Using numerical simulation, a first estimate is made of power fluxes caused by radio-frequency sheaths on plasma facing components surrounding the ITER Ion Cyclotron Range of Frequencies wave launcher. Three toroidal strap phasings were considered, and four plasma scenarios covering a broad range of Scrape-Off Layer densities. Parallel heat fluxes up to ∼16 MW/m2 are obtained, localized in poloidal peaks whose radial extension (initially 4–35 mm) increases when nearby flux tubes are coupled by exchanging RF currents. Quantitative results strongly depend on the local density, both via the unperturbed input profiles and via subsequent RF-induced modifications by E × B0 convection. Sources of uncertainty and aspects requiring further validation are identified.

Estimated RF sheath power fluxes on ITER plasma facing components / Colas, L; Milanesio, Daniele; Faudot, E; Goniche, M; Loarte, A.. - In: JOURNAL OF NUCLEAR MATERIALS. - ISSN 0022-3115. - STAMPA. - 390-391:(2009), pp. 959-962. [10.1016/j.jnucmat.2009.01.248]

Estimated RF sheath power fluxes on ITER plasma facing components

MILANESIO, DANIELE;
2009

Abstract

Using numerical simulation, a first estimate is made of power fluxes caused by radio-frequency sheaths on plasma facing components surrounding the ITER Ion Cyclotron Range of Frequencies wave launcher. Three toroidal strap phasings were considered, and four plasma scenarios covering a broad range of Scrape-Off Layer densities. Parallel heat fluxes up to ∼16 MW/m2 are obtained, localized in poloidal peaks whose radial extension (initially 4–35 mm) increases when nearby flux tubes are coupled by exchanging RF currents. Quantitative results strongly depend on the local density, both via the unperturbed input profiles and via subsequent RF-induced modifications by E × B0 convection. Sources of uncertainty and aspects requiring further validation are identified.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2302997
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo