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10-15 May 2021
Virtual Event
Europe/Vienna timezone
The Conference will be held virtually from 10-15 May 2021

Recent progress and upgrade plan of KTX reversed field pinch

10 May 2021, 14:00
4h 55m
Virtual Event

Virtual Event

Overview Poster Overview OV-OV/P Overview Posters

Speaker

Prof. Tao Lan (University of Science and Technology of China)

Description

The Keda Torus eXperiment (KTX) is a new built middle-size reversed field pinch (RFP) device at the University of Science and Technology of China. The mission of KTX is complementary to the existing international Revered Field Pinch (RFP) facilities. The plasma wall interactions, transport in different boundary conditions, the single helicity (SH) state are the main physics aspects of KTX. The wall condition has been optimized for higher plasma parameters, including plasma current and discharge period. Advanced diagnostics, including the terahertz interferometer, Thomson scattering system, double-foil soft x-ray imaging, edge capacitive probe and multi-channel spectrograph system, have been developed for the normal operation and physical analysis at present stage.

After getting the funding from the Ministry of science and technology, the Phase II upgrade of KTX starts and it focuses on the operation capacity promotion in three respects: the confinement improvement, the high temperature plasma state and the 3D MHD active control. The task is divided into sub objectives during the upgrading: 1) To improve the plasma current up to or even more than 1MA. The capacitor banks of the KTX pulse power supply will be extremely upgraded. 2) To extend the plasma discharge period longer than 100ms. The equilibrium field control system and external 3D active feedback control system, including the saddle coils system covered on the outer surface of the vacuum chamber and the error field correction coils around the poloidal gaps, are well developed. 3) To sustain the reversed field stateover 40ms. A compact torus injection system (KTX-CTI) has been developed and installed on the middle plane of KTX, using which the magnetic field penetration process of fueling, external momentum and helicity injection are studied in detail and related with the magnetic reconnection. KTX will become a pre-research platform to test the high-frequency and long-distance CTI, including the performance of the injector machine and its power supply, for application on future fusion devices such as ITER and CFETR. 3D physics in the QSH state, density limit, disruption and electromagnetic turbulence will be the main physics research priorities during and after the phase II upgrade of the KTX machine with improved confinement plasmas.

The work is supported by the National Magnetic Confinement Fusion Science Program of China under Grant No. 2017YFE0301700 and the National Natural Science Foundation of China under Grant Nos. 11635008, 11375188 and 11975231.

References
[1]. Wandong Liu, et al. An overview of diagnostic upgrade and experimental progress in the KTXC, Nucl. Fusion 59 112013 (2019).
[2]. Junfeng Zhu, et al. Construction of an H-alpha diagnostic system and its application to determine neutral hydrogen densities on the Keda Torus eXperiment, Chinese Phys. B 28 105201 (2019).
[3]. Junfeng Zhu, et al. Bolometer measurements of the radiated power and estimates of the effective ion charge Zeff on the Keda Torus eXperiment, Fusion Eng. Des. 152 111416 (2020).
[4]. Tijian Deng, et al. Fast radial scanning probe system on KTX, Plasma Sci. Technol. 22 045602 (2020).
[5]. Tijian Deng, et al. A parametric method for correcting polluted plasma current signal and its application on Keda Torus eXperiment, Rev. Sci. Instrum. 90 123513 (2019).
[6]. Mingshen Tan, et al. MHD Mode Analysis Using the Unevenly Spaced Mirnov Coils in the Keda Torus eXperiment, IEEE Trans. Plasma Sci. 47 3298 (2019).
[7]. Wenzhe Mao, et al. Forward Scattering Measurement Based on Terahertz Microwave Interferometer on KTX Reversed Field Pinch, IEEE Trans. Plasma Sci. 47 2660 (2019).
[8]. Weiqiang Tan, et al. An automatic beam alignment system based on relative reference points for Thomson scattering diagnosis system. Rev. Sci. Instrum. 90 126102 (2019).

Country or International Organization China
Affiliation KTX Laboratory and Department of Engineering and Applied Physics, University of Science and Technology of China, Hefei 230026, China

Primary authors

Prof. Tao Lan (University of Science and Technology of China) Wenzhe Mao (University of Science and Technology of China)

Co-authors

Jinlin Xie (University of Science and Technology of China) Prof. Hong Li (University of Science and Technology of China) Ahdi Liu (University of Science and Technology of China) Shude Wan (University of Science and Technology of China) Hai Wang (University of Science and Technology of China) Zian Wei (University of Science and Technology of China) Xiaohui Wen (University of Science and Technology of China) Haiyang Zhou (University of Science and Technology of China) Zhengwei Wu (University of Science and Technology of China) Zixi Liu (University of Science and Technology of China) Jian Zheng (University of Science and Technology of China) Peng Yuan (University of Science and Technology of China) Kezhu Song (University of Science and Technology of China) Zichao Li (University of Science and Technology of China) Hangqi Xu (University of Science and Technology of China) Junfeng Zhu (University of Science and Technology of China) Tijian Deng (University of Science and Technology of China) Sen Zhang (University of Science and Technology of China) Yolbarsop Adil (University of Science and Technology of China) Jintong Hu (University of Science and Technology of China) Shoubiao Zhang (Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China) Peng Fu (Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China) Lei Yang (Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China) Yuntao Song (Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China) Qinghua Ren (Southwestern Institute of Physics, Chengdu 610041, China) Yingqiao Wang (Southwestern Institute of Physics, Chengdu 610041, China) Min Xu (Southwestern Institute of Physics, Chengdu 610041, China) Xuru Duan (Southwestern Institute of Physics, Chengdu 610041, China) Chijin Xiao (Plasma Physics Laboratory, University of Saskatchewan, Canada) Weixing Ding (University of Science and Technology of China) Ge Zhuang (University of Science and Technology of China) Wandong Liu (University of Science and Technology of China)

Presentation Materials