Abstract
Degradation of energy and particle confinement was investigated with a high-recycling divertor in ELMy H-mode plasma on JT-60U with high-power neutral beam injection of 18 - 19 MW; the plasma parameters were fixed at . The reduction in global energy confinement time was due to a reduction in the stored energy of fast ions with increasing plasma density, while the thermal energy confinement time decreased slightly from 0.088 - 0.092 s to 0.083 s under an attached divertor condition. On the other hand, the global particle confinement time decreased greatly from 0.13 to 0.08 s due to increase in neutral influx from the divertor. Combining the results, decreased from 1.5 to 1. Increased neutral density and enhanced asymmetry in the poloidal direction had less effect on maintaining the edge transport barrier as long as the attached divertor condition was maintained.
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