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Lee SG, Kim MK, Kim YS. Progress of x-ray imaging crystal spectrometer utilizing double crystal assembly on KSTAR. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:023501. [PMID: 33648144 DOI: 10.1063/5.0041202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Accepted: 01/28/2021] [Indexed: 06/12/2023]
Abstract
The x-ray imaging crystal spectrometer (XICS) for Korea Superconducting Tokamak Advanced Research (KSTAR) has been upgraded to increase its performance including measurement capabilities and stable operation. A dual crystal assembly for simultaneous measurements of the helium-like and hydrogen-like Ar spectra is successfully installed for improving measurement capabilities. Using a safety viewing port with an illuminator and removing the XICS control system from the harsh KSTAR tokamak hall for a stable operation are newly performed. The experimental results from the improved XICS are investigated.
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Affiliation(s)
- S G Lee
- Korea Institute of Fusion Energy, 169-148 Gwahangno, Yueseong-gu, Daejeon 34133, South Korea
| | - M K Kim
- Korea Institute of Fusion Energy, 169-148 Gwahangno, Yueseong-gu, Daejeon 34133, South Korea
| | - Y S Kim
- Korea Institute of Fusion Energy, 169-148 Gwahangno, Yueseong-gu, Daejeon 34133, South Korea
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Lee SG, Yoo JW, Kim YS. Calibration methods of X-ray imaging crystal spectrometer on KSTAR. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:10F108. [PMID: 30399801 DOI: 10.1063/1.5034023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Accepted: 06/06/2018] [Indexed: 06/08/2023]
Abstract
The detailed calibration methods and procedure for the X-ray imaging crystal spectrometer (XICS) in the Korea Superconducting Tokamak Advanced Research device are investigated. A cross comparison from two different diagnostics including the XICS and charge exchange spectrometer is the best option, in particular, when both systems can be operated simultaneously.
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Affiliation(s)
- S G Lee
- National Fusion Research Institute, Daejeon, South Korea
| | - J W Yoo
- National Fusion Research Institute, Daejeon, South Korea
| | - Y S Kim
- National Fusion Research Institute, Daejeon, South Korea
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Yan W, Chen ZY, Jin W, Lee SG, Shi YJ, Huang DW, Tong RH, Wang SY, Wei YN, Ma TK, Zhuang G. Measurement of the electron and ion temperatures by the x-ray imaging crystal spectrometer on joint Texas experimental tokamak. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:11E318. [PMID: 27910481 DOI: 10.1063/1.4960060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
An x-ray imaging crystal spectrometer has been developed on joint Texas experimental tokamak for the measurement of electron and ion temperatures from the Kα spectra of helium-like argon and its satellite lines. A two-dimensional multi-wire proportional counter has been applied to detect the spectra. The electron and ion temperatures have been obtained from the Voigt fitting with the spectra of helium-like argon ions. The profiles of electron and ion temperatures show the dependence on electron density in ohmic plasmas.
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Affiliation(s)
- W Yan
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Z Y Chen
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - W Jin
- Center of Interface Dynamics for Sustainability, China Academy of Engineering Physics, Chengdu, Sichuan 610200, People's Republic of China
| | - S G Lee
- National Fusion Research Institute, Daejeon 305-333, South Korea
| | - Y J Shi
- Department of Nuclear Engineering, Seoul National University, Seoul 08826, South Korea
| | - D W Huang
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - R H Tong
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - S Y Wang
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Y N Wei
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - T K Ma
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - G Zhuang
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
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Yan W, Chen Z, Jin W, Huang D, Lee S, Shi Y, Tong R, Wang S, Wei Y, Ma T, Zhuang G. Phenomena of non-thermal electrons from the X-ray imaging crystal spectrometer on J-TEXT tokamak. FUSION ENGINEERING AND DESIGN 2016. [DOI: 10.1016/j.fusengdes.2016.01.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Lee SG, Yoo JW, Kim YS, Nam UW, Moon MK. Experimental results from an X-ray imaging crystal spectrometer utilizing multi-wire proportional counter for KSTAR. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:11E314. [PMID: 27910480 DOI: 10.1063/1.4960491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The inconsistency of the first experimental results from the X-ray imaging crystal spectrometer for the Korea Superconducting Tokamak Advanced Research device utilizing a multi-wire proportional counter (MWPC) is clarified after improving the photon-count rate of the data acquisition system for the MWPC and ground loop isolator for the whole spectrometer system. The improved MWPC is successfully applied to pure Ohmic plasmas as well as plasmas with high confinement modes.
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Affiliation(s)
- S G Lee
- National Fusion Research Institute, Daejeon, South Korea
| | - J W Yoo
- Korea University of Science and Technology, Daejeon, South Korea
| | - Y S Kim
- National Fusion Research Institute, Daejeon, South Korea
| | - U W Nam
- Korea Astronomy and Space Science Institute, Daejeon, South Korea
| | - M K Moon
- Korea Atomic Energy Research Institute, Daejeon, South Korea
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Yan W, Chen ZY, Jin W, Huang DW, Ding YH, Li JC, Zhang XQ, Lee SG, Shi YJ, Zhuang G. Wavelength calibration of x-ray imaging crystal spectrometer on Joint Texas Experimental Tokamak. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11E416. [PMID: 25430323 DOI: 10.1063/1.4891058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The wavelength calibration of x-ray imaging crystal spectrometer is a key issue for the measurements of plasma rotation. For the lack of available standard radiation source near 3.95 Å and there is no other diagnostics to measure the core rotation for inter-calibration, an indirect method by using tokamak plasma itself has been applied on joint Texas experimental tokamak. It is found that the core toroidal rotation velocity is not zero during locked mode phase. This is consistent with the observation of small oscillations on soft x-ray signals and electron cyclotron emission during locked-mode phase.
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Affiliation(s)
- W Yan
- School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Z Y Chen
- School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - W Jin
- School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - D W Huang
- School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Y H Ding
- School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - J C Li
- School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - X Q Zhang
- School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - S G Lee
- National Fusion Research Institute, Daejeon 305-333, South Korea
| | - Y J Shi
- National Fusion Research Institute, Daejeon 305-333, South Korea
| | - G Zhuang
- School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
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Jin W, Chen ZY, Cen YS, Lee SG, Shi YJ, Ding YH, Yang ZJ, Wang ZJ, Zhuang G. Tangential x-ray imaging crystal spectrometer on J-TEXT tokamak. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:10E502. [PMID: 23127009 DOI: 10.1063/1.4729504] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A tangential x-ray imaging crystal spectrometer (XICS) has been developed for the J-TEXT tokamak to measure the ion temperature and the plasma toroidal rotation velocity. The resonance spectral line and its satellites of Ar XVII in the ranges of 3.94 Å-4.0 Å are detected. A spherically bent quartz crystal with 2d = 4.913 Å is used in this system. The crystal has a dimension of 9 cm high and 3 cm wide and the radius of curvature 3823 mm. The XICS is designed to receive emission of Ar XVII from -10 cm to +10 cm region with a spatial resolution of 3.1 cm in the vertical direction considering the parameters of the J-TEXT plasma. The XICS has a tangential angle of 27° with respect to toroidal direction in the magnetic axis. A two-dimensional 100 mm by 300 mm multi-wire proportional counter is applied to detect the spectra.
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Affiliation(s)
- W Jin
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology, College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
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Lee SG, Bak JG, Nam UW, Moon MK, Shi Y, Bitter M, Hill K. The first experimental results from x-ray imaging crystal spectrometer for KSTAR. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:10E506. [PMID: 21034034 DOI: 10.1063/1.3478631] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The x-ray imaging crystal spectrometer (XICS) for the Korea Superconducting Tokamak Advanced Research has been first applied for the experimental campaign in 2009. The XICS was designed to provide measurements of the profiles of the ion and electron temperatures from the heliumlike argon (Ar XVII) spectra. The basic functions of the XICS are properly working although some satellites lines are not well matched with the expected theoretical values. The initial experimental results from the XICS are briefly described.
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Affiliation(s)
- S G Lee
- National Fusion Research Institute, Daejeon 305-333, South Korea.
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Lee SG, Bak JG, Nam UW, Moon MK, Cheon JK, Bitter M, Hill K. Spectral resolution measurement of an x-ray imaging crystal spectrometer for KSTAR. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2008; 79:10E317. [PMID: 19044479 DOI: 10.1063/1.2982416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A spectral resolution measurement of the x-ray imaging crystal spectrometer for the Korea Superconducting Tokamak Advanced Research machine utilizing a segmented position-sensitive detector and time-to-digital converter based delay-line readout electronics was performed by using an x-ray tube in a laboratory. The measured spectral resolution is about 12,600, which means the actual energy resolution is 0.32 eV for the x-ray tube's bremsstrahlung peak energy of 4 keV. The results from the spectral resolution measurement are described.
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Affiliation(s)
- S G Lee
- National Fusion Research Institute, Daejeon 305-333, Republic of Korea.
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Nam UW, Lee SG, Bak JG, Moon MK, Cheon JK, Lee CH. Data acquisition system for an advanced x-ray imaging crystal spectrometer using a segmented position-sensitive detector. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2007; 78:103504. [PMID: 17979416 DOI: 10.1063/1.2795650] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A versatile time-to-digital converter based data acquisition system for a segmented position-sensitive detector has been developed. This data acquisition system was successfully demonstrated to a two-segment position-sensitive detector. The data acquisition system will be developed further to support multisegmented position-sensitive detector to improve the photon count rate capability of the advanced x-ray imaging crystal spectrometer system.
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Affiliation(s)
- U W Nam
- Korea Astronomy and Space Science Institute, Taejeon 305-348, Korea.
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