The evolution of the bound particle reservoir in Wendelstein 7-X and its influence on plasma control

Abstract The investigation of fuel retention in fusion experiments is important view plasma density control as well tritium inventory for future reactors. We present a first gas balance the stellarator Wendelstein 7-X with its inertially cooled graphite divertor. used to estimate wall and it found that plays an dynamic role, absorbing or releasing particles depending on conditions. Several different scenarios are presented effect fueling heating assessed. find record duration experiment 100 s required previous shorter plasmas be successfully conducted.