Collisional vertical f -asymmetry effect

P Maget (1, 2) , J Frank (2, 3) , P Manas (2) , R Dumont (2) , T Nicolas (4) , J-F Artaud (2) , C Bourdelle (2) , L Colas (2) , M Goniche (2) , O Agullo (3) , X Garbet (2) , H Lütjens (4)

1 CEA - Commissariat à l'énergie atomique et aux énergies alternatives
2 IRFM - Institut de Recherche sur la Fusion par confinement Magnétique
3 PIIM - Physique des interactions ioniques et moléculaires
4 CPHT - Centre de Physique Théorique [Palaiseau]

The use of metallic walls as plasma facing components in tokamaks puts severe constraints on the control of impurity contamination. Heavy impurities like Tungsten are of particular concern due to the high level of radiative losses they can induce. Moreover, their high sensitivity to neoclassical transport mechanisms exacerbated by toroidal rotation or electrostatic potential asymmetry generally explains experimental cases of strong accumulation in the plasma core. The poloidal distribution of the impurity modulates the amplitude of this neoclassical transport [Angioni14], with an asymmetry that often leads to enhancement, but that can also result in a reduction of the flux

Domains: Physics [physics]; Physics [physics]; Plasma Physics [physics.plasm-ph]

P Maget, J Frank, P Manas, R Dumont, T Nicolas, et al.. Collisional vertical f -asymmetry effect. IAEA FEC 2020 - The 28th IAEA Fusion Energy Conference, May 2021, Nice (E-conference), France. . ⟨cea-03249444⟩