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Ray-tracing analysis of ICRH power-deposition profiles in non-circular large Tokamaks

D Van Eester, V P Bhatnagar, R Koch1985年Plasma Physics and Controlled FusionIF 2.2出版社

Using self-consistent initial conditions obtained from the full-wave solution of the field radiated by an ion-cyclotron resonance heating (ICRH) antenna, the ray-tracing technique is applied to generate r.f. power-deposition profiles in non-circular large Tokamaks such as JET and NET/INTOR. An analytic expression has been used to simulate the shape of the flux surfaces, which fit reasonably well to the numerical solutions of the Grad-Shafranov equation describing the Tokamak equilibrium, by adjusting three free parameters: the flux-surface shift Delta , the elongation ratio kappa and the triangularity parameter delta . For an elliptic INTOR plasma, it is found that the focussing of rays is much reduced and when the absorption layer is located in the center, the r.f. power density figures are lower approximately by a factor of 1.9 compared to that obtained in an equivalent circular case. This reduction in power density is not so significant when the power is deposited off-center, as demonstrated by an example treated for the JET D-shaped plasma.

日本語訳

自己無撞着な初期条件を、イオンサイクロトロン共鳴加熱(ICRH)アンテナによって放射される場の全波解から得て、光線追跡法を適用し、JETやNET/INTORのような非円形大型トカマクにおける高周波電力堆積分布を生成する。磁気面の形状を模擬するために解析的表現が用いられており、これはトカマク平衡を記述するGrad-Shafranov方程式の数値解に、磁気面シフトΔ、伸長比κ、および三角形変形パラメータδの3つの自由パラメータを調整することによって、かなり良く適合する。楕円形のINTORプラズマについては、光線の集束が大幅に減少することが見出され、吸収層が中心に位置する場合、高周波電力密度は、同等の円形の場合に得られる値と比較して、およそ1.9倍低くなる。この電力密度の減少は、電力が中心から外れて堆積される場合にはそれほど顕著ではなく、JETのD字形プラズマについて扱った例によって実証されている。

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Ion cyclotron heating
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