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Tu C, Liu A, Li Z, Tan M, Luo B, You W, Li C, Bai W, Fu C, Huang F, Xiao B, Shen B, Shi T, Chen D, Mao W, Li H, Xie J, Lan T, Ding W, Xiao C, Liu W. Electromagnetic diagnostic system for the Keda Torus eXperiment. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2017; 88:093513. [PMID: 28964207 DOI: 10.1063/1.5003039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Accepted: 09/01/2017] [Indexed: 06/07/2023]
Abstract
A system for electromagnetic measurements was designed and installed on the Keda Torus eXperiment (KTX) reversed field pinch device last year. Although the unique double-C structure of the KTX, which allows the machine to be opened easily without disassembling the poloidal field windings, makes the convenient replacement and modification of the internal inductive coils possible, it can present difficulties in the design of flux coils and magnetic probes at the two vertical gaps. Moreover, the KTX has a composite shell consisting of a 6 mm stainless steel vacuum chamber and a 1.5 mm copper shell, which results in limited space for the installation of saddle sensors. Therefore, the double-C structure and composite shell should be considered, especially during the design and installation of the electromagnetic diagnostic system (EDS). The inner surface of the vacuum vessel includes two types of probes. One type is for the measurement of the global plasma parameters, and the other type is for studying the local behavior of the plasma and operating the new saddle coils. In addition, the probes on the outer surface of the composite shell are used for measurements of eddy currents. Finally, saddle sensors for radial field measurements for feedback control were installed between the conducting shell and the vacuum vessel. The entire system includes approximately 1100 magnetic probes, 14 flux coils, 4×26×2 saddle sensors, and 16 Rogowski coils. Considering the large number of probes and limited space available in the vacuum vessel, the miniaturization of the probes and optimization of the probe distribution are necessary. In addition, accurate calibration and careful mounting of the probes are also required. The frequency response of the designed magnetic probes is up to 200 kHz, and the resolution is 1 G. The EDS, being spherical and of high precision, is one of the most basic and effective diagnostic tools of the KTX and meets the demands imposed by requirements on basic machine operating information and future studies.
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Affiliation(s)
- Cui Tu
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Adi Liu
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Zichao Li
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Mingsheng Tan
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Bing Luo
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Wei You
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Chenguang Li
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Wei Bai
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Chenshuo Fu
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Fangcheng Huang
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Bingjia Xiao
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Biao Shen
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Tonghui Shi
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Dalong Chen
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Wenzhe Mao
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Hong Li
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jinglin Xie
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Tao Lan
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Weixing Ding
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Chijin Xiao
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Wandong Liu
- KTX Laboratory and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
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Bolzonella T, Igochine V, Guo SC, Yadikin D, Baruzzo M, Zohm H. Resistive-wall-mode active rotation in the RFX-mod device. PHYSICAL REVIEW LETTERS 2008; 101:165003. [PMID: 18999679 DOI: 10.1103/physrevlett.101.165003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2008] [Indexed: 05/27/2023]
Abstract
The fundamental question of how the flow velocity of the background plasma can influence the motion of magnetohydrodynamics instabilities and, in the ultimate analysis, their stability is addressed. The growth of resistive-wall-mode instabilities in toroidal confinement devices well represents one example of such a problem. In this Letter, we illustrate a new strategy that allowed, for the first time in a reversed field pinch experiment, a fully controlled rotation of a nonresonant instability by means of a set of active coils and how the new findings compare with numerical modeling.
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Affiliation(s)
- T Bolzonella
- Consorzio RFX, Associazione Euratom-ENEA sulla fusione, Padua, Italy.
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