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In order to examine the effect of radiation power loss due to impurity gas puff in divertor plasma, we calculated time evolution of impurity ion densities and electron temperature for several cases with Ne gas puff rates 1012 and 1013 cm?3 s?1  during 0.01 s and initial electron temperature 10-300 eV for a plasma with electron density 1013 cm?3 with a one zone model. We found that the electron temperature decreases less than 1 eV for the cases with gas puff rate 1013 cm?3 s?1, independent of initial electron temperature and in this case we expect plasma detachment. Detailed conditions for plasma detachment should also depend on time history of radiation power

Effect of Radiation Power Loss due to Impurity Gas Puff on Divertor Plasma