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.
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页数：7
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