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Options for a high heat flux enabled helium cooled first wall for DEMO

Arbeiter, Frederik; Chen, Yuming; Ghidersa, Bradut-Eugen; Klein, Christine; Neuberger, Heiko; Ruck, Sebastian; Schlindwein, Georg; Schwab, Florian; von der Weth, Axel

Abstract:
Helium is considered as coolant in the plasma facing first wall of several blanket concepts for DEMO fusion reactors, due to the favorable properties of flexible temperature range, chemical inertness, no activation, comparatively low effort to remove tritium from the gas and no chemical corrosion. Existing blanket designs have shown the ability to use helium cooled first walls with heat flux densities of 0.5 MW/m2. Average steady state heat loads coming from the plasma for current EU DEMO concepts are expected in the range of 0.3 MW/m2. The definition of peak values is still ongoing and depends on the chosen first wall shape, magnetic configuration and assumptions on the fraction of radiated power and power fall off lengths in the scrape off layer of the plasma. Peak steady state values could reach and excess 1 MW/m2. Higher short-term transient loads are expected.

Design optimization approaches including heat transfer enhancement, local heat transfer tuning and shape optimization of the channel cross section are discussed. Design points to enable a helium cooled first wall capable to sustain heat flux densities of 1 MW/m2 at an ... mehr


Zugehörige Institution(en) am KIT Institut für Neutronenphysik und Reaktortechnik (INR)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.1016/j.fusengdes.2017.04.083
ISSN: 0920-3796, 1873-7196
KITopen ID: 1000069606
HGF-Programm 31.03.06; LK 01
Erschienen in Fusion engineering and design
Band 119
Seiten 22–28
Schlagworte Plasma Facing Components; First Wall; Helium; Thermo-mechanics; Heat transfer enhancement; Design optimization
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