First operation and validation of simulations for the divertor cryo-vacuum pump in Wendelstein 7-X

被引：0

作者：

Haak, V. ^{[1
]}

Dhard, C. P. ^{[1
]}

Boeyaert, D. ^{[2
]}

Braeuer, T. ^{[1
]}

Bykov, V. ^{[1
]}

Day, C. ^{[3
]}

Degenkolbe, S. ^{[1
]}

Ehrke, G. ^{[1
]}

Igitkhanov, J. ^{[3
]}

Khokhlov, M. ^{[1
]}

Kremeyer, T. ^{[1
]}

Nagel, M. ^{[1
]}

Naujoks, D. ^{[1
]}

Pietsch, M. ^{[1
]}

Pilopp, D. ^{[1
]}

Schlisio, G. ^{[1
]}

Strobel, H. ^{[3
]}

Tantos, C. ^{[3
]}

Varoutis, S. ^{[3
]}

Viebke, H. ^{[1
]}

Volzke, O. ^{[1
]}

机构：

[1] Max Planck Inst Plasma Phys, D-17491 Greifswald, Germany

[2] Univ Wisconsin Madison, Madison, WI USA

[3] Karlsruhe Inst Technol, D-76344 Eggenstein Leopoldshafen, Germany

来源：

FUSION ENGINEERING AND DESIGN | 2024年 / 208卷

关键词：

Cryo-vacuum pumping; Particle exhaust; Divertor neutral gas pressure; Stellarator Wendelstein 7-X; DESIGN;

D O I：

10.1016/j.fusengdes.2024.114671

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Ten cryo-vacuum pumps (CVPs) were installed in the subdivertor region of each island divertor in the stellarator Wendelstein 7-X (W7-X) and operated for the first time during the recently completed plasma campaign OP2.1. A pumping speed of 70 +/- 1 m(3)/s was measured during dedicated tests with known hydrogen gas injection. Based on a conductance model, the estimated pumping speed ranges from 86-93 m(3)/s for different sticking coefficients between 0.6 and 0.8. After completion of the initial tests the CVPs were operated successfully throughout the campaign, with regeneration performed once a week. Neutral gas pressures in the subdivertor in the range of 10(-4) mbar are well within the molecular flow regime and limit the particle exhaust capabilities of the CVPs. Simulations of the neutral gas pressure in the three-dimensional complex geometry of the subdivertor were performed using the DIVGAS code based on the direct simulation Monte Carlo method and a model implemented in the steady-state thermal package in ANSYS, which are in agreement with the measured values during plasma operation.

引用

页数：7

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