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Steady magnetic fields degrade plasma created by rotating magnetic fields in the Flinders ST*

Lance McCarthy2002年被引用 1Nuclear FusionIF 3出版社

The Flinders ST is a spherical tokamak project which has concentrated on the production by induction, of a low resistivity target plasma suitable for rotating magnetic field (RMF) current drive tests. Antennas for the production of the RMF fields were installed on the spherical tokamak device, so that it could operate as a device with pure RMF current drive (Rotamak), or purely as an inductively driven ST. Experiments with combinations of inductive and RMF current drive have been made. Experimental results obtained in this small Flinders ST device indicate areas of concern for the RMF current drive technique. First, the experiments show that the strong steady magnetic fields required for the spherical tokamak configuration degrade, and probably extinguish the RMF created plasma, when these transverse steady fields exceed some critical value, which is small compared to that required for ST operation. Second, a measure of the resistance of the pure RMF current drive device, using the ST solenoid and OH coils to create a small loop voltage purely as a diagnostic, shows that the RMF steady current is driven in a very resistive path.

日本語訳

抄録: Flinders STは球状トカマク計画であり、回転磁場(RMF)電流駆動試験に適した低抵抗率プラズマの誘導生成に重点を置いている。RMF場を生成するためのアンテナが球状トカマク装置に設置され、純粋なRMF電流駆動装置(Rotamak)として、または純粋に誘導駆動されるSTとして動作可能となった。誘導電流駆動とRMF電流駆動を組み合わせた実験が実施された。この小型Flinders ST装置で得られた実験結果は、RMF電流駆動技術に関する懸念領域を示している。第一に、実験により、球状トカマク配位に必要な強い定常磁場が、ST運転に必要な値と比較して小さい臨界値を横断磁場が超えると、RMF生成プラズマを劣化させ、おそらく消滅させることが示された。第二に、STソレノイドとオーミック(OH)コイルを用いて純粋に診断用の小さなループ電圧を生成し、純粋なRMF電流駆動の抵抗を測定したところ、RMF定常電流が非常に抵抗性の高い経路で駆動されていることが示された。

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