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Overrun phenomenon and neutron yield in Coulomb explosion of deuterated alkane clusters driven by intense laser field

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Chinese Physics B 2018年第6期27卷 274-279页

作者： Hong-Yu Li Mei-Dong Huang Ming Kang De-Jun Li College of Physics and Materials Science Tianjin Normal University Tianjin 300387 China

By using a simplified Coulomb explosion model, the laser-driven Coulomb explosion processes of three deuterated alkane clusters, i.e., deuterated methane（CD4）N, ethane（C2D6）N and propane（C3D8）N clusters are simulated *** overrun phenomenon that the deuterons overtake the carbon ions inside the expanding clusters, as well as the dependence of the energetic deuterons and fusion neutron yield on cluster size, is discussed in detail. Researches show that the average kinetic energy of deuterons and neutron yield generated in the Coulomb explosion of（C2D6）N cluster are higher than those of（CD4）N cluster with the same size, in qualitative agreement with the reported conclusions from the experiments of（C2 H6）N and（CH4）N clusters. It is indicated that（C2D6）N clusters are superior to（CD4）N clusters as a target for the laser-induced nuclear fusion reaction to achieve a higher neutron yield. In addition, by comparing the relevant data of（C3D8）N cluster with those of（C2D6）N cluster with the same size, it is theoretically concluded that（C3D8）N clusters with a larger competitive parameter might be a potential candidate for improving neutron generation. This will provide a theoretical basis for target selection in developing experimental schemes on laser-driven nuclear fusion in the future.

关键词： deuterated alkane cluster Coulomb explosion deuteron kinetic energy neutron yield

Measurement of muon-induced neutron yield at the China Jinping Underground Laboratory

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Chinese Physics C 2022年第8期46卷 211-219页

作者： Lin Zhao Wentai Luo Lars Bathe-Peters Shaomin Chen Mourad Chouaki Wei Dou Lei Guo Ziyi Guo Ghulam Hussain Jinjing Li Ye Liang Qian Liu Guang Luo Ming Qi Wenhui Shao Jian Tang Linyan Wan Zhe Wang Yiyang Wu Benda Xu Tong Xu Weiran Xu Yuzi Yang Minfang Yeh Aiqiang Zhang Bin Zhang JNE collaboration Department of Engineering Physics Tsinghua UniversityBeijing 100084China Center for High Energy Physics Tsinghua UniversityBeijing 100084China Key Laboratory of Particle&Radiation Imaging(Tsinghua University) Ministry of EducationChina Institut für Physik Technische Universität BerlinBerlin 10623Germany École Polytechnique Fédérale de Lausanne Lausanne 1015Switzerland School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China School of Physics Nanjing UniversityNanjing 210093China Brookhaven National Laboratory UptonNew York 11973USA 不详

Solar,terrestrial,and supernova neutrino experiments are subject to muon-induced radioactive *** China Jinping Underground Laboratory(CJPL),with its unique advantage of a 2400 m rock coverage and long distance from nuclear power plants,is ideal for MeV-scale neutrino *** a 1-ton prototype detector of the Jinping Neutrino Experiment(JNE),we detected 3 43 high-energy cosmic-ray muons and(7.86±3.97)muon-induced neutrons from an 820.28-day dataset at the first phase of CJPL(CJPL-I).Based on the muon-induced neutrons,we measured the corresponding muon-induced neutron yield in a liquid scintillator to be(3.44±1.86_(stat.)±0.76_(syst.))×10^(-4) μ^(-1)g^(-1)cm^(2) at an average muon energy of 340 *** provided the first study for such neutron background at CJPL.A global fit including this measurement shows a power-law coefficient of(0.75±0.02) for the dependence of the neutron yield at the liquid scintillator on muon energy.

关键词： Underground laboratory neutrino detector cosmic-ray muon neutron yield liquid scintillator

neutron yields Based on Transport Calculation in EAST ICRF Minority Heating Plasmas

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Plasma Science and Technology 2013年第5期15卷 411-416页

作者：李晓玲万宝年郭智荣钟国强胡立群林士耀张新军丁斯晔吕波 Institute of Plasma Physics Chinese Academy of Sciences Wuhan Second Ship Design and Research Institute

neutron diagnostics, including flux and energy spectrum measurements, have been applied on the experimental advanced superconducting tokamak （EAST）. The absolute calibration of neutron yields has been achieved by a calculation method using the Monte Carlo automatic modeling （MCAM） system and the Monte Carlo N-Particles （MCNP） code. Since the neutron yield is closely related with the ion density and temperature, it is a good measure of plasma performance, especially the wave heating effect. In ion cyclotron range of frequencies （ICRF） experiments, the increase in the ion temperature derived by the neutron yield indicates an effective plasma heating. Minority protons damp a large fraction of the total wave power, and then transfer part of the energy to deuterium by collisions. neutron spectrum measurements also indicate that no tail is created by high energy deuterons during ICRF heating. However, the ion temperature derived by the neutron yield is consistent with the result by using a poloidal X-ray imaging crystal spectrometer （PXCS）, showing a reliable transport calculation.

关键词： neutron yield MCNP ICRF minority heating

neutron yields and emission rates in the forward direction for 50 MeV/u 18O-ion on thick Be,Cu,Au targets

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Nuclear Science and Techniques 1997年第4期 47-50页

作者： Li Gui Sheng, Zhang Tian Mei, Li Zong Wei, Su You Wu and Zhang Shu Min ( Institute of Modern Physics, the Chinese Academy of Sciences, Lanzhou 730000)

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关键词： Threshold detector neutron activation Heavy ion reactions neutron yield neutron emission rate

A simple analytical model of laser direct-drive thin shell target implosion

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Chinese Physics B 2022年第4期31卷 481-485页

作者： Bo Yu Tianxuan Huang Li Yao Chuankui Sun Wanli Shang Peng Wang Xiaoshi Peng Qi Tang Zifeng Song Wei Jiang Zhongjing Chen Yudong Pu Ji Yan Yunsong Dong Jiamin Yang Yongkun Ding Jian Zheng School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China Research Center of Laser Fusion China Academy of Engineering PhysicsMianyang 621900China Institute of Applied Physics and Computational Mathematics Beijing 100088China IFSA Collaborative Innovation Center Shanghai Jiao Tong UniversityShanghai 200240China

A high-neutron yield platform imploded by a thin shell target is generally built to probe nuclear science problems,and it has the advantages of high neutron yield,ultrashort fusion time,micro fusion zone,isotropic and monoenergetic *** analytical models have been proposed to interpret exploding-pusher target implosion driven by a long wavelength laser,whereas they are imperfect for a 0.35 μm laser implosion *** using the 0.35 μm laser,the shell is ablated and accelerated to high implosion velocity governed by Newton’s law,ablation acceleration and quasi-adiabatic compression models are suitable to explain the implosion of a laser direct-drive thin shell *** new analytical model scales bang time,ion temperature and neutron yield for large variations in laser power,target radius,shell thickness,and fuel *** predicted results of the analytical model are in agreement with experimental data on the ShenguangIII prototype laser facility,100 kJ laser facility,Omega,and NIF,it demonstrates that the analytical model benefits the understanding of experiment performance and optimizing the target design of high neutron yield implosion.

关键词： direct drive analytical model thin shell target neutron yield

Lifetime and shelf life of sealed tritium-filled plasma focus chambers with gas generator

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Matter and Radiation at Extremes 2017年第6期2卷 303-308页

作者： B.D.Lemeshko А.К.Dulatov Yu V.Mikhailov I.A.Prokuratov A.N.Selifanov T.S.Fatiev V.G.Andreev Federal State Unitary Enterprise All-Russian Research Institute of Automatics(FSUE VNIIA) 22 Suschevskaya stMoscowRussia

The paper describes the operation features of plasma focus chambers using deuteriumetritium *** tritium requires the use of sealed,vacuum-tight plasma focus *** these chambers,there is an accumulation of the impurity gases released from the inside surfaces of the electrodes and the insulator while moving plasma current sheath inside chambers interacting with b-electrons generated due to the decay of *** of tritium is also accompanied by the accumulation of *** lead to a decreased yield of neutron emission from plasma focus chambers,especially for long term *** paper presents an option of absorption type gas generator in the chamber based on porous titanium,which allows to significantly increase the lifetime and shelf life of tritium *** also shows the results of experiments on the comparison of the operation of sealed plasma focus chambers with and without the gas generator.

关键词： Plasma focus neutron yield Tritium-filled plasma focus chambers