Calorimetric power measurements in the EAST ECRH system

Abstract

In this paper, the calorimetric power measurement method for electron cyclotron resonance heating system on EAST are presented. This method requires measurement of the water flow through the cooling circuits and the input and output water temperatures in each cooling circuit. Usually, the inlet water temperature is controlled to be stable to get more accurate results. The influence of the inlet water temperature change on the measurement results is analyzed for the first time in this paper. A novel temperature calibration method is proposed also. This kind of calibration method is accurate and effective, and can be easily implemented.

Millimeter-wave detector for gyrotron power monitoring

“…The RF power measurement of the gyrotron [2] is one of the key issues in the operation of electron cyclotron resonance heating system. There are two methods for measuring gyrotron power, namely the calorimetric method [3] and the detector-based method for real-time power monitoring [4]. For the detector-based method, the power monitor bends are used to leak out a little incident RF power and reflected RF power to the detectors, which will transform the wave power into voltage signal according to the sensitivity curve of the detector.…”

Gyrotron anode voltage control in EAST ECRH system

“…The anode voltage is an important parameter that affects the gyrotron output power [8]. We have tested the corresponding change in gyrotron output power [9] by controlling the anode voltage.…”

Study of a 105 GHz short-pulse dummy load for the electron cyclotron resonance heating system with the quasi-optical method

“…Furthermore, the ratio C load can be measured by an individual test with the known power supply. Then the ratio C load can be applied to the high-power test and help to calculate the exact power of the incident wave [2,16]. The ratio C load will be influenced by the environmental factors such as temperature and flow rate [2].…”