Impact of ELM control techniques on tungsten sputtering in the DIII-D divertor and extrapolations to ITER

被引：24

作者：

Abrams, T. ^{[1
]}

Unterberg, E. A. ^{[2
]}

Rudakov, D. L. ^{[3
]}

Leonard, A. W. ^{[1
]}

Schmitz, O. ^{[4
]}

Shiraki, D. ^{[2
]}

Baylor, L. R. ^{[2
]}

Stangeby, P. C. ^{[5
]}

Thomas, D. M. ^{[1
]}

Wang, H. Q. ^{[1
]}

机构：

[1] Gen Atom, San Diego, CA 92186 USA

[2] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[3] Univ Calif San Diego, Ctr Energy Res, La Jolla, CA 92093 USA

[4] Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 USA

[5] Univ Toronto, Inst Aerosp Studies, Toronto, ON M3H 5T6, Canada

来源：

PHYSICS OF PLASMAS | 2019年 / 26卷 / 06期

关键词：

JET-ILW; EROSION; ENERGY; MODEL; OPERATION; DEVICES;

D O I：

10.1063/1.5089895

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The free-streaming plus recycling model (FSRM) has recently been developed to understand and predict tungsten gross erosion rates from the divertor during edge localized modes (ELMs). In this work, the FSRM was tested against the experimental measurements of W sputtering during ELMs, conducted via fast neutral tungsten (WI) spectroscopy. Good agreement is observed using a variety of controlling techniques, including gas puffing, neutral beam heating, and plasma shaping to modify the pedestal stability boundary and, thus, the ELM behavior. ELM mitigation by pellet pacing was observed to strongly reduce W sputtering by flushing C impurities from the pedestal and reducing the divertor target electron temperature. No reduction of W sputtering was observed during the application of resonant magnetic perturbations (RMPs), in contrast to the prediction of the FSRM. Potential sources of this discrepancy are discussed. Finally, the framework of the FSRM is utilized to predict intra-ELM W sputtering rates in ITER. It is concluded that W erosion during ELMs in ITER will be caused mainly by free-streaming fuel ions, but free-streaming seeded impurities (N or Ne) may increase the erosion rate significantly if present in the pedestal at even the 1% level. Impurity recycling is not expected to cause significant W erosion in ITER due to the very low target electron temperature.

引用

页数：15

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