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Efficiency and scaling of current drive and refuelling by spheromak injection into a tokamak

M.R. Brown, P.M. Bellan1992年被引用 38Nuclear FusionIF 3出版社

The first measurements of current drive (refluxing) and refuelling by spheromak injection into a tokamak are discussed in detail. The current drive mechanism is attributed to the process of helicity injection, and refuelling is attributed to the rapid incorporation of the dense spheromak plasma into the tokamak. After an abrupt increase (up to 80%), the tokamak current decays by a factor of three because of plasma cooling caused by the merging of the relatively cold spheromak with the tokamak. The tokamak density profile peaks sharply because of the injected spheromak plasma (ne increases by a factor of six) and then becomes hollow, suggestive of an interchange instability. Also discussed is the energy efficiency of spheromak injection current drive and the scaling of this process to larger machines. Refuelling by spheromak injection appears to be a viable scheme for larger machines. However, refluxing by spheromak injection is limited by geometrical and electrical efficiencies (both about 10%) as well as a high repetition rate requirement

日本語訳

トカマクへのスフェロマック注入による電流駆動(リフラックス)と燃料補給の最初の測定結果について、詳細に論じる。電流駆動のメカニズムはヘリシティ注入の過程に帰属され、燃料補給は高密度のスフェロマックプラズマがトカマクへ急速に取り込まれることに帰属される。急激な増加(最大80%)の後、トカマク電流は、比較的低温のスフェロマックとトカマクの合体によって生じるプラズマ冷却により、3分の1に減衰する。トカマクの密度分布は、注入されたスフェロマックプラズマにより鋭くピークを示し(neは6倍に増加)、その後、交換不安定性を示唆する中空形状になる。また、スフェロマック注入電流駆動のエネルギー効率と、この過程のより大型装置へのスケーリングについても論じる。スフェロマック注入による燃料補給は、より大型の装置に対して実現可能な方式であると思われる。しかし、スフェロマック注入によるリフラックスは、幾何学的および電気的効率(ともに約10%)と高い繰り返し率の要件によって制限される。

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