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Inductive lenses for improved magnetic field symmetry in a corrugated theta-pinch coil

F. Hartz, J. Junker, F. Pohl, G.H. Wolf1969年Nuclear FusionIF 3出版社

The magnetic field distribution of corrugated theta-pinch coils is measured in an analogue experiment (experimental error 0.05%) in order to determine the perturbation of the rotational symmetry induced by the current feed slot.The maximum deviations from rotational symmetry are found near the coil surface around the current feed slot. They have a value of a few per cent and are proportional to the width of the current feed slot. The perturbations decrease towards the coil axis to a few tenths per cent only.The distribution of a locally varying inductance of the current transmission line is computed and applied by moulding inductive lenses into the transmission line plates. The influence of the inductive lenses is measured. Within a radial region of about 1/2 of the coil radius the perturbations are found to be reduced to the level of the experimental error. The residual perturbations outside this region are mainly attributed to the limited space available for the application of the inductive lenses in the transmission line system.

日本語訳

波形シータピンチコイルの磁場分布は、電流供給スロットによって誘起される回転対称性の摂動を決定するために、アナログ実験(実験誤差0.05%)において測定された。回転対称性からの最大偏差は、電流供給スロットの周囲のコイル表面近傍で見出される。それらは数パーセントの値を持ち、電流供給スロットの幅に比例する。摂動はコイル軸に向かって減少し、わずか数十分の一パーセントにまでなる。電流伝送線路の局所的に変化するインダクタンスの分布が計算され、伝送線路プレートに誘導レンズを成形することによって適用された。誘導レンズの影響が測定された。コイル半径の約1/2の半径方向領域内では、摂動は実験誤差のレベルまで低減されることが見出された。この領域の外側の残存摂動は、主に伝送線路システムにおいて誘導レンズを適用するために利用可能なスペースが限られていることに起因する。

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