Optical design and synthetic analysis of the electron cyclotron emission imaging diagnostic of HL-2M tokamak

Jiang, Min; Zhu, Yilun; Yu, Xin; Shi, Zhongbing; Luhmann, Jr., N. C.; Yang, Zhoujun; Deng, Weichu; Yang, Zengchen; Zhou, Yu; Tong, Ruihai

doi:10.1016/j.fusengdes.2023.113570

Optical design and synthetic analysis of the electron cyclotron emission imaging diagnostic of HL-2M tokamak

Journal Article · Mon Feb 20 00:00:00 EST 2023 · Fusion Engineering and Design

DOI:https://doi.org/10.1016/j.fusengdes.2023.113570· OSTI ID:2419541

Jiang, Min ^[1]; Zhu, Yilun ^[2]; Yu, Xin ^[3]; Shi, Zhongbing ^[3]; Luhmann, Jr., N. C. ^[2]; Yang, Zhoujun ^[4]; Deng, Weichu ^[3]; Yang, Zengchen ^[3]; Zhou, Yu ^[3]; Tong, Ruihai ^[3]

Southwestern Institute of Physics, Chengdu (China); OSTI
University of California, Davis, CA (United States)
Southwestern Institute of Physics, Chengdu (China)
Huazhong University of Science and Technology, Wuhan (China)

The electron cyclotron emission imaging (ECEI) diagnostic is a powerful tool to study the MHD and turbulent transport in magnetically confined fusion plasmas. In this work, the optical system including the local oscillator (LO) coupling and radio frequency (RF) receiving optics, has been designed and analyzed for the HL-2M ECEI diagnostic. The LO optics can illuminate the antenna array and drive the mixer diode to work efficiently, with more than 36% of the beam intensity for the channels which probe the plasma edge relative to those of channels which probe the plasma core. The RF optics aims at guiding the plasma emission signal to the antenna array. To meet different physical requirements, three types of field of view have been achieved for the plasma imaging, with zoom factors of around 1, 1.5 and 2, respectively. The focal surfaces are almost flat, with a maximum off-mapping (defined as the radial distance between the beam waists of the lower-/uppermost antennas and electron cyclotron emission layer) less than 2.5 cm, which can match the electron cyclotron emission layer quite well and suppress the image distortion in the plasma edge region. Furthermore, the impact of possible vibrations and installation error on the focal plane has been evaluated. In addition, the predefined MHD and turbulence perturbations are well reproduced by combining the optical simulation results and synthetic ECEI modeling, which further verifies the good performance of the RF optics.

View Accepted Manuscript (DOE)

Research Organization:: University of California, Davis, CA (United States)

Sponsoring Organization:: National MCF Energy R&D Program of China; National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC); Young Elite Scientists Sponsorship Program

Grant/Contract Number:: FG02-99ER54531

OSTI ID:: 2419541

Journal Information:: Fusion Engineering and Design, Journal Name: Fusion Engineering and Design Journal Issue: C Vol. 191; ISSN 0920-3796

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Optical design and synthetic analysis of the electron cyclotron emission imaging diagnostic of HL-2M tokamak

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