Commissioning results of the 0.5 MW/68 GHz/1.0 s gyrotron on HL-2A electron cyclotron resonance heating system

• A test stand for the test of gyrotron is introduced.
• Test results show that the output power of gyrotron has a close relation to the high voltage, magnet current and heater power.
• The measurement method of operation frequency and output power of gyrotron is introduced.

To obtain the optimum operation status of gyrotrons, it is necessary to commissioning the gyrotrons before EC wave injected into plasma for ECRH system on HL-2A tokamak. A test stand has been set up for conditioning the 0.5 MW/68 GHz/1.0 s gyrotrons. The specific test results of gyrotrons are described and discussed in this paper, which include measuring the beam profile by using burn paper at the outlet of MOU and calorimetric dummy load, testing the maximum output power and pulse width on dummy load and getting the dependence between output power and magnetic field current, filament power and high voltage powers. Meanwhile, the operation frequency of gyrotron is also measured in the test.