Author Affiliations
1 Technische Universität Darmstadt Darmstadt Institut für Teilchenbeschleunigung und Elektromagnetische Felder (TEMF) Schlossgartenstr. 8 64289 Darmstadt Germany
2 University of Cambridge Department of Applied Mathematics and Theoretical Physics (DAMTP) Centre for Mathematical Sciences Wilberforce Road Cambridge CB3 0WA UK
3 GSI Helmholtzzentrum für Schwerionenforschung GmbH Planckstr. 1 64291 Darmstadt Germany
Liquid leaf targets show promise as high repetition rate targets for laser-based ion acceleration using the Target Normal Sheath Acceleration (TNSA) mechanism and are currently under development. In this work, we discuss the effects of different ion species and investigate how they can be leveraged for use as a possible laser-driven neutron source. To aid in this research, we develop a surrogate model for liquid leaf target laser-ion acceleration experiments, based on artificial neural networks. The model is trained using data from Particle-In-Cell (PIC) simulations. The fast inference speed of our deep learning model allows us to optimize experimental parameters for maximum ion energy and laser-energy conversion efficiency. An analysis of parameter influence on our model output, using Sobol’ and PAWN indices, provides deeper insights into the laser-plasma system.
Laser and Particle Beams
2023, 2023(3): 2868112
Author Affiliations
1 ELI Beamlines Facility, The Extreme Light Infrastructure ERIC, Dolní Břežany, Czech Republic
2 Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic
An optical probing of laser–plasma interactions can provide time-resolved measurements of plasma density; however, single-shot and multi-frame probing capabilities generally rely on complex setups with limited flexibility. We have demonstrated a new method for temporal resolution of the rapid dynamics ( $\sim 170$ fs) of plasma evolution within a single laser shot based on the generation of several consecutive probe pulses from a single beta barium borate-based optical parametric amplifier using a fraction of the driver pulse with the possibility to adjust the central wavelengths and delays of particular pulses by optical delay lines. The flexibility and scalability of the proposed experimental technique are presented and discussed.
off-harmonic optical probing plasma diagnostics ultrafast imaging 
High Power Laser Science and Engineering
2023, 11(4): 04000e45
Author Affiliations
1 University of Bordeaux CNRS CEA CELIA (Centre Lasers Intenses et Applications) F-33405 Talence France
2 HB11 Energy Holdings Pty 11 Wyndora Ave Freshwater NSW 2096 Australia
3 ELI Beamlines Facility The Extreme Light Infrastructure ERIC Dolni Brezany Czech Republic
4 Centre for Light-Matter Interactions School of Mathematics and Physics Queen’s University Belfast Belfast UK
5 School of Electrical Engineering and Telecommunications Faculty of Engineering UNSW Sydney Kensington Australia
The topic of proton-boron fusion has recently attracted considerable interest in the scientific community, both for its future perspectives for energy production and for nearer-term possibilities to realize high-brightness α-particle sources. Very interesting experimental results have been obtained, in particular in laser-driven experiments but also using other experimental approaches. The goal of this special issue is to collect the most recent developments in experiments, theory, advanced targetry, diagnostics, and numerical simulation codes.
Laser and Particle Beams
2023, 2023(2): 9824024
Author Affiliations
1 ENEA Fusion and Technology for Nuclear Safety and Security Department C.R. Frascati Rome Italy
2 University of Pisa Physics Department E. Fermi Pisa Italy
The energy problem is an open issue becoming increasingly pressing. The possibility to use nuclear fusion as an alternative energy source is thus acquiring progressively more importance and many investors are pushing to achieve the goal of an electric plant based on fusion. The most studied reaction is the deuterium-tritium one, but this poses several technical issues related to the handling of the radioactive fuel and neutron generation. In this frame, the aneutronic 11B(p, α)2α fusion reaction has attracted the interest of many researchers. Despite a fusion reactor based on pB is still a long-term goal, the study of this reaction is important both for astrophysics research and for its possible employment in schemes of high brightness source of α particles for applications, as for instance in medicine. Nevertheless, the univocal identification of the produced alphas is a well-known challenging task when the reaction is triggered by high-intensity lasers. Indeed, due to the multifaceted emission typical of laser-matter interactions, the signal coming from alphas is often superimposed to that generated by protons and by other ions, and in many cases, it is therefore hardly recognizable. In this work, we analysed the possibility of employing a Thomson spectrometer (TS) with an adequate differential filtering system for the exclusion from the α-particle trace, the contribution of all other ionic species. Moreover, for the energy ranges where the filtering method cannot be successfully applied, we investigated the feasibility of integrating in the TS assembly a particle detector for time-of-flight (TOF) measurements.
Laser and Particle Beams
2023, 2023(2): 7831712
Author Affiliations
1 ELI Beamlines Facility The Extreme Light Infrastructure ERIC Dolni Brezany Czech Republic
2 Institute of Plasma Physics & Laser Microfusion (IPPLM) Warsaw Poland
3 Southern National Laboratory (LNS) Istituto Nazionale Fisica Nucleare Catania Italy
4 Czech Technical University in Prague Faculty of Nuclear Sciences and Physical Engineering Prague Czech Republic
5 FZU-Institute of Physics Czech Academy of Sciences Prague Czech Republic
6 Institute of Plasma Physics Czech Academy of Sciences Prague Czech Republic
7 Micro-Nano Facility Fondazione Bruno Kessler Trento 38123 Italy
8 Centre for Light-Matter Interactions School of Mathematics and Physics Queen’s University Belfast Belfast UK
Solid-state nuclear track detectors (CR-39 type) are frequently used for the detection of ions accelerated by laser-plasma interaction because they are sensitive to each single particle. To the present day, CR-39 detectors are the main diagnostics in experiments focused on laser-driven proton-boron (p11B) fusion reactions to detect alpha particles, which are the main products of such a nuclear reaction, and to reconstruct their energy distribution. However, the acceleration of multispecies ions in the laser-generated plasma makes this spectroscopic method complex and often does not allow to unambiguously discriminate the alpha particles generated from p11B fusion events from the laser-driven ions. In this experimental work, performed at the PALS laser facility (600 J, 300 ps, laser intensity 1016 W/cm2), CR-39 detectors were used as main detectors for the angular distribution of the produced alpha particles during a p11B fusion dedicated experimental campaign. Additionally, a CR-39 detector was set inside a Thomson Parabola (TP) spectrometer with the aim to calibrate the CR-39 response for low energetic laser-driven ions originating from the plasma in the given experimental conditions. The detected ion energies were ranging from hundreds of keV to a few MeV, and the ion track diameters were measured for etching times up to 9 hours. The goal of the test was the evaluation of the detectors’ ability to discriminate the alpha particles from the aforementioned ions. Within this study, the calibration curves for protons and silicon low energy ions are accomplished, the overlapping of the proton tracks and alpha particles is verified, and a methodology to avoid this problem is realized.
Laser and Particle Beams
2023, 2023(1): 3125787
Author Affiliations
Institute of Fluid Physics China Academy of Engineering Physics P.O. Box 919-106 Mianyang 621900 China
A low-energy proton accelerator named pulsed synchronous linear accelerator (PSLA) is proposed and developed at the Institute of Fluid Physics, which is driven by unipolar-pulsed high voltages. Pulsed-accelerating electric fields and low-energy ion beams are precisely synchronized on temporal and spatial positions for continuous acceleration. The operating mode and the features of the PSLA are introduced. At present, the feasibility of a low-energy proton PSLA has been verified in principle. An average accelerating gradient up to 3 MV/m for protons is achieved.
Laser and Particle Beams
2022, 2022(1): 2836767
Author Affiliations
1 Mehlhorn Engineering Consulting Services Beaverton 97003 OR USA
2 HB11 Energy Holdings Pty 11 Wyndora Ave Freshwater 2096 NSW Australia
3 Department of Physics University of Texas Austin 78712 TX USA
4 Centre for Plasma Physics Queen’s University of Belfast Belfast BT7 1NN UK
5 ELI Beamlines Facility The Extreme Light Infrastructure ERIC Dolni Brezany 252 41 Czech Republic
6 Prism Computational Sciences Madison Wisconsin USA
7 University of Bordeaux CNRS CEA CELIA (Centre Lasers Intenses et Applications) Talence F-33405 France
8 MCM Consulting San Diego 97127 CA USA
9 Laboratory for Laser Energetics University of Rochester Rochester 14623 New York USA
The Lawson criterion for proton-boron (p-11B) thermonuclear fusion is substantially higher than that for deuterium-tritium (DT) because the fusion cross section is lower and peaks at higher ion energies. The Maxwellian averaged p-11B reactivity peaks at several hundred keV, where bremsstrahlung radiation emission may dominate over fusion reactions if electrons and ions are in thermal equilibrium and the losses are unrestricted. Nonequilibrium burn has often been suggested to realize the benefits of this aneutronic reaction, but the predominance of elastic scattering over fusion reactivity makes this difficult to achieve. The development of ultrashort pulse lasers (USPL) has opened new possibilities for initiating nonequilibrium thermonuclear burns and significant numbers of p-11B alpha particles have been reported from several experiments. We present an analysis that shows that these significant alpha yields are the result of beam fusion reactions that do not scale to net energy gain. We further find that the yields can be explained by experimental parameters and recently updated cross sections such that a postulated avalanche mechanism is not required. We use this analysis to understand the underlying physics of USPL-driven nonequilibrium fusion reactions and whether they can be used to initiate fusion burns. We conclude by outlining a path to increasing the p-11B reactivity towards the goal of achieving ignition and describing the design principles that we will use to develop a computational point design.
Laser and Particle Beams
2022, 2022(1): 2355629

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。