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Impact of Yacora evaluated molecular effective rate coefficients on detached SOLPS-ITER simulations

J. Bryant, K. McKay, J.R. Harrison, D. Moulton, K. Verhaegh, C. Cowley, R.C. Bergmayr, U. Fantz, D. Wünderlich2025年3月Nuclear FusionIF 3出版社

Presently, SOLPS-ITER does not replicate the levels of plasma-molecular interactions seen during deep detachment on the Super-X divertors of MAST-Upgrade and TCV. At low temperatures () relevant to deep detachment, the AMJUEL reaction database contains discrepancies for detachment relevant molecular processes. In order to correct this the vibrationally resolved ground state Yacora model for H2 (Yacora ) has been used to calculate the vibrational distribution and thus from the cross-sections of the Yacora model effective rate coefficients for these molecular processes. Reduced and extended implementations of Yacora were constructed to form EIRENE-style databases for use in SOLPS-ITER. The reduced implementation utilises the same processes as EIRENE, but with updated cross-sectional data, whilst the extended implementation adds additional processes. The improved cross-sectional data lowers the threshold for molecular charge exchange (MCX) compared to AMJUEL, whilst the inclusion of the additional processes boosts the vibrational excitation in the molecular ground state providing the additional excitation energy required for MCX to be significant at low temperatures (). When applied to a SOLPS-ITER isolated divertor leg setup, both implementations produce greater levels of MCX that result in elevated molecular ion densities () than the default rate setup. The higher levels of contribute to detachment via increased levels of Molecular Activated Recombination and Molecular Activated Dissociation. These plasma-molecular interactions elevate the neutral population. During detachment this has a strong impact on power and momentum losses, as well as elevated levels of Balmer α line emission and an earlier onset of the ion target flux rollover. These effects are strongest when the extended database is used.

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AIによる論文要約

Yacora評価分子有効速度係数がSOLPS-ITERシミュレーションの分離に及ぼす影響
JAこの論文は、プラズマ分子相互作用の重要性を理解し、プラズマ分離の正確なモデル化を目指す核融合研究者に有益です。また、SOLPS-ITERコードの開発者にも重要な知見を提供します。#PlasmaDetachment #MolecularProcesses #SOLPS-ITER
LLM向け: {'Title': 'Impact of Yacora evaluated molecular effective rate coefficients on d…

この論文では、SOLPS-ITERシミュレーションにおいて、分子プロセスの改善が深い分離の再現に重要であることを示しています。Yacora H2モデルを使用して更新された分子過程の有効速度係数を導入することで、分子電荷交換の閾値が低下し、振動励起が増加し、分子活性化再結合と分子活性化解離が促進されることが明らかになりました。これらの効果により、中性粒子密度、放射損失、運動量損失が増加し、イオンターゲットフラックスの早期ロールオーバーが観察されました。

Impact of Yacora evaluated molecular effective rate coefficients on detached SOLPS-ITER simulations
ENThis paper is of interest to fusion researchers working on plasma-material interactions and divertor modeling, as it demonstrates how improved molecular reaction data can significantly impact the accuracy of detachment simulations.#FusionResearch #PlasmaDetachment #MolecularReactions #SOLPS-ITER
LLM向け: {'Title': 'Impact of Yacora evaluated molecular effective rate coefficients on d…

This paper investigates how using updated molecular reaction data from the Yacora model improves the accuracy of SOLPS-ITER simulations of plasma detachment. The new data lowers the threshold for molecular charge exchange and increases vibrational excitation, leading to higher molecular ion densities and enhanced power/momentum losses during detachment.

Yacora評価分子有効速度係数がSOLPS-ITER分離された分離腔シミュレーションに与える影響
JAこの論文は、核融合プラズマの分離現象を理解し、シミュレーションモデルの精度を向上させたい研究者や学生に有益である。#核融合#プラズマ分離#分子過程#SOLPS-ITER
LLM向け: {'Title': 'Yacora評価分子有効速度係数がSOLPS-ITER分離された分離腔シミュレーションに与える影響', 'Author(s)': '不明'…

この論文では、SOLPS-ITERシミュレーションで深い分離の際に見られる分子-プラズマ相互作用の水準を再現できていない問題を解決するため、Yacora H2モデルを用いて分子過程の有効速度係数を計算し、SOLPS-ITERに実装した。その結果、分子電荷交換反応の閾値が低下し、振動励起が増加して、分子活性化再結合や分子活性化解離が促進され、中性粒子密度が上昇し、分離時の出力・運動量損失や輝線強度に影響を与えることが示された。

Impact of Yacora evaluated molecular effective rate coefficients on detached SOLPS-ITER simulations
ENThis paper will be of interest to fusion researchers and modelers working on plasma-surface interactions and detachment in fusion devices, as well as those interested in improving the accuracy of plasma edge simulations.#FusionPlasmaDetachment #PlasmaEdgeModeling #MolecularReactions
LLM向け: {'Title': 'Impact of Yacora evaluated molecular effective rate coefficients on d…

This paper investigates the impact of updated molecular reaction rates on simulations of plasma detachment in fusion devices. The authors used the Yacora model to calculate improved rate coefficients for key molecular processes and implemented them in the SOLPS-ITER code. The results show that these updated rates lead to increased molecular ion densities, which in turn enhance power and momentum losses, Balmer alpha emission, and the onset of detachment.

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