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Hou YM, Zhou HY, Chen W, Hao BL, Liu Y, Shi ZB, Zhang YP, Duan XR. Design and first measurements of the fast-ion D-alpha diagnostic at the HL-2A tokamak. Rev Sci Instrum 2023; 94:033508. [PMID: 37012805 DOI: 10.1063/5.0099281] [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] [Received: 05/16/2022] [Accepted: 02/23/2023] [Indexed: 06/19/2023]
Abstract
The fast-ion D-alpha diagnostic (FIDA) is employed to detect Dα light emitted by neutralized fast ions during neutral beam injection. A tangentially viewing FIDA has been developed for the HuanLiuqi-2A (HL-2A) tokamak and typically achieves temporal and transverse spatial resolutions of ∼30 ms and ∼5 cm, respectively. A fast-ion tail on the red shifted wing of the FIDA spectrum is obtained and analyzed with the Monte Carlo code FIDASIM. Good agreement has been presented between the measured and simulated spectra. As the FIDA diagnostic's lines of sight intersect the central axis of neutral beam injection with small angles, the beam emission spectrum is observed with a large Doppler shift. Thus, tangentially viewing FIDA could detect only a small portion of fast ions with an energy of ≈ 20 ∼ 31 keV and a pitch angle of ≈ -1 ∼ -0.8. A second FIDA installation with oblique viewing is designed to minimize spectral contaminants.
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Affiliation(s)
- Y M Hou
- Southwestern Institute of Physics, Chengdu 610041, China
| | - H Y Zhou
- Southwestern Institute of Physics, Chengdu 610041, China
| | - W Chen
- Southwestern Institute of Physics, Chengdu 610041, China
| | - B L Hao
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Y Liu
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Z B Shi
- Southwestern Institute of Physics, Chengdu 610041, China
| | - Y P Zhang
- Southwestern Institute of Physics, Chengdu 610041, China
| | - X R Duan
- Southwestern Institute of Physics, Chengdu 610041, China
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Yang DK, Liao LY, Li YH, Zhong GQ, Zhang XJ, Zhang W, Hao BL, Hu LQ, Wan BN, Hu ZM, Zhang YM, Gorini G, Nocente M, Tardocchi M, Li XQ, Xiao CJ, Fan TS. Simulations of neutral beam injection and ion cyclotron resonance heating synergy in high power EAST scenarios. Rev Sci Instrum 2022; 93:113501. [PMID: 36461431 DOI: 10.1063/5.0101645] [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] [Received: 06/02/2022] [Accepted: 09/28/2022] [Indexed: 06/17/2023]
Abstract
The EAST plasmas heated with deuterium neutral beam injection and ion cyclotron resonance heating (ICRH) have been simulated by the TRANSP code. The analysis has been conducted using the full wave solver TORIC5, the radio frequency (RF)-kick operator, and NUBEAM to model the RF heating effects on fast ion velocity distribution. In this work, we present several simulated results compared with experiments for high power EAST scenarios, indicating that the interactions between ICRH and fast ions can significantly accelerate fast ions, which are confirmed by the increased neutron yield and broadened neutron emission spectrum measurements.
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Affiliation(s)
- D K Yang
- State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - L Y Liao
- State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Y H Li
- State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - G Q Zhong
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, Anhui, China
| | - X J Zhang
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, Anhui, China
| | - W Zhang
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, Anhui, China
| | - B L Hao
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, Anhui, China
| | - L Q Hu
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, Anhui, China
| | - B N Wan
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, Anhui, China
| | - Z M Hu
- Interdisciplinary InnoCentre for Nuclear Technology, Nanjing University, Nanjing 211106, Jiangsu, China
| | - Y M Zhang
- China Academy of Engineering Physics, Mianyang 621900, Sichuan, China
| | - G Gorini
- Dipartimento di Fisica "G. Occhialini," Università degli Studi di Milano-Bicocca, Milano 20126, Italy
| | - M Nocente
- Dipartimento di Fisica "G. Occhialini," Università degli Studi di Milano-Bicocca, Milano 20126, Italy
| | - M Tardocchi
- Institute for Plasma Science and Technology, National Research Council, Milan 20125, Italy
| | - X Q Li
- State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - C J Xiao
- State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - T S Fan
- State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
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Li XL, Wang RL, Li Y, Su J, Kang K, Guo DC, Hao BL, Huang XY, Xu BL. [Monitoring of the first imported Zika case in Henan Province]. Zhonghua Yu Fang Yi Xue Za Zhi 2018; 52:1193-1194. [PMID: 30419709 DOI: 10.3760/cma.j.issn.0253-9624.2018.11.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Affiliation(s)
- X L Li
- Institute of Infectious Disease Prevention and Control, Henan Center for Disease Control and Prevention, Zhengzhou 450016, China
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Shih CT, Su ZY, Gwan JF, Hao BL, Hsieh CH, Lo JL, Lee HC. Geometric and statistical properties of the mean-field hydrophobic-polar model, the large-small model, and real protein sequences. Phys Rev E Stat Nonlin Soft Matter Phys 2002; 65:041923. [PMID: 12005889 DOI: 10.1103/physreve.65.041923] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2001] [Revised: 12/17/2001] [Indexed: 05/23/2023]
Abstract
Lattice models, for their coarse-grained nature, are best suited for the study of the "designability problem," the phenomenon in which most of the about 16 000 proteins of known structure have their native conformations concentrated in a relatively small number of about 500 topological classes of conformations. Here it is shown that on a lattice the most highly designable simulated protein structures are those that have the largest number of surface-core switchbacks. A combination of physical, mathematical, and biological reasons that causes the phenomenon is given. By comparing the most foldable model peptides with protein sequences in the Protein Data Bank, it is shown that whereas different models may yield similar designabilities, predicted foldable peptides will simulate natural proteins only when the model incorporates the correct physics and biology, in this case if the main folding force arises from the differing hydrophobicity of the residues, but does not originate, say, from the steric hindrance effect caused by the differing sizes of the residues.
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Affiliation(s)
- C T Shih
- National Center for High-Performance Computing, Hsinchu, Taiwan, Republic of China
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Shih CT, Su ZY, Gwan JF, Hao BL, Hsieh CH, Lee HC. Mean-field HP model, designability and alpha-helices in protein structures. Phys Rev Lett 2000; 84:386-389. [PMID: 11015917 DOI: 10.1103/physrevlett.84.386] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/1998] [Indexed: 05/23/2023]
Abstract
Analysis of the geometric properties of a mean-field HP model on a square lattice for protein structure shows that structures with a large number of switchbacks between surface and core sites are chosen favorably by peptides as unique ground states. Global comparison of model (binary) peptide sequences with concatenated (binary) protein sequences listed in the Protein Data Bank and the Dali Domain Dictionary indicates that the highest correlation occurs between model peptides choosing the favored structures and those portions of protein sequences containing alpha helices.
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Affiliation(s)
- C T Shih
- National Center for High-Performance Computing, Hsinchu, Taiwan, Republic of China
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