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Optimization of pumping efficiency and divertor operation in DEMO

Varoutis, S.; Bonelli, F.; Day, C.; Igitkhanov, Y.

In the present work a sensitivity analysis of the pumping performance of a standard divertor design for two extreme dome cases (with and without) and different pumping port locations is performed. Such an investigation re-assesses the role of the divertor dome in the design of a DEMO divertor cassette. The non-linear neutral gas flow in the private flux and sub-divertor region is modeled based on the Direct Simulation Monte Carlo (DSMC) method, which takes into account the intermolecular collisions as well as the interaction of the molecules with the stationary walls. For this specific configuration, three different pumping port locations, namely in the low and high field bottom sides of the sub-divertor and directly under the dome haven been chosen. It is shown that the optimum pumping port location is found to be directly under the dome, since the pumped particle flux is increased by a factor 2–3 compared to the one, where the port is located inside the low and high field side divertor “shoulders”, respectively. In addition, the divertor dome physically restricts the conductance between the private flux region and the main chamber, enabling the compression of the neutral gas. ... mehr

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DOI: 10.5445/IR/1000069532
DOI: 10.1016/j.nme.2017.04.001
Zitationen: 3
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 2352-1791
KITopen-ID: 1000069532
HGF-Programm 31.03.01 (POF III, LK 01)
Erschienen in Nuclear materials and energy
Band 12
Seiten 668-673
Schlagworte DEMO, Divertor, Fueling, Pumping efficiency, DSMC method
Nachgewiesen in Scopus
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