Analysis of DIII-D neutral beam power systems for 10 second operation

Abstract

The neutral beam injector systems on the DIII-D tokamak are currently limited to 3 seconds of total beam on time with the existing beam line components. To achieve high performance discharges with a high fraction of non-inductive neutral beam current drive for pulse lengths longer than the resistive time, long pulse upgrades are planned for both the neutral beam line and the power supplies that drive it. The beam on time will be extended to 10 seconds to provide full drive throughout the tokamak shot.