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Reconstruction of recycling flux from synthetic camera images, evaluated for the Wendelstein 7-X startup limiter

H. Frerichs, F. Effenberg, Y. Feng, O. Schmitz, L. Stephey, D. Reiter, P. Börner, The W7-X Team2017年被引用 14Nuclear FusionIF 3出版社

The interpretation of spectroscopic measurements in the edge region of high-temperature plasmas can be guided by modeling with the EMC3-EIRENE code. A versatile synthetic diagnostic module, initially developed for the generation of synthetic camera images, has been extended for the evaluation of the inverse problem in which the observable photon flux is related back to the originating particle flux (recycling). An application of this synthetic diagnostic to the startup phase (inboard) limiter in Wendelstein 7-X (W7-X) is presented, and reconstruction of recycling from synthetic observation of emission is evaluated. It is shown that recycling—in terms of re-ionization within the view cone of the camera—is underestimated by a factor of about 3 at the peak location and overestimated in between, and that emission related to molecular dissociation can locally yield an additional factor of 2 for the ionization to photon conversion. Fitted conversion factors are extracted from the simulation results which include a dependence on the plasma density.

日本語訳

高温プラズマの周辺領域における分光測定の解釈は、EMC3-EIRENEコードによるモデリングによって導くことができる。当初は合成カメラ画像の生成のために開発された多用途合成診断モジュールは、観測可能な光子フラックスを起源となる粒子フラックス(リサイクリング)に関連付ける逆問題の評価のために拡張された。この合成診断のWendelstein 7-X(W7-X)における起動段階(内側)リミッターへの適用が提示され、合成観測からのリサイクリングの再構成が評価された。リサイクリング——カメラの視野内での再電離の観点で——は、ピーク位置では約3倍過小評価され、その間では過大評価されること、また、分子解離に関連する発光は、電離から光子への変換において局所的にさらに2倍の追加要因をもたらす可能性があることが示された。適合された変換係数は、プラズマ密度への依存性を含むシミュレーション結果から抽出された。

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