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Yuan BD, Yu Y, He RC, Yang XY, Xu TC, Yuan JB, Hong RJ, Nie L, Ke R, Long T, Wang ZH, Xiao CJ, Xu M, Li JQ, Ye MY, Duan XR. Development of a multi-color gas puff imaging diagnostic on HL-2A tokamak. Rev Sci Instrum 2020; 91:073505. [PMID: 32752858 DOI: 10.1063/5.0005545] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Accepted: 07/02/2020] [Indexed: 06/11/2023]
Abstract
A Multi-Color (MC) gas puff imaging diagnostic has been developed on HL-2A tokamak. This diagnostic can simultaneously measure two-dimensional (2D, radial, and poloidal) electron density and temperature distributions with a good spatial resolution of 2.5 × 2.5 mm2 and a temporal resolution of about 100 µs at best in edge plasmas. The 2D electron density and temperature distributions are inferred from the ratios of intensities of three different neutral helium emission lines; therefore, it is also referred to as helium beam probe or beam emission spectroscopy on thermal helium. A compact light splitter is used to split the inlet visible emission beam into four channels, and the specific neutral helium lines of the wavelengths λ1 = 587.6 nm, λ2 = 667.8 nm, λ3 = 706.5 nm, and λ4 = 728.1 nm are measured, respectively. This MC diagnostic has been experimentally tested and calibrated on a linear magnetic confinement device Peking University Plasma Test device, and the measured 2D electron density and temperature distributions are compared with the Langmuir probe measurements.
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Affiliation(s)
- B D Yuan
- School of Physics, University of Science and Technology of China, Hefei 230026, China
| | - Y Yu
- School of Physics, University of Science and Technology of China, Hefei 230026, China
| | - R C He
- School of Physics, Peking University, Beijing 100871, China
| | - X Y Yang
- School of Physics, Peking University, Beijing 100871, China
| | - T C Xu
- School of Physics, Peking University, Beijing 100871, China
| | - J B Yuan
- Southwestern Institute of Physics, Chengdu 610041, China
| | - R J Hong
- Physics and Astronomy Department, University of California, Los Angeles, California 90095, USA
| | - L Nie
- Southwestern Institute of Physics, Chengdu 610041, China
| | - R Ke
- Southwestern Institute of Physics, Chengdu 610041, China
| | - T Long
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Z H Wang
- Southwestern Institute of Physics, Chengdu 610041, China
| | - C J Xiao
- School of Physics, Peking University, Beijing 100871, China
| | - M Xu
- Southwestern Institute of Physics, Chengdu 610041, China
| | - J Q Li
- Southwestern Institute of Physics, Chengdu 610041, China
| | - M Y Ye
- School of Physics, University of Science and Technology of China, Hefei 230026, China
| | - X R Duan
- Southwestern Institute of Physics, Chengdu 610041, China
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Huang Y, Wang YQ, Hou ZP, Ren LL, Liu CH, Feng Z, Luo CW. Multipoint vertical-Thomson scattering diagnostic on HL-2A tokamak. Rev Sci Instrum 2018; 89:10C116. [PMID: 30399663 DOI: 10.1063/1.5035556] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 06/28/2018] [Indexed: 06/08/2023]
Abstract
Some progress has been made to develop the multipoint Thomson scattering (TS) diagnostic for the HL-2A tokamak physics experiments. Hardware of silicon avalanche photodiode detector electronics is improved, which provides two output signal channels. In one channel, only the rapid TS signal is the output after deducting the influence of the background slow-varying plasma light. In the other, both the rapid TS signal and the plasma background signal are the output. In the latest HL-2A experiment campaign, the newly developed electronics are tested and TS signals can be obtained from each of the two channels, where the signal is digitized by 12-bit transient recorder sampled at 1 GS/s. Laser beam alignment is fulfilled by using motorized stages to control the laser beam passing through ∼10 mm-wide narrow throats of the lower and upper closed divertors with small movements and then the stray laser light is reduced. New modules of fast digitizers with more than 100 channels are installed and will be used to record TS pulse signals. On the basis of these achievements, about 15-point measurements of plasma electron temperature and density by Thomson scattering diagnostic will come into operation in the upcoming HL-2A experiment campaign.
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Affiliation(s)
- Y Huang
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - Y Q Wang
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - Z P Hou
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - L L Ren
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - C H Liu
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - Z Feng
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - C W Luo
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
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Abstract
A multi-spectral line-polarization motional Stark effect (MSE-MSLP) diagnostic has been developed for the Alcator C-Mod tokamak wherein the Stokes vector is measured in multiple wavelength bands simultaneously on the same sightline to enable better polarized background subtraction. A ten-sightline, four wavelength MSE-MSLP detector system was designed, constructed, and qualified. This system consists of a high-throughput polychromator for each sightline designed to provide large étendue and precise spectral filtering in a cost-effective manner. Each polychromator utilizes four narrow bandpass interference filters and four custom large diameter avalanche photodiode detectors. Two filters collect light to the red and blue of the MSE emission spectrum while the remaining two filters collect the beam pi and sigma emission generated at the same viewing volume. The filter wavelengths are temperature tuned using custom ovens in an automated manner. All system functions are remote controllable and the system can be easily retrofitted to existing single-wavelength line-polarization MSE systems.
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Affiliation(s)
- R T Mumgaard
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - S D Scott
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
| | - M Khoury
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Liu CH, Huang Y, Wang YQ, Feng Z, Hou ZP, Fu BZ. The progress in development of edge tangential Thomson scattering system on HL-2A tokamak. Rev Sci Instrum 2016; 87:11E555. [PMID: 27910507 DOI: 10.1063/1.4963200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The edge tangential Thomson scattering system (ETTSS) was developed for the first time on a HL-2A tokamak. A Nd:YAG laser with a 1064 nm wavelength, 4 J energy, and 30 Hz repetition rate is employed on the ETTSS. The laser beam injects the plasma in the tangential direction on the mid-plane of the machine, and the angles between the laser injection direction and the scattered light collection direction are in the range from 157.5° to 162.8°. The scattered light collection optics with 0.21-0.47 magnification is utilized to collect the scattered light of measurement range from R = 1900 mm to 2100 mm (the normalized radius is from r/a = 0.625 to 1.125). Spatial resolution of the preliminary design could be up to Δr/a = 0.016. The measurement requirements could be achieved: 10 eV < Te < 1.5 keV, and 0.5 × 1019 m-3 < ne < 3 × 1019 m-3 with errors less than 15% and 10%, respectively.
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Affiliation(s)
- C H Liu
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - Y Huang
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - Y Q Wang
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - Z Feng
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - Z P Hou
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - B Z Fu
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
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Xiao S, Zang Q, Han X, Wang T, Yu J, Zhao J. A new dump system design for stray light reduction of Thomson scattering diagnostic system on EAST. Rev Sci Instrum 2016; 87:073506. [PMID: 27475558 DOI: 10.1063/1.4959185] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 07/08/2016] [Indexed: 06/06/2023]
Abstract
Thomson scattering (TS) diagnostic is an important diagnostic for measuring electron temperature and density during plasma discharge. However, the measurement of Thomson scattering signal is disturbed by the stray light easily. The stray light sources in the Experimental Advanced Superconducting Tokamak (EAST) TS diagnostic system were analyzed by a simulation model of the diagnostic system, and simulation results show that the dump system is the primary stray light source. Based on the optics theory and the simulation analysis, a novel dump system including an improved beam trap was proposed and installed. The measurement results indicate that the new dump system can reduce more than 60% of the stray light for the diagnostic system, and the influence of stray light on the error of measured density decreases.
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Affiliation(s)
- Shumei Xiao
- Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, Anhui 230031, People's Republic of China
| | - Qing Zang
- Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, Anhui 230031, People's Republic of China
| | - Xiaofeng Han
- Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, Anhui 230031, People's Republic of China
| | - Tengfei Wang
- Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, Anhui 230031, People's Republic of China
| | - Jin Yu
- Academy of Opto-Electronics, Chinese Academy of Sciences, Beijing 100094, People's Republic of China
| | - Junyu Zhao
- Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, Anhui 230031, People's Republic of China
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Xiao S, Hu A, Chen H, Han X, Wang T, Zang Q, Zhao J. Analysis of baffles for stray light reduction in the Thomson scattering diagnostic on EAST. Fusion Engineering and Design 2016. [DOI: 10.1016/j.fusengdes.2016.02.071] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Shi ZB, Jiang M, Huang XL, Zhong WL, Chen W, Che YL, Liu ZT, Ding XT, Yang QW, Duan XR. Calibration of a 32 channel electron cyclotron emission radiometer on the HL-2A tokamak. Rev Sci Instrum 2014; 85:023510. [PMID: 24593364 DOI: 10.1063/1.4866640] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A novel 32-channel electron cyclotron emission radiometer has been designed and tested for the measurement of electron temperature profiles on the HL-2A tokamak. This system is based on the intermediate frequency filter detection technique, and has the features of wide working frequency range and high spatial resolution. Two relative calibration methods have been investigated: sweeping the toroidal magnetic field and hopping the output frequency of the local oscillator. Preliminary results show that both methods can ensure reasonable profiles.
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Affiliation(s)
- Z B Shi
- Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China
| | - M Jiang
- Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China
| | - X L Huang
- Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China
| | - W L Zhong
- Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China
| | - W Chen
- Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China
| | - Y L Che
- Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China
| | - Z T Liu
- Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China
| | - X T Ding
- Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China
| | - Q W Yang
- Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China
| | - X R Duan
- Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China
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Thomas J, Kumar A, Chaudhari V, Pandya K, Singh R. Design and development of five-channel interference filter polychromator for SST-1 Thomson scattering system. Fusion Engineering and Design 2012. [DOI: 10.1016/j.fusengdes.2011.11.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Cui Z, Morita S, Fu B, Huang Y, Sun P, Gao Y, Xu Y, Dong C, Lu P, Wang Q, Ding X, Yang Q, Duan X. Space-resolved vacuum ultraviolet spectrometer system for edge impurity and temperature profile measurement in HL-2A. Rev Sci Instrum 2010; 81:043503. [PMID: 20441337 DOI: 10.1063/1.3378288] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A 1 m normal incidence vacuum ultraviolet (VUV) spectrometer has been developed for spatial distribution measurement of edge impurity line emission in the wavelength range of 300-3200 A on HL-2A tokamak. A vertical profile of the impurity line emission is measured with a space-resolved slit placed between an entrance slit and a grating of the spectrometer. Two concave 1200 grooves/mm gratings blazed at 800 and 1500 A are set on a rotatable holder in the spectrometer, which gives wavelength dispersion of 0.12 mm/A. A back-illuminated charge-coupled device is used as a detector with an image size of 6.7 x 26.6 mm(2) (26 x 26 microm(2)/pixel). An excellent spatial resolution of 2 mm is obtained with good spectral resolution of 0.15 A when the space-resolved slit of 50 microm in width is used. The space-resolved spectra thus provide three radial profiles of emission line intensity, ion temperature, and poloidal rotation. The electron temperature can be measured by the intensity ratio, e.g., CIII 2s(2)-2s3p (386 A)/2s(2)-2s2p (977 A). The sensitivity of the spectrometer is calibrated in situ by using the VUV bremsstrahlung continuum radiation emitted from the tokamak plasma. A good performance of the spectrometer system for the edge impurity and temperature profile measurements is presented with results on Ohmic and H-mode discharges.
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Affiliation(s)
- Zhengying Cui
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
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