Neutral beam injection power feedback control method

A neutral beam injection power feedback control method, comprising the steps below:

• step 1, by analyzing ion optical characteristics of a hot cathode ion source, a best matching relationship of the ion source operating parameters is studied, and a best operation interval of the ion source is expanded to obtain the matching relationship between a probe and extraction system parameters;
• a set value interval of the probe under different beam energy is obtained by analyzing corresponding relationship between a set value of a probe signal and a beam divergence angle under different beam energy, which provides a reference database for dynamic control of beam power;
• step 2, linear dynamic control of injection power in a single injection cycle is completed by the reference database established in the step 1 so as to form an operation mode based on plasma feedback;
• and
• step 3, according to the dynamic control requirements of beam energy and beam power and characteristics of a neutral beam system, a corresponding function upgrade is performed on a control system, comprising the steps that, firstly, the real-time and accurate acquisition of various experimental parameters is realized based on the existing control system, and the probe signal, beam energy setting and deflection magnet setting are transmitted quickly and accurately according to the reference database;
• and various injection modes are realized according to the working characteristics of the neutral beam system and combined with the closed-loop control theory,
• wherein the step 2 comprises the steps below:
• step I, the beam energy is kept unchanged, the arc power is adjusted by changing the set value of the probe, and the dynamic adjustment of the injection power is realized within an optimal operation window interval, and ascending and descending of the injection power are realized under the condition of fixed beam energy:
• the dynamic feedback control of plasma density on the injection power is realized by the single-variable control;
• step II, the dynamic adjustment of the beam energy within a single injection period is realized;
• and also, the probe setting signal continuously changes following the adjustment of the beam energy, namely, the arc power tracking beam energy is automatically adjusted so as to enable the ion source to work under the condition of an optimal perveance.