Design and test of voltage and current probes for EAST ICRF antenna impedance measurement

Jianhua WANG (王健华); Gen CHEN (陈根); Yanping ZHAO (赵燕平); Yuzhou MAO (毛玉周); Shuai YUAN (袁帅); Xinjun ZHANG (张新军); Hua YANG (杨桦); Chengming QIN (秦成明); Yan CHENG (程艳); Yuqing YANG (杨宇晴); Guillaume URBANCZYK; Lunan LIU (刘鲁南); Jian CHENG (程健)

doi:10.1088/2058-6272/aaa7ea

Plasma Science and Technology > 2018 > 20(4): 45603-045603. > DOI: 10.1088/2058-6272/aaa7ea

Jianhua WANG (王健华), Gen CHEN (陈根), Yanping ZHAO (赵燕平), Yuzhou MAO (毛玉周), Shuai YUAN (袁帅), Xinjun ZHANG (张新军), Hua YANG (杨桦), Chengming QIN (秦成明), Yan CHENG (程艳), Yuqing YANG (杨宇晴), Guillaume URBANCZYK, Lunan LIU (刘鲁南), Jian CHENG (程健). Design and test of voltage and current probes for EAST ICRF antenna impedance measurement[J]. Plasma Science and Technology, 2018, 20(4): 45603-045603. DOI: 10.1088/2058-6272/aaa7ea

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Design and test of voltage and current probes for EAST ICRF antenna impedance measurement

1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China 2 University of Science and Technology of China, Hefei 230026, People’s Republic of China 3 CEA, IRFM, F-13108 Saint Paul-lez-Durance, France

Funds: This work was supported by: (1) National Natural Science Foundation of China under grant Nos. 11575237, 11775258, 11675213, 11375235 and 11375236; (2) National key research and development program (grant Nos. 2016YFA0400600 and 2016YFA0400601); (3) International Scientific and Technological Cooperation Project of Anhui (grant No. 1704e1002207); (4) the National Magnetic Confinement Fusion Science Programme of China (grant Nos. 2015GB101001 and 2013GB106001B); (5) JSPSNRF-NSFC A3 Foresight Program in the field of Plasma Physics (NSFC No. 11261140328).

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Received Date: October 09, 2017

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Abstract

Abstract

On the experimental advanced superconducting tokamak (EAST), a pair of voltage and current probes (V/I probes) is installed on the ion cyclotron radio frequency transmission lines to measure the antenna input impedance, and supplement the conventional measurement technique based on voltage probe arrays. The coupling coefficients of V/I probes are sensitive to their sizes and installing locations, thus they should be determined properly to match the measurement range of data acquisition card. The V/I probes are tested in a testing platform at low power with various artificial loads. The testing results show that the deviation of coupling resistance is small for loads R_L>2.5 Ω, while the resistance deviations appear large for loads R_L<1.5 Ω, which implies that the power loss cannot be neglected at high VSWR. As the factors that give rise to the deviation of coupling resistance calculation, the phase measurement error is the more significant factor leads to deleterious results rather than the amplitude measurement error. To exclude the possible ingredients that may lead to phase measurement error, the phase detector can be calibrated in steady L-mode scenario and then use the calibrated data for calculation under H-mode cases in EAST experiments.
- EAST,
- ICRF,
- antenna,
- impedance

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References (13)

References

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Design and test of voltage and current probes for EAST ICRF antenna impedance measurement