作者机构：
[李小华; 赵阶成] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China;[李小华] Cooperative Innovation Center for Nuclear Fuel Cycle Technology &, Equipment, University of South China, Hengyang, 421001, China;[赵阶成; 陈晓亮; 喻宏; 陈效先] China Institute of Atomic Energy, Beijing, 102413, China
通讯机构：
School of Nuclear Science and Technology, University of South China, Hengyang, China
作者机构：
[谭凯旋; 李春光; 谭婉玉] School of Nuclear Resources Engineering, University of South China, Hengyang, 421001, China;[夏良树] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China;[刘振中] School of Environmental Protection and Safety Engineering, University of South China, Hengyang, 421001, China
通讯机构：
School of Nuclear Resources Engineering, University of South China, Hengyang, China
摘要：
Thermal characteristics during startup of CSR1000 are directly related to the security of supercritical water reactors. The heat transfer model during power-raising phase is built according to the sliding pressure mode of CSR1000 and thermal characteristics of coolant and moderator are analyzed. The results show that, during the temperature-raising phase of startup, Coolant and moderator temperatures in inner assemblies increase with core power increase only. With increases of core power and feed-water flow rate, Coolant and moderator temperatures remain unchanged during power-raising phase. Thermal properties of the coolant change in the pseudo-critical temperature and the heat transfer deterioration occurs.
作者：
Zhong, Siyao;Huang, Qianhong*;Gong, X. Y.*;Zhang, Neng;Dong, J. Q.;...
期刊：
PHYSICS OF PLASMAS,2017年24(10):102519 ISSN：1070-664X
通讯作者：
Huang, Qianhong;Gong, X. Y.
作者机构：
[Zhong, Siyao; Su, JiaHao; Huang, Qianhong; Gong, X. Y.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Zhang, Neng; Dong, J. Q.] Southwestern Inst Phys, POB 432, Chengdu 610041, Sichuan, Peoples R China.;[Dong, J. Q.] Zhejiang Univ, Inst Fus Theory & Simulat, Hangzhou 310058, Zhejiang, Peoples R China.
通讯机构：
[Huang, QH; Gong, XY] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
关键词：
eigenvalues and eigenfunctions;electron traps;plasma impurities;plasma temperature;plasma toroidal confinement;plasma transport processes;Tokamak devices
摘要：
The coupling of the short wavelength ion temperature gradient mode (SWITG) and trapped electron mode (SWTEM) in the presence of impurity ions is numerically studied in tokamak plasmas. It is found that the coupling of SWITG and SWTEM modes is divided into hybrid and coexistent cases. The impurity ions always have stabilizing effects on the hybrid mode (namely, SWTE-ITG) with small ηi (ηi < 0.5), which is different from the conventional TE-ITG mode. In the lager ηi (ηi > 0.5) regime, the impurity ions with the density profiles peaked inwardly (outwardly) stabilize (destabilize) the SWTE-ITG mode. Another new finding in this paper is that the impurity ions stabilize the SWTEM mode independent of whether their density profile is peaked inwardly or outwardly. The result for the SWITG mode is similar to the SWTE-ITG mode in the lager ηi regime, except that the excitation of the SWTEM mode requires ηi higher than a certain threshold. In addition, the kθρs spectra, eigenmode structures, and the effects of different impurity ion species on the modes are discussed.
摘要：
Electron-positron (e(-) e(+)) pair plasma generation in the relativistic transparency regime in a thin foil with a fixed thickness irradiated by two counter-propagating laser pulses is investigated through multi-dimensional particle-in-cell simulations. It is shown that target transparency can significantly enhance the pair generation due to the formation of a stable standing wave. An optimum foil density of 200-280 n(c) (with n(c) being the critical plasma density of the incident laser at the wavelength of 1 mu m) is found for enhanced e(-) e(+) pair generation for laser intensity around 10 PW. With such foil density, laser energy transformed to pair plasma formation is approximately four times higher than that with a foil density of 710 n(c), while the laser energy transformed to gamma-photons remains almost the same. Dense e(-) e(+) plasma with a density as high as 10(22) cm(-3) (similar or equal to 10 n(c)) can be produced accordingly. Comparison of pair plasma generation between cases with fundamental and double frequency driver lasers further demonstrates such an enhancement effect. It shows that when the duration of the laser pulse is relatively short, the double frequency driver can generate more pair plasmas due to the earlier excitation of relativistic transparency. Published by AIP Publishing.
作者：
Yuan, T.;Chen, M.*;Yu, J. Y.;Liu, W. Y.;Luo, W.;...
期刊：
PHYSICS OF PLASMAS,2017年24(6):063104 ISSN：1070-664X
通讯作者：
Chen, M.
作者机构：
[Chen, M.; Sheng, Z. M.; Yu, J. Y.; Weng, S. M.; Yuan, T.] Shanghai Jiao Tong Univ, Key Lab Laser Plasmas, Minist Educ, Shanghai 200240, Peoples R China.;[Chen, M.; Sheng, Z. M.; Yu, J. Y.; Weng, S. M.; Yuan, T.] Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200240, Peoples R China.;[Chen, M.; Sheng, Z. M.; Yu, J. Y.; Weng, S. M.; Yuan, T.] Shanghai Jiao Tong Univ, CICIFSA, Shanghai 200240, Peoples R China.;[Luo, W.; Liu, W. Y.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Luo, W.; Sheng, Z. M.] Univ Strathclyde, Dept Phys, SUPA, Glasgow G4 0NG, Lanark, Scotland.
摘要：
Pair production from the Breit-Wheeler process in ultra-intense laser pulse interactions with solid targets are studied by particle-in-cell simulations using the EPOCH code including the quantum electrodynamics module. We find that the pair yield depends on both the target transverse size and the laser pulse duration. For a short laser pulse, the highest pair yield is achieved with a target as wide as the laser spot size. For a long laser pulse, however, the optimal target size for the pair production increases with the pulse duration due to a self-generated cone by the hole-boring process. The effect of laser polarization upon the pair production is also studied. It is found that a circularly polarized laser pulse is more efficient in the ion acceleration rather than in the pair production. With the same laser energy, we find that a linearly polarized laser pulse can generate two times more positrons than the circularly polarized laser pulse does. These findings may benefit the future researches on the laser plasma based electron-positron production.
摘要：
In this work, a facile method was adopted to synthesize molybdenum disulfide/reduced graphene oxide (MoS_2/rGO) composites through an L-cysteine-assisted hydrothermal technique. The as-prepared MoS_2/ rGO composites were firstly applied as adsorbents for efficient elimination of Pb(II) ions. Batch adsorption experiments showed that the adsorption of Pb(II) on MoS_2/rGO followed pseudo-second-order kinetic model well. The adsorption of Pb(II) was intensely pH-dependent, ionic strength-dependent at pH < 9.0 and ionic strength-independent at pH > 9.0. The presence of humic acid (HA) enhanced Pb(II) adsorption obviously. The MoS_2/rGO composites exhibited excellent adsorption capacity of 384.16 mg g~(-1) at pH 5.0 and T=298.15 K, which was superior to MoS_2 (279.93 mg g~(-1)) and many other adsorbents. The thermodynamic parameters suggested that the adsorption process of Pb(II) on MoS_2/rGO composites was spontaneous (?G~θ < 0) and endothermic (?H~θ > 0). The interaction of Pb(II) and MoS_2/ rGO was mainly dominated by electrostatic attraction and surface complexation between Pb(II) and oxygen-containing functional groups of MoS_2/rGO. This work highlighted the application of MoS_2/rGO as novel and promising materials in the efficient elimination of Pb(II) from contaminated water and industrial effluents in environmental pollution management.
期刊：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS,2017年406(Pt.B):470-474 ISSN：0168-583X
通讯作者：
Zhang, Chao;Wang, Dong-Qi
作者机构：
[Song, Huai-Zhi; Wang, Cheng-Jun; Zhang, Chao] Anhui Univ Sci & Technol, Sch Mat Sci & Engn, Huainan 232001, Peoples R China.;[Mao, Fei] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Wang, Dong-Qi] Chinese Acad Sci, Inst High Energy Phys, Multidisciplinary Initiat Ctr, Beijing 100049, Peoples R China.;[Zhang, Feng-Shou] Beijing Normal Univ, Coll Nucl Sci & Technol, Minist Educ, Key Lab Beam Technol & Mat Modificat, Beijing 100875, Peoples R China.;[Zhang, Feng-Shou] Beijing Radiat Ctr, Beijing 100875, Peoples R China.
通讯机构：
[Zhang, Chao] A;[Wang, Dong-Qi] C;Anhui Univ Sci & Technol, Sch Mat Sci & Engn, Huainan 232001, Peoples R China.;Chinese Acad Sci, Inst High Energy Phys, Multidisciplinary Initiat Ctr, Beijing 100049, Peoples R China.
会议名称：
27th International Conference on Atomic Collisions in Solids (ICACS)
会议时间：
JUL 24-29, 2016
会议地点：
Chinese Acad Sci, Inst Modern Phys, Lanzhou, PEOPLES R CHINA
会议主办单位：
Chinese Acad Sci, Inst Modern Phys
关键词：
Irradiation damage;SiC composites;Interphase;Electronic excitation effect;Two-temperature model
摘要：
Silicon carbide fiber-reinforced silicon carbide matrix composites have been investigated for their use as structural materials for advanced nuclear reactor. Although quite a number of researches have been devoted to probe the effects of irradiation on various properties of the composites, there is little known about the atomistic mechanism for irradiation resistance. In this study, a two-temperature model has been used to investigate the irradiation damage of SiC/Gra/SiC composites, which includes three parts and two SiC/C interfaces, two single crystal cubic silicon carbide on two sides and a few graphene sheets in the middle part. By simulating 100 keV displacement cascades, we find that the number of defects in the reinforcement is larger than that in the matrix, which indicates the damage in the reinforcement is more serious than that in the matrix. Moreover, we explicitly investigate the damage behavior of the interphase graphene layers and find that some atoms in one graphene sheet form many new chemical bonds with atoms in another one, which leads to the transition from sp(2) to sp(3) hybridization. The newly formed chemical bonds link the different graphene layers and make graphene-like electronic structure more "diamond-like", enhancing the irradiation resistance of the matrix. (C) 2017 Elsevier B.V. All rights reserved.
期刊：
PROCEEDINGS OF THE 25TH INTERNATIONAL CONFERENCE ON NUCLEAR ENGINEERING, 2017, VOL 5,2017年5
通讯作者：
Cao Jian
作者机构：
[Cao Jian; Yang Sen-gai; Xiong Wen-bin; Li Hu-wei; Mao Huan; Wang Zhan-yong; Wang Chuang; Wang Jing] MEP, Nucl & Radiat Safety Ctr, Beijing 10082, Peoples R China.;[Xie Qin] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
会议论文集名称：
Proceedings of the 2017 25th International Conference on Nuclear Engineering
摘要：
The whole core model of CEFR is established according to the parameters of China Experimental Fast Reactor which are given by IAEA-TECDOC-1531, and the physical parameters of CEFR are simulated with the MCNP4a program. The calculation results are compared with the data contained in the safety analysis report of CEFR. The calculation results are consistent with the design value, which successfully demonstrates the reliability of this MCNP model. The MCNP model will be further refined and applied for nuclear safety review of the CEFR in the future.
期刊：
Nuclear Engineering and Design,2017年322:14-26 ISSN：0029-5493
通讯作者：
Zeng, W. J.
作者机构：
[Zhang, Y. W.] Xi An Jiao Tong Univ, Dept Nucl Sci & Technol, Xian 710049, Peoples R China.;[Zeng, W. J.] Univ South China, Dept Nucl Sci & Technol, Hengyang City 421001, Peoples R China.
通讯机构：
[Zeng, W. J.] U;Univ South China, Dept Nucl Sci & Technol, Hengyang City 421001, Peoples R China.
关键词：
CPR1000;Load follow operation;MSHIM core control strategy;Power control analysis method
摘要：
The CPR1000, one of the water-cooled reactor types in China, employ MODE-G core control strategy through control rods and soluble boron to control the reactivity change during load follow operation, In spite of this, it has load follow capability for only 80% of cycle life, and also a large amount of radioactive waste liquid will be produced. In order to solve this problem, the MSHIM core control strategy was designed for CPR1000 in this paper. The MSHIM core control strategy has two independently moving RCCA groups are utilized for essentially simultaneous control of reactivity/temperature control and axial power distribution with complete boron-adjustment free load follow operation for up to more than 95% of cycle life. The prime objective of core control is to simultaneously manage core power level and power distribution to ensure the reactor operation safety. In the MSHIM core control strategy in CPR1000, reactor power control includes power level control and power distribution control. Power level control uses the reactivity balance analysis method; the objective of power distribution control is to ensure the safety related parameters, such as DNBRs and F-Q within its design limit, AO control analysis method is used. According to the reactivity balance analysis method, the control rods inserted in reactor core to offset the positive reactivity during load follow operation, and in CPR1000 core, part G1-bank is lifted to supply the positive reactivity prior to load follow operation. AO analysis result shows that the axial burnup distribution can affect the AO target value, AO control ability is enhanced with the increase of R-bank worth. Changing burnup history and redesigning the RCCAs are employed. (C) 2017 Elsevier B.V. All rights reserved.
