Plasma shape control assessment for JT-60SA using the CREATE tools

This paper deals with the plasma shape control problem in JT-60SA. An assessment of the plasma shape control performance is presented, aimed at the definition of an optimal set of gaps to be controlled. The control approach considered for the assessment is based on the eXtreme Shape Controller, since such an approach permits to control, in a least mean square sense, a number of shape descriptors that is larger than the number of poloidal field coils.The result of analysis suggests that a set of about 20 gaps equally spaced along the plasma boundary permits to control the shape with a steady-state root-mean square error of less than 1 cm during the flattop of JT-60SA Scenario 2, in the presence of a set of relevant disturbances