High energy electron deposition within vertical ports, during lower hybrid current drive on Tore Supra

Key plasma wall interaction issues towards steady state operation

“….) is underway [21][22][23][24] in order to optimize the plasma scenario for avoiding hot spots on PFCs, and developing control schemes.…”

Preliminary observations of hot spot for HT-7 long pulse discharges

“…Ref. [3]) describes a probable mechanism that fast electrons accelerated by the LHW firstly are trapped due to the ripple effect, and then pushed toward the top of the vessel by the curvature and gradient drifts. On HT-7, the area is now covered by a piece of graphite board.…”

“…Moreover, it could cause damages to the inner structure of the device. Since the next step device will be working in the steady state, this topic has been studied in many devices, including, JT-60U [1], LHD [2], Tore Supra [3], TRIAM-1M [4], TEXTOR [5], etc.…”

Steady state heat exhaust in Tore Supra: operational safety and edge parameters

“…But they are concentrated and locally the heat flux density can reach the same order of magnitude as from the plasma convection. These mechanisms are documented [11][12][13][14] but have new manifestations in the CIEL configuration. The lower hybrid (LH) heating causes populations of suprathermal particles, but emphasis is set here on the ion cyclotron resonance heating (ICRH) which has a strong influence on the heat pattern.…”