Development of test system for arc power control of EAST NBI ion source

Neutral beam injection is recognized as one of the most effective methods for plasma heating. According to the requirements of physics experiments of EAST, two beam lines for Neutral beam injection have been built in 2014. In order to meet the diverse requirements of magnetic confinement experiments, the recent attempts have been carried out for arc power control of NBI ion source. The test system was added into control system of arc power. It provides a new method to smoothly change the arc power during a discharge. According to the experimental results of controlling arc power, the fesibility of varying the arc power was verified in the duration of discharge. Meanwhile, the test system achieves the remote setting of arc power parameters.