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.

中性束注入（Neutral beam injection, NBI）被公认为等离子体加热最有效的手段之一。针对EAST装置物理实验的需求，相关团队于2014年建成两套中性束注入束线。为满足磁约束实验的多样化需求，近期针对NBI离子源的弧功率控制开展了研究尝试。该测试系统已集成至弧功率控制系统中，可为放电过程中弧功率的平滑调节提供全新方案。通过弧功率控制的实验结果，验证了放电过程中弧功率可调的可行性。同时，该测试系统还实现了弧功率参数的远程设定功能。