Characterisation of the scrape-off layer in JET-ILW deuterium and helium low-confinement mode plasmas

• DOI: 10.1016/j.nme.2024.101657
• Publication Date: 2024-04-21T03:12:23Z
• Authors: D. Rees; M. Groth; S. Aleiferis; S. Brezinsek; M. Brix; I. Jepu; K.D. Lawson; A.G. Meigs; S. Menmuir; K. Kirov; P. Lomas; C. Lowry; B. Thomas; A. Widdowson; P. Carvalho; E. Delabie
• Keywords: Effective radiated power; Langmuir Probe

Langmuir probe measurements in neutral beam injection (NBI) heated, low-confinement mode plasmas JET ITER-like wall showed that the current to divertor targets, Idiv, helium (He) was up 70% lower on low-field side (LFS) than otherwise identical deuterium (D) plasmas. The edge plasma density at which rollover of Idiv occurred i.e. onset detachment, 10% higher He both LFS and high-field (HFS). increases by 25% for when NBI power 1MW 5MW. total radiated similar D densities below rollover. At above density, from within separatrix are He, reducing across subsequently Idiv,LFS. In plasmas, peak observed confined region X-point tomographic reconstructions bolometry.