1 咸阳师范学院离子束与光物理实验室,陕西 咸阳 712000
2 西安交通大学物理学院,陕西 西安 710049
3 中国科学院近代物理研究所,甘肃 兰州 730000
用动能为1360 keV的129Xeq+(q=17,20,23,25,27)高电荷态离子分别入射到金属Al和Ti固体靶表面,测量高电荷离子与表面相互作用过程中离子俘获表面电子完成中性化所形成的激发态Xe原子和低电离态Xe离子退激辐射的近红外光谱线(800~1700 nm),以及靶原子被离化激发、退激辐射的光谱线。实验结果表明:高电荷态离子入射金属表面的过程中,携带的势能在飞秒量级的时间内沉积到靶表面,使靶原子离化激发,较强的库仑势能可使靶原子形成高离化态和复杂的电子组态、退激辐射光谱线。随着入射离子的电荷态增加,测量谱线的强度增大,该变化趋势与入射离子的势能随电荷增加的变化趋势大体一致,说明经典过垒模型在近玻尔速度能区是成立的。
原子与分子物理学 高电荷态离子 经典过垒模型 禁戒跃迁 近红外光谱
Author Affiliations
Abstract
1 MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of Physics Xi’an Jiaotong University Xi’an 710049 China
2 Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730070 China
3 Science and Technology on Plasma Physics Laboratory Laser Fusion Research Center China Academy of Engineering Physics Mianyang 621900 China
4 Hebei Key Laboratory of Compact Fusion Langfang 065001 China
5 ENN Science and Technology Development Co., Ltd. Langfang 065001 China
In preparation for an experiment with a laser-generated intense proton beam at the Laser Fusion Research Center at Mianyang to investigate the 11B(p,α)2α reaction, we performed a measurement at very low proton energy between 140 keV and 172 keV using the high-voltage platform at the Institute of Modern Physics, Lanzhou. The aim of the experiment was to test the ability to use CR-39 track detectors for cross-section measurements and to remeasure the cross-section of this reaction close to the first resonance using the thick target approach. We obtained the cross-section σ = 45.6 12.5 mb near 156 keV. Our result confirms the feasibility of CR-39 type track detector for nuclear reaction measurement also in low-energy regions.
Laser and Particle Beams
2023, 2023(1): 9697329
Author Affiliations
Abstract
1 Institute for Fusion Theory and Simulation Department of Physics Zhejiang University Hangzhou 310027 China
2 Key Laboratory for Laser Plasmas and School of Physics and Astronomy, and Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiao Tong University Shanghai 200240 China
3 MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of Physics, Xi’an Jiaotong University Xi’an 710049 China
4 Technische Universität Darmstadt Institut für Kernphysik Schloβgartenstraβe Darmstadt 64289 Germany
The proton-boron (p B) reaction is regarded as the holy grail of advanced fusion fuels, where the primary reaction produces 3 energetic particles. However, due to the high nuclear bounding energy and bremsstrahlung energy losses, energy gain from the p B fusion is hard to achieve in thermal fusion conditions. Owing to advances in intense laser technology, the p B fusion has drawn renewed attention by using an intense laser-accelerated proton beam to impact a boron-11 target. As one of the most influential works in this field, Labaune et al. first experimentally found that states of boron (solid or plasma) play an important role in the yield of particles. This exciting experimental finding rouses an attempt to measure the nuclear fusion cross section in a plasma environment. However, up to now, there is still no quantitative explanation. Based on large-scale, fully kinetic computer simulations, the inner physical mechanism of yield increment is uncovered, and a quantitative explanation is given. Our results indicate the yield increment is attributed to the reduced energy loss of the protons under the synergetic influences of degeneracy effects and collective electromagnetic effects. Our work may serve as a reference for not only analyzing or improving further experiments of the p B fusion but also investigating other beam-plasma systems, such as ion-driven inertial confinement fusions.
Laser and Particle Beams
2022, 2022(3): 9868807
Author Affiliations
Abstract
1 MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of Physics Xi’an Jiaotong University Xi’an 710049 China
2 Science and Technology on Plasma Physics Laboratory Laser Fusion Research Center China Academy of Engineering Physics Mianyang 621900 China
3 Xi’an Technological University Xi’an 710021 China
4 Advanced Materials Testing Technology Research Center Shenzhen University of Technology Shenzhen 518118 China
5 Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730070 China
6 State Key Laboratory of Laser Interaction with Matter Northwest Institute of Nuclear Technology Xi’an 710049 China
The laboratory generation and diagnosis of uniform near-critical-density (NCD) plasmas play critical roles in various studies and applications, such as fusion science, high energy density physics, astrophysics as well as relativistic electron beam generation. Here we successfully generated the quasistatic NCD plasma sample by heating a low-density tri-cellulose acetate (TCA) foam with the high-power-laser-driven hohlraum radiation. The temperature of the hohlraum is determined to be 20 eV by analyzing the spectra obtained with the transmission grating spectrometer. The single-order diffraction grating was employed to eliminate the high-order disturbance. The temperature of the heated foam is determined to be T = 16.8 ± 1.1 eV by analyzing the high-resolution spectra obtained with a flat-field grating spectrometer. The electron density of the heated foam is about under the reasonable assumption of constant mass density.
Laser and Particle Beams
2022, 2022(2): 3049749
强激光与粒子束
2021, 33(1): 012005
Author Affiliations
Abstract
1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 School of Science, Xi'an Jiaotong University, Xi'an 710049, China
4 Department of Engineering Physics, Tsinghua University, Beijing 100084, China
The research activities on warm dense matter driven by intense heavy ion beams at the new project High Intensity heavy-ion Accelerator Facility (HIAF) are presented. The ion beam parameters and the simulated accessible state of matter at HIAF are introduced, respectively. The progresses of the developed diagnostics for warm dense matter research including high energy electron radiography, multiple-channel pyrometer, in-situ energy loss and charge state of ion detector are briefly introduced.
Warm dense matter Intense heavy ion beams HIAF Electron radiography Matter and Radiation at Extremes
2018, 3(2): 85
Author Affiliations
Abstract
1 College of Science, Dalian Maritime University, Dalian 116026, China
2 School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
3 School of Science, Xi'an Jiaotong University, Xi'an 710049, China
We summarize our theoretical studies for stopping power of energetic heavy ion, diatomic molecular ions and small clusters penetrating through plasmas. As a relevant research field for the heavy ion inertial confinement fusion (HICF), we lay the emphasis on the dynamic polarization and correlation effects of the constituent ion within the molecular ion and cluster for stopping power in order to disclose the role of the vicinage effect on the Coulomb explosion and energy deposition of molecules and clusters in plasma. On the other hand, as a promising scheme for ICF, both a strong laser field and an intense ion beam are used to irradiate a plasma target. So the influence of a strong laser field on stopping power is significant. We discussed a large range of laser and plasma parameters on the coulomb explosion and stopping power for correlated-ion cluster and C60 cluster. Furthermore, in order to indicate the effects of different cluster types and sizes on the stopping power, a comparison is made for hydrogen and carbon clusters. In addition, the deflection of molecular axis for diatomic molecules during the Coulomb explosion is also given for the cases both in the presence of a laser field and laser free. Finally, a future experimental scheme is put forward to measure molecular ion stopping power in plasmas in Xi’an Jiaotong University of China.
Molecules Stopping power Coulomb explosion Vicinage effect Laser Matter and Radiation at Extremes
2018, 3(2): 67
Author Affiliations
Abstract
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
Recent research activities relevant to high energy density physics (HEDP) driven by the heavy ion beam at the Institute of Modern Physics, Chinese Academy of Sciences are presented. Radiography of static objects with the fast extracted high energy carbon ion beam from the Cooling Storage Ring is discussed. Investigation of the low energy heavy ion beam and plasma interaction is reported. With HEDP research as one of the main goals, the project HIAF (High Intensity heavy-ion Accelerator Facility), proposed by the Institute of Modern Physics as the 12th five-year-plan of China, is introduced.
heavy ion beam high energy density physics ion beam and plasma interaction radiography High Power Laser Science and Engineering
2014, 2(4): 04000e39