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Orbit-modulated transport and sources in time-dependent plasmas

T Stoltzfus-Dueck, Hongxuan Zhu2021年Plasma Physics and Controlled FusionIF 2.2出版社

The orbit-modulation framework for steady-state ion-orbit boundary fluxes is reformulated to apply to time-dependent plasmas. The new formulation can quantify the extent to which orbit fluxes are affected by the time dependence of the distribution function, and may be applied both to time-dependent physical scenarios and to computationally expensive simulations that are unable to reach a true steady state. As the system tends to a time-independent state, the orbit-loss fluxes approach their steady-state values, which are determined entirely by upstream transport (turbulent and collisional) and upstream sources and sinks. This result holds for the fluxes of any moments that are expressible in terms of the invariants that determine the orbits, including parallel toroidal angular momentum.

日本語訳

定常状態のイオン境界フラックスに対する軌道変調フレームワークは、時間依存プラズマに適用できるように再定式化される。新しい定式化は、分布関数の時間依存性によって軌道フラックスがどの程度影響を受けるかを定量化することができ、時間依存の物理的シナリオと、真の定常状態に到達できない計算コストの高いシミュレーションの両方に適用可能である。系が時間非依存状態に近づくにつれて、軌道損失フラックスは定常状態の値に近づき、その値は上流の輸送(乱流および衝突性)と上流の源および消滅によって完全に決定される。この結果は、軌道を決定する不変量によって表現可能な任意のモーメントのフラックスに対して成り立ち、平行トロイダル角運動量を含む。

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