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Two-fluid burning-plasma analysis for magnetic confinement fusion devices

L Guazzotto, R Betti2019年Plasma Physics and Controlled FusionIF 2.2出版社

The two-fluid, Lawson-type ignition model of (Guazzotto and Betti 2017 Phys. Plasmas24 082504) for nuclear fusion concepts is extended to burning-plasmas. Numerical estimates for the Lawson product are obtained for different values of the gain factor Q and different plasma conditions. Namely, different assumptions are made for the various energy confinement times in the model and different density and temperature profiles are considered. It is found that it is easier to reach the burning plasma condition with peaked profiles. A technique for comparing pure-deuterium (DD) 'equivalent' experimental discharges with the predictions of our model for deuterium–tritium (DT) burning plasma discharges is described. This is done through the introduction of 'no − α' quantities using a procedure similar to the one used in inertial confinement fusion. Using tokamaks as a meaningful example, an experimental fit for the energy confinement time is introduced in the calculations and shown to have a considerable effect on the results, qualitatively changing the thermal stability of the system and the equivalent Lawson product estimates of pure deuterium plasmas. Moreover, if the energy confinement time depends on the heating power as in experimental scalings, the equivalent in DD discharges is higher than the corresponding in a DT plasma.

日本語訳

(Guazzotto and Betti 2017 Phys. Plasmas 24 082504) の核融合概念に対する二流体・ローソン型点火モデルを、燃焼プラズマへ拡張する。ローソン積の数値評価を、利得係数Qの異なる値と異なるプラズマ条件に対して行う。すなわち、モデル内の様々なエネルギー閉じ込め時間について異なる仮定を設け、異なる密度・温度分布を考慮する。尖った分布の場合に燃焼プラズマ条件へ到達しやすいことが分かる。純重水素(DD)「等価」実験放電を、重水素–三重水素(DT)燃焼プラズマに対する我々のモデルの予測と比較する手法を述べる。これは、慣性核融合で用いられる手順と同様に、「no − α」量を導入することで行われる。トカマクを有意義な例として用い、エネルギー閉じ込め時間に対する実験的フィッティングを導入し、その結果への影響を示す。これは系の熱安定性と純重水素プラズマの等価ローソン積の評価を定性的に変化させる。さらに、エネルギー閉じ込め時間が実験スケーリングのように加熱出力に依存する場合、DD放電における等価値はDTプラズマにおける対応する値よりも高くなる。

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