Design and physics basis for the upcoming DIII-D SAS-VW campaign to quantify tungsten leakage and transport in a new slot divertor geometry

被引：24

作者：

Abrams, T. ^{[1
]}

Sinclair, G. ^{[1
]}

Nichols, J. H. ^{[2
,3
]}

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

Donovan, D. C. ^{[3
]}

Duran, J. ^{[3
]}

Elder, J. D. ^{[4
]}

Glass, F. ^{[1
]}

Grierson, B. A. ^{[5
]}

Guo, H. Y. ^{[1
]}

Hall, T. ^{[1
]}

Ma, X. ^{[6
]}

Maurizio, R. ^{[6
]}

McLean, A. G. ^{[7
]}

Murphy, C. ^{[1
]}

Nguyen, R. ^{[1
]}

Rudakov, D. L. ^{[8
]}

Stangeby, P. C. ^{[4
]}

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

Zamperini, S. A. ^{[1
]}

机构：

[1] Gen Atom, San Diego, CA 92121 USA

[2] Oak Ridge Natl Lab, POB 2009, Oak Ridge, TN 37831 USA

[3] Univ Tennessee, Knoxville, TN 37996 USA

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

[5] Princeton Plasma Phys Lab, Princeton, NJ 08536 USA

[6] Oak Ridge Associated Univ, Oak Ridge, TN 37830 USA

[7] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[8] Univ Calif San Diego, La Jolla, CA 92093 USA

来源：

PHYSICA SCRIPTA | 2021年 / 96卷 / 12期

关键词：

tungsten; DIII-D; divertors; SOLPS; DIVIMP; spectroscopy; tokamaks; EROSION;

D O I：

10.1088/1402-4896/ac3c5f

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A set of experiments are planned to exploit the high SOL collisionality enabled by a tightly baffled slot divertor geometry to suppress tungsten leakage in DIII-D. A toroidal row of graphite tiles from the Small Angle Slot (SAS) divertor is being coated with 10-15 mu m of tungsten. New spectroscopic viewing chords with in-vacuo optics will measure the W gross erosion source from the divertor surface with high spatial and temporal resolution. In parallel, the bottom of the SAS divertor is changed from a flat to a 'V' shape. New SOLPS-ITER/DIVIMP simulations conducted with drifts using the planned 'V' shape predict a substantial reduction in W sourcing and SOL accumulation in either B x backward difference B direction relative to either the old SAS divertor shape or the open, lower divertor. Dedicated studies are planned to carefully characterize the level of W sourcing, leakage, and scrape-off-layer (SOL) accumulation in DIII-D over a wide range of plasma scenarios. Various actuators will be assessed for their efficacy in further reducing high-Z impurity sources and leakage from the slot divertor geometry. This coupled code-experiment validation effort will be used to stress-test physics models and build confidence in extrapolations to advanced, high-Z divertor geometries for next-step devices.

引用

页数：7

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