6533b872fe1ef96bd12d3153

RESEARCH PRODUCT

Improved EDGE2D-EIRENE simulations of JET ITER-like wall L-mode discharges utilising poloidal VUV/visible spectral emission profiles

Jet-efda ContributorsS. BrezinsekC. F. MaggiG. CorriganP. BeloC. MarchettoP. DrewelowD. HartingA. G. MeigsM.f. StampS. WiesenA. CzarneckaE. DelabieSheena MenmuirK. D. LawsonM. GrothI. Książek

subject

Nuclear and High Energy PhysicsJet (fluid)ta214TokamakMaterials scienceta114SpectrometerDivertorta221BolometerEffective radiated power01 natural sciences010305 fluids & plasmaslaw.inventionNuclear Energy and EngineeringlawSputtering0103 physical sciencesGeneral Materials ScienceSpontaneous emissiontokamaksAtomic physics010306 general physicsta218

description

A discrepancy in the divertor radiated powers between EDGE2D-EIRENE simulations, both with and without drifts, and JET-ILW experiments employing a set of NBI-heated L-mode discharges with step-wise density variation is investigated. Results from a VUV/visible poloidally scanning spectrometer are used together with bolometric measurements to determine the radiated power and its composition. The analysis shows the importance of D line radiation in contributing to the divertor radiated power, while contributions from D radiative recombination are smaller than expected. Simulations with W divertor plates underestimate the Be content in the divertor, since no allowance is made for Be previously deposited on the plates being re-eroded. An improved version of EDGE2D-EIRENE is used to test the importance of the deposited layer in which the sputtering yield from supposed pure Be divertor plates is reduced to match the spectroscopic signals, while keeping the sputtering yield for the Be main chamber walls unchanged.

yearjournalcountryeditionlanguage
2015-08-01Journal of Nuclear Materials
https://doi.org/10.1016/j.jnucmat.2014.11.111