SOL PLASMA PROFILES UNDER RADIATIVE AND DETACHED DIVERTOR CONDITIONS IN JT-60U

Radial profiles of electron density n(e,mid) temperature T-e,T-mid, an d ion temperature T-i,T-mid in the scrape-off layer (SOL) were investi gated under radiative and detached divertor conditions in L-mode disch arges. Since the ratio of T-i,T-mid/T-e,T-mid is about 3, the ion pres sure is dominant at the midplane, and plays an important role in the p ressure balance between the midplane and the divertor targets. Effect of the connection length on the decay lengths of n(e,mid) and T-e,T-mi d, lambda(Te) and lambda(Te), was determined in two SOL regions. At th e same time, lambda(Ti) was compared to lambda(Te) and lambda(ne).lamb da(ne), lambda(Te) and lambda(Ti) increase with the connection length. During the X-point MARFE, lambda(Te), lambda(ne), and lambda(Ti) incr ease substantially with a reduction in T-e,T-mid, T-i,T-mid and n(e,mi d) at the plasma edge and in the first SOL, due to the penetration of the maximum radiation region into the main plasma near the X-point.