7th Asia-Pacific Conference on Plasma Physics, 12-17 Nov, 2023 at Port Messe Nagoya

A new electromagnetic probe array diagnostic system for analyzing electrostaticand magnetic fluctuations on EAST

H. Lan1, T. H. Shi2, N. Yan2, X.Q. Li2, S. Li2, R. Chen2, M.Y. Duan2, G. H. Hu2, L. N. Liu2, M.
Chen2, L. X. Chen2, Z. K. Lu2, Y. Y. Zheng2, Z. Yuan2, Y. Wang2, Z.H. Xu2, L. Q. Xu2, P. F. Zi2, L.
Chen2, S. C. Liu2, D. G. Wu2, G. F. Ding2, L. Y. Meng2, Z. C. Wang2, Q. Zang2, L. Wang2, G.S. Xu2
1
Institute of Fusion Science, School of Physical Science and Technology, Southwest Jiaotong
University, 2 Institute of Plasma Physics, Chinese Academy of Sciencese-mail (speaker): henglan@swjtu.edu.cn
A new electromagnetic probe array (EMPA) diagnosticsystem has been developed on EAST [1,2]. Thisdiagnostic system consists of two subsystems: i.e., alow-field side electromagnetic probe array (LFS-EMPA)[1] and high-field side magnetic probe array(HFS-MPA)[2]. Each magnetic probe of the EMPAdiagnostic can measure three dimensional magnetic
fluctuations, which provides additional toroidal magnetic
fluctuation measurement ability comparing with regularmagnetic probe on EAST. The LFS-EMPA diagnostic
system consists of 24 magnetic probes and 20
electrostatic probes, which can resolve fluctuations withfrequency lower than 700 kHz, nearly one times higher
than the fluctuation frequency resolution of EAST
conventional high-frequency magnetic probe; its toroidal
mode number measuring range of -112 ≤≤ 112 isgreatly improved comparing with the conventional
magnetic probe with toroidal mode number resolution of-8 ≤≤ 8; the electrostatic probe array is fixed near
the first wall and about 12 cm behind the limiter, which
provides a new tool for studying the phenomenon oflarge eruption of particles and heat from plasma in atransient time. The HFS-MPA diagnostic system consistsof 12 three-dimensional magnetic probes, which have theidentical structure to the LFS-EMPA magnetic probe.
The HFS-MPA can resolve magnetic fluctuations withfrequency lower than 700 kHz, which is also higher thanthe HFS conventional magnetic probe; the carefully
designed arrangements of the HFS-MPA can contributeto the mode structure studies on HFS. The engineering
details of the EMPA diagnostic, including the mechanicalsystem, the electrical system, the acquisition and controlsystem, and the effective area calibration and frequency
response analysis, are presented. The preliminary
applications of the EMPA in EAST L-mode and H-mode
discharges have demonstrated that the EMPA works wellfor providing information on the magnetic andelectrostatic fluctuations and can contribute to deeper
physical analysis in future EAST experiments.
This work is supported by National Magnetic
Confinement Fusion Energy R&D Program of China(Nos. 2019YFE03030000 and 2022YFE03020004),
National Natural Science Foundation of China (Nos.
12105187, 11905250 and 11975275), China Postdoctoral
Science Foundation (No. 2021M702245), and Users withExcellence Program of Hefei Science Center, CAS (No.
2021HSC-UE014).

References[1] H. Lan, et al., 2023 Plasma Sci. Technol. 25 075105[2] H. Lan, et al., New high-field side magnetic probearray system for three-dimensional magnetic fluctuation
measurements on EAST (2023, to be submitted)

Figure 1. Schematic of the EMPA diagnostic system: (a)low-field side electromagnetic probe array (LFS-EMPA)
and (b) high-field side magnetic probe array(HFS-MPA).