Method for measuring plasma density of throttle hole region of hollow cathode

A method for measuring plasma density of a throttle hole region of a hollow cathode relates to the field of a hollow cathode and is used for solving the problem of low measuring accuracy due to hole region size influence of the hollow cathode in a traditional method for measuring hole region plasma of the hollow cathode. The method for measuring the plasma density of the throttle hole region of the hollow cathode comprises the following steps of 1, acquiring a relation between the plasma density and air pressure of the cathode according to a fluid theory; and 2, allowing the cathode to normally work, measuring a working parameter of the hollow cathode, and acquiring the hole region plasma density according to the relation, obtained in the step 1, between the plasma density and the air pressure of the cathode. The method is very simple in calculation process and is free from the hole region size influence of the hollow cathode, the parameter which cannot be directly acquired is measured by an indirect means, and meanwhile, very high measurement accuracy is ensured.