Abstract
Electron Cyclotron Resonance Heating (ECRH) is one of the main auxiliary heating systems for HL-2A tokamak. The ECRH system with total output power 5MW has been equipped on HL-2A which include 6 sets of 0.5MW/1.0s at a frequency of 68GHz and 2 sets of 1MW/3s at a frequency of 140GHz. The power is one of important parameters in ECRH system. In this paper, the method for measuring the power of ECRH system on HL-2A is introduced which include calorimetric techniques and directional coupler. Calorimetric techniques is an existing method, which is used successfully in ECRH commissioning and experiment, and the transmission efficiency of ECRH system is achieved by measuring the absorbed microwave power in the Match Optical Unit (MOU), gyrotron output window and tours window of the EC system use this method. Now base on the theory of electromagnetic coupling through apertures, directional couplers are being designed, which is a new way for us.
Highlights
As one of the main heating system of many fusion experimental devices, including ITER, Electron Cyclotron Resonance Heating (ECRH) has been widely applied on plasma heating, non-inductive current drive, plasma start-up, current profile control and MHD stabilization [1, 2]
The ECRH system on HL-2A has equipped with six 0.5MW gyrotrons at 68GHz and two 1MW gyrotrons at 140GHz, the total output power is 5MW
The ECRH system on HL-2A has been equipped with six 0.5MW gyrotrons at frequency of 68GHz and two 1MW gyrotrons at 140GHz
Summary
As one of the main heating system of many fusion experimental devices, including ITER, ECRH has been widely applied on plasma heating, non-inductive current drive, plasma start-up, current profile control and MHD stabilization [1, 2]. The ECRH system on HL-2A has equipped with six 0.5MW gyrotrons at 68GHz and two 1MW gyrotrons at 140GHz, the total output power is 5MW. The power is one of the important parameters in ECRH system. Calorimetric methods has been used for measuring power in ECRH commissioning and experiment on HL-2A. Use this method, the microwave energy is converted into water energy which can be calculated by measuring water temperature increment. Because the time delays of water temperature acquisition, the power information is not in real time. Directional couplers are being designed which can measure the power in real time and can be used to monitor the gyrotron oscillation status
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