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First tungsten radiation studies in DIII-D's ITER baseline demonstration discharges

F. Turco, T.C. Luce, ACC. Sips, C. Greenfield, T. Osborne, T. Odstrcil, J.M. Hanson, A. McLean, A.W. Hyatt2024年7月Nuclear FusionIF 3出版社

ITER Baseline Scenario plasmas were studied in DIII-D using krypton and xenon gases as a proxy for the tungsten that will be present in ITER. These impurities were chosen for having the same radiative loss rate Lz as tungsten would exhibit in the hotter ITER core. Results show that the scenario with these core radiators spans the range of impurity concentration and W radiated fraction expected for ITER, and up to 50% higher values, explored at zero injected torque, as well as 1 Nm and full co-torque injection with T ∼ 3 Nm. Stationary discharges with duration >2–4 τR are achieved with frad 30% leading to a reduction in confinement of ∼10%, and a comparison with real metal radiators in the same range of frad shows that the higher Lz at the lower temperatures in these plasmas yields too pessimistic results on the survivability and performance of this scenario in ITER. Simulations of ITER power balance including W radiation show that with concentration up to three times higher than in the DIII-D plasmas the scenario can be stationary, remaining at acceptable core radiated fraction values.

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diii-d高精度(タイトル一致)iter高精度(タイトル一致)

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ITERTungstenDIII-D

AIによる論文要約

DIII-Dにおける最初のタングステン放射研究 - ITER基準シナリオの実証
JAこの論文は、核融合分野の研究者や学生に向けて書かれています。ITER計画の実現に向けて、プラズマ中のタングステン挙動を理解することが重要であり、この研究はその一助となります。#ITER #タングステン #プラズマ放射 #閉じ込め特性 #核融合研究

この論文は、ITERで使用されるタングステンの放射特性を、DIII-Dプラズマで研究したものです。クリプトンとキセノンを用いて、ITERのコアプラズマと同様の放射特性を再現し、放射率や閉じ込め特性への影響を調べました。結果として、ITERでも許容できる範囲の放射率が得られ、タングステンの影響は過度に悲観的ではないことが分かりました。この研究は、ITER運転シナリオの検討に役立つと考えられます。

First tungsten radiation studies in DIII-D's ITER baseline demonstration discharges
ENThis paper is of interest to fusion researchers and engineers working on the development of the ITER tokamak and its operational scenarios, as it provides valuable insights into the behavior of tungsten impurities and their impact on plasma performance.#ITERBaseline #TungstenRadiation #FusionPlasmas

This paper explores the use of krypton and xenon gases as proxies for tungsten in ITER Baseline Scenario plasmas in DIII-D. The results show that the scenario can operate with up to 50% higher impurity concentrations and radiated fractions than expected in ITER, while maintaining stationary discharges. Simulations indicate that the ITER scenario can remain stable even with tungsten concentrations up to three times higher than in the DIII-D experiments.

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