Impurity Injection to Plasmas with Improved Plasma Confinement
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Impurity gas injection effects were investigated in ELMy H-mode and reversed shear plasmas from viewpoints of divertor heat flux and power balance. In ELMy H-mode discharges with Ar seeding, the pedestal stored energy and good energy confinement was maintained as the radiation fraction, P_<rad>/P_<net> was increasing up to 0.88. The ELM energy deposition to the divertor normalized by the pedestal stored energy decreased moderately as a function of P_<rad>/P_<net> while ELM frequency was reduced significantly. With Ne seeding and moderate D_2 gas puffing rate, the radiative divertor plasma was produced in a reversed shear plasma with good plasma confinement H_<89> ～ 1.8. Radiation loss profiles and divertor heat flux profiles clearly revealed the divertor plasma detachment due to X-point MARFE.
- Journal of plasma and fusion research
Journal of plasma and fusion research 77(10), 1027-1034, 2001-10-25