズマ抵抗率がドリフトパラメータvE/viの1より大きいあるべき乗でスケーリングすることを示唆する。現在の小型装置では、典型的なフラックス拡散係数は約4 m2·s−1であり、上記のスケーリングに基づくと、圧力勾配スケール長がより小さい大型装置では急速に減少するであろう。上記のスケーリングは、形成時の乱流レベルが低い、よく形成されたFRCに対してのみ得られており、この低い乱流レベルが、より大型で運動論的効果の小さいFRCにおいても維持できるかどうかは今後の課題である。

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Field-Reversed Configuration
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