Variation of divertor plasma parameters with divertor depth for H-mode discharges in DIII-D.

摘要

We report here the results of experiments aimed at quantifying the advantages of increasing the X-point to target-plate distance in a diverter tokamak operating with H-mode confinement. Larger distances should lower the peak electron temperature at the target plates, thereby reducing sputtering and lowering the impurity concentration in the care plasma. When gas puffing is used to reduce the diverter heat flux, extra field-line length may increase the volume available for radiation and increase gas isolation between the core and diverter regions.