Density position impacts pped in AUG and C-Mod M.
Description: Density position impacts pped in AUG and C-Mod M. Dunne et al., IAEA FEC, EXP8-2 1 Degradation of pedestal top in AUG and C-Mod correlated with outward shift of density profile Can have different causes: AUG: linked with high density
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slide1. Density position impacts pped in AUG and C-Mod M. Dunne et al., IAEA FEC, EX/P8-2 1 Degradation of pedestal top in AUG and C-Mod correlated with outward shift of density profile
Can have different causes:
AUG: linked with high density structure in high-field side SOL (the HFSHD) – proposed to cause diffusive fuelling near separatrix and shift density profile outwards
HFSHD removed by nitrogen seeding -> confinement “improvement”
C-Mod: linked with outer divertor detachment (no observed effect of a similar high density SOL structure on confinement)
Multiple possible origins of the shift point to the requirement of detailed understanding of plasma fuelling<br>
Can have different causes:
AUG: linked with high density structure in high-field side SOL (the HFSHD) – proposed to cause diffusive fuelling near separatrix and shift density profile outwards
HFSHD removed by nitrogen seeding -> confinement “improvement”
C-Mod: linked with outer divertor detachment (no observed effect of a similar high density SOL structure on confinement)
Multiple possible origins of the shift point to the requirement of detailed understanding of plasma fuelling<br>