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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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Lyu B, Chen J, Hu RJ, Delgado-Aparicio LF, Wang FD, Bitter M, Hill KW, Pablant N, Lee SG, Ye MY, Shi YJ, Wan BN. Development of wavelength calibration techniques for high-resolution x-ray imaging crystal spectrometers on the EAST tokamak. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:10F112. [PMID: 30399885 DOI: 10.1063/1.5039314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 07/26/2018] [Indexed: 06/08/2023]
Abstract
Newly developed large-area pixelated two-dimensional detector and two-crystal assemblies were deployed for the first time on tokamaks to enable time-resolved Bragg-diffracted x-ray imaging with good framing rate and water-cooling capabilities for in-vacuum long-pulse operations. High-quality helium-like (He-like) and hydrogen-like (H-like) argon spectra have been observed simultaneously for the first time on a single detector for a wide range of plasma parameters to infer both ion temperature and rotation profiles and support studies on spontaneous rotation, impurity transport, and RF physics. Since tokamak plasmas rotate in both the poloidal (θ) and toroidal (ϕ) directions, a reliable wavelength calibration is needed to account for the correct Doppler shift as well as to compute the spectrometer's instrumental function. Lyα lines emitted from Cd x-ray tubes are proposed to be used as "markers" to provide an in situ calibration of the EAST's X-ray imaging crystal spectrometer systems measuring He- and H-like argon spectra. The first lab test indicated that the X-ray tube can excite strong Lyα lines at 15 kV voltage and 1 mA current when the crystal is shined for 10 min. Other indirect calibration methods using locked-mode discharge scenarios were also studied as complementary methods.
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Affiliation(s)
- B Lyu
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - J Chen
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - R J Hu
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
| | | | - F D Wang
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - M Bitter
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543-0451, USA
| | - K W Hill
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543-0451, USA
| | - N Pablant
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543-0451, USA
| | - S G Lee
- National Fusion Research Institute, Daejeon 305-333, South Korea
| | - M Y Ye
- Department of Engineering and Applied Physics, University of Science and Technology of China, Hefei 230026, China
| | - Y J Shi
- Department of Nuclear Engineering, Seoul National University, Seoul 151-742, South Korea
| | - B N Wan
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, 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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