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 of Modern Physics Chinese Academy of Science Lanzhou 730000 China
2 School of Nuclear Science and Technology University of Chinese Academy of Science Beijing 100049 China
With the advantages of short duration and extreme brightness, laser proton accelerators (LPAs) show great potential in many fields for industrial, medical, and research applications. However, the quality of current laser-driven proton beams, such as the broad energy spread and large divergence angle, is still a challenge. We use numerical simulations to study the propagation of such proton bunches in the plasma. Results show the bunch will excite the wakefield and modulate itself. Although a small number of particles at the head of the bunch cannot be manipulated by the wakefield, the total energy spread is reduced. Moreover, while reducing the longitudinal energy spread, the wakefield will also pinch the beam in the transverse direction. The space charge effect of the bunch is completely offset by the wakefield, and the transverse momentum of the bunch decreases as the bunch transports in the plasma. For laser-driven ion beams, our study provides a novel idea about the optimization of these beams.
Laser and Particle Beams
2022, 2022(1): 4286598
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
2022, 34(6): 064010
强激光与粒子束
2021, 33(1): 012005
Author Affiliations
Abstract
1 Department of Engineering Physics, Tsinghua University, Beijing 100084, China
2 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
3 Xi’an Jiaotong University, Xi’an 710049, China
4 Institute of Applied Electronics, CAEP, Mianyang 621900, China
High-energy electron radiography (HEER) is a promising diagnostic tool for high-energy-density physics, as an alternative to tools such as X/γ-ray shadowgraphy and high-energy proton radiography. Impressive progress has been made in the development and application of HEER in the past few years, and its potential for high-resolution imaging of static opaque objects has been proved. In this study, by taking advantage of the short pulse duration and tunable time structure of high-energy electron probes, time-resolved imaging measurements of high-energy-density gold irradiated by ultrashort intense laser pulses are performed. Phenomena at different time scales from picoseconds to microseconds are observed, thus proving the feasibility of this technique for imaging of static and dynamic objects.
Matter and Radiation at Extremes
2019, 4(6): 065402
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
1 FAIR GmbH: Facility for Antiproton and Ion Research in Europe GmbH, Planckstrae 1, 64291 Darmstadt, Germany
2 National Research Nuclear University MEPhI, Moscow, Russia National Research Nuclear University MEPhI, Kashirskoe shosse, 31, 115409 Moscow, Russia
3 Institut fu¨r Kernphysik, Technische Universit€at Darmstadt, Schlossgartenstrasse 9, 64289 Darmstadt, Germany
4 Institute of Modern Physics, CAS, Lanzhou 730000, PR China
5 State Scientific Center Russian Federation e Institute for Theoretical and Experimental Physics of National Research Center “Kurchatov Institute” (SSC RF ITEP of NRC “Kurchatov Institute”), FSBI SSC RF ITEP, Bolshaya Cheremushkinskaya, 25, 117218 Moscow, Russia
6 School of Science, Xi'an Jiaotong University and Institute of Modern Physics, CAS, Xianning West Road 28#, Xi'an 710049, PR China
We review the development of High Energy Density Physics (HEDP) with intense heavy ion beams as a tool to induce extreme states of matter. The development of this field connects intimately to the advances in accelerator physics and technology. We will cover the generation of intense heavy ion beams starting from the ion source and follow the acceleration process and transport to the target. Intensity limitations and potential solutions to overcome these limitations are discussed. This is exemplified by citing examples from existing machines at the Gesellschaft fur Schwerionenforschung (GSI-Darmstadt), the Institute of Theoretical and Experimental Physics in Moscow (ITEP-Moscow), and the Institute of Modern Physics (IMP-Lanzhou). Facilities under construction like the FAIR facility in Darmstadt and the High Intensity Accelerator Facility (HIAF), proposed for China will be included. Developments elsewhere are covered where it seems appropriate along with a report of recent results and achievements.
High energy density physics Ion driven fusion Warm dense matter Matter and Radiation at Extremes
2016, 1(1): 28