Overview of the DIII-D program and construction plans

Three additional long pulse gyrotrons have been ordered for the DIII-D program. They are required for current profile control and stabilization of the NTMs. The gyrotrons are scheduled to be installed during a 10-12-month facility enhancement period, which spans 2005-2006. At the same time a modification is scheduled to be made to the lower divertor to make it pump double null high triangularity plasmas, which are important for studying advanced tokamak plasmas. One of the four neutral beam lines will be rotated for counter injection, which will allow study of the quiescent double barrier mode with central co-rotation of the plasma and of the resistive wall mode with low rotation.