Assessment of performance of the acceleration grid power supply of the ITER neutral beam injector

This paper deals with the analyses carried out to assess the performance of the acceleration grid power supply of the ITER neutral beam injector; a model of the power supply is setup and simulations are run in both normal and anomalous operating conditions, with the aim of demonstrating the fulfilment of the requirements and to give inputs for the design of the equipments. The dynamic performance and the output voltage ripple are studied in normal operation on the basis of a conceptual design of the system; anomalous operating conditions, such as breakdown of the grids and sudden interruption of the beam current, are also analyzed and discussed.