Fuel retention and recovery after disruptive shots in EAST

Abstract

Disruption was proposed for controlling long-term fuel retention since the subsequent increase the post-discharge wall outgassing could help in decreasing the fuel retention on the wall after discharges. The amount and temporal behavior of fuel retention and recovery have been studied after non-disruptive and disruptive shots in EAST. The retention of disruptive shots is lower than non-disruptive shots, and sometimes the outgassing of disruption leads to negative retention. The recovered particles approximately linearly increased with the electron density and injected particles after disruption. And the post-discharge recovered particles increased with the stored energy for both disruptive and non-disruptive shots, but the recovered particles after disruptive shots are more than non-disruptive shots. The recovered particles in 10s after discharge for disruptive shots is 3∼4 times higher than non-disruptive shots, and then the behavior of fuel recovery is similar for both non-disruptive and disruptive shots.