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Chen WJ, Yu DL, Yan LW, Yuan BS, He XX, Liu L, Wei YL, Zhang N, He XF, Wu H, Shi ZB, Liu Y, Yang QW. Current Profile Reconstruction Using Motional Stark Effect Polarimeter Data on HL-2A Tokamak. FUSION SCIENCE AND TECHNOLOGY 2020. [DOI: 10.1080/15361055.2019.1629251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- W. J. Chen
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - D. L. Yu
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - L. W. Yan
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - B. S. Yuan
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - X. X. He
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - L. Liu
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - Y. L. Wei
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - N. Zhang
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - X. F. He
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - H. Wu
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - Z. B. Shi
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - Y. Liu
- 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
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Chen WJ, Yu DL, Yan LW, Yuan BS, He XX, Liu L, Wei YL, Wang J, Shi ZB, Liu Y, Yang QW. Note: Real-time wavelength matching system designed for the motional Stark effect polarimeter on HL-2A tokamak. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:126103. [PMID: 30599558 DOI: 10.1063/1.5049613] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 11/12/2018] [Indexed: 06/09/2023]
Abstract
A 7-channel motional Stark effect diagnostic based on dual photo-elastic modulators is installed and operated routinely for rather low beam energy and magnetic field on the HL-2A tokamak, with a spatial resolution of ∼3 cm and a temporal resolution of 10 ms. The instrument observes the σ component of the full energy Dα from the first or the fourth ion source of a neutral beam injector. However, the change in beam energy during a discharge causes variation of the Doppler shift with the maximum of 1 Å, which leads to the polarization fraction drop from 30%-40% to 10% and then makes the signal-to-noise ratio of the system become very poor. Therefore, a real-time wavelength matching system is designed to promote polarization fraction. The beam emission spectra are filtered by using a monochrometer in real time. And a narrowband filter is tilted by using an absolutely calibrated rotator through beam energy in order to make sure that the deviation of wavelength matching is less than 0.1 Å.
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Affiliation(s)
- W J Chen
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - D L Yu
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - L W Yan
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - B S Yuan
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - X X He
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - L Liu
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - Y L Wei
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - J Wang
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - Z B Shi
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
| | - Y Liu
- 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
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Yuan B, Ji X, Li Y, Xu Y, Zhou Y, Yu L, Liang S, Sun T. Study of plasma equilibrium reconstruction on HL-2A. FUSION ENGINEERING AND DESIGN 2018. [DOI: 10.1016/j.fusengdes.2018.06.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Li D, Dong YB, Deng W, Shi ZB, Fu BZ, Gao JM, Wang TB, Zhou Y, Liu Y, Yang QW, Duan XR. Bayesian tomography and integrated data analysis in fusion diagnostics. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:11E319. [PMID: 27910627 DOI: 10.1063/1.4960542] [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
In this article, a Bayesian tomography method using non-stationary Gaussian process for a prior has been introduced. The Bayesian formalism allows quantities which bear uncertainty to be expressed in the probabilistic form so that the uncertainty of a final solution can be fully resolved from the confidence interval of a posterior probability. Moreover, a consistency check of that solution can be performed by checking whether the misfits between predicted and measured data are reasonably within an assumed data error. In particular, the accuracy of reconstructions is significantly improved by using the non-stationary Gaussian process that can adapt to the varying smoothness of emission distribution. The implementation of this method to a soft X-ray diagnostics on HL-2A has been used to explore relevant physics in equilibrium and MHD instability modes. This project is carried out within a large size inference framework, aiming at an integrated analysis of heterogeneous diagnostics.
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Affiliation(s)
- Dong Li
- Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China
| | - Y B Dong
- Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China
| | - Wei Deng
- Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China
| | - Z B Shi
- Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China
| | - B Z Fu
- Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China
| | - J M Gao
- Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China
| | - T B Wang
- Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China
| | - Yan Zhou
- Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China
| | - Yi Liu
- Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China
| | - Q W Yang
- Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China
| | - X R Duan
- Southwestern Institute of Physics, Chengdu, Sichuan 610041, People's Republic of China
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Yu DL, Wei YL, Liu L, Cao JY, Ma Q, Chen WJ, Liu Y, Yan LW, Yang QW, Duan XR. Progress of neutral-beam-aided diagnostics on the HL-2A tokamak. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11E402. [PMID: 25430309 DOI: 10.1063/1.4886419] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A 32/64-channel Charge eXchange Recombination Spectroscopy (CXRS) and a 7-channel motional Stark effect (MSE) polarimeter have been developed on the HL-2A tokamak. To extract the maximum time resolution of the system, the incidence fibers of the spectrometer are pitch-controlled; and the double-slit fiber bundle can increase the spatial channels with one charge-coupled device detector. The ion temperature and plasma rotation with time and spatial resolutions up to 5 ms and 1 cm are obtained. Sawtooth oscillation, transition from intermediate phase (I phase) to high confinement mode (H mode) can be clearly observed by the CXRS. The spectrometer can be utilized as the main component of the MSE polarimeter, which can effectively overcome the weak Stark effect. The pitch angles of magnetic field are obtained for 7 spatial points covering 24 cm along major radius with time resolution of 40 ms.
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Affiliation(s)
- D L Yu
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Y L Wei
- Southwestern Institute of Physics, Chengdu 610041, China
| | - L Liu
- Southwestern Institute of Physics, Chengdu 610041, China
| | - J Y Cao
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Q Ma
- Southwestern Institute of Physics, Chengdu 610041, China
| | - W J Chen
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Y Liu
- Southwestern Institute of Physics, Chengdu 610041, China
| | - L W Yan
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Q W Yang
- Southwestern Institute of Physics, Chengdu 610041, China
| | - X R Duan
- Southwestern Institute of Physics, Chengdu 610041, China
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