The emergence of a new era reaching beyond current state-of-the-art ultrashort and ultraintense laser technology has been enabled by the approval of around € 850 million worth of structural funds in 2011–2012 by the European Commission for the installation of Extreme Light Infrastructure (ELI). The ELI project consists of three pillars being built in the Czech Republic, Hungary, and Romania. This challenging proposal is based on recent technical progress allowing ultraintense laser fields in which intensities will soon be reaching as high as I0 ∼ 1023 W cm−2. This tremendous technological advance has been brought about by the invention of chirped pulse amplification by Mourou and Strickland. Romania is hosting the ELI for Nuclear Physics (ELI-NP) pillar in Măgurele near Bucharest. The new facility, currently under construction, is intended to serve the broad national, European, and international scientific community. Its mission covers scientific research at the frontier of knowledge involving two domains. The first is laser-driven experiments related to NP, strong-field quantum electrodynamics, and associated vacuum effects. The second research domain is based on the establishment of a Compton-backscattering-based, high-brilliance, and intense γ beam with Eγ ≲ 19.5 MeV, which represents a merger between laser and accelerator technology. This system will allow the investigation of the nuclear structure of selected isotopes and nuclear reactions of relevance, for example, to astrophysics with hitherto unprecedented resolution and accuracy. In addition to fundamental themes, a large number of applications with significant societal impact will be developed. The implementation of the project started in January 2013 and is spearheaded by the ELI-NP/Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH). Experiments will begin in early 2020.
Radiation reaction (RR) force plays an important role in gamma ray production in the interaction of ultraintense laser with relativistic electron beams at the laser intensity beyond 10 22 W/cm 2 . The relationship between emission spectrum and initial kinetic energy of the electrons at such intensities has not been studied experimentally yet. The energy from both the relativistic electron beams and laser pulse may be converted into the gamma rays. Therefore, Professor Hosaka Atsushi for willing to become my new supervisor after the retirement of Professor Hideaki Takabe from Osaka University. Next, many thanks to Dr. T. Moritaka for guidances and advice on computer simulation throughout the research. Thanks to Teo Wei Ren, Wadagaki Tomoya for supports during the stay at Osaka. I would also like to thank Maxim Barkov for fruitful discussion. Besides, I would like to thank Professor Tom Cowan and R. Sauerbrey, HZDR, for their interest in the present research and encouragement during our research at Dresden, Germany. Thanks to Dr. Huang Lin Gen, Melanie Rödel and group members of HIBEF committee for useful discussion and support during my stay at HZDR. This work was partially supported by the General Coordinated Research program at National Institute for Fusion Science (NIFS13KNSS039) and also computer facilities at Cybermedia Center of Osaka University. Last but not least, I would like to thanks to my parents for their support and encouragement in my Ph.D. study. v vi Contents List of Figures ix A.1 Spectrum of bremsstrahlung gamma-quanta that hit the sample of the studied substance for a tungsten bremsstrahlung target 0.1 mm thick. Curves
We present an integrated study on the scalability and performance of particle-in-cell (PIC) code simulations on CPU and GPU architectures of high parallelization focused on target normal sheath acceleration (TNSA) and laser wakefield acceleration (LWFA) experiments. The developed models follow the experimental specifications of the high-power lasers systems hosted at the infrastructures of the Institute of Plasma Physics & Lasers of the Hellenic Mediterranean University in Crete, Greece and the Extreme Light Infrastructure -Nuclear Physics in Romania. The simulations are implemented on the High-Performance Computer for Advanced Research Information System of the Greek National Infrastructures for Research and Technology. Two representative experiments for TNSA and for LWFA are initially simulated by 2D models with the minimum computational resource demands and the results are used as a reference for the scalability and performance investigation. We further extend our study to 3D models aiming to reproduce the physics involved in both laser-plasma particle accelerators. A detailed analysis of the simulation results, accompanied with the computational demands, scalability and performance of the CPU and the GPU architectures, is provided. Our research findings highlight the key features and parameters of the physical and numerical models which drive simulations to converge to reliable results by means of physics, computational and runtime demands and shed light on their influence on the efficiency and performance of the PIC simulations.
The laser field depletion in laser-electron beam collision is generally small. However, a properly chosen parameter of the laser and electron, the laser field depletion can be optimized. To access the laser energy evolution, simulations of laser-electron beam collision by Particle-in-Cell (PIC) simulation is performed. In this paper, the laser and electron parameters are chosen such that the ponderomotive force is compensated by the radiation reaction force in the head-on collision configuration. Then, the relativistic electron beam can quiver in the laser pulse for a longer time to increase the energies conversion. The optimum of laser field energy depletion is observed at γ0 = a0 ∼ 400 and limited beyond this point due to the impenetrability threshold. The total energy conversion from laser and electron beam into radiation emission is optimum at γ0 = a0 ∼ 250. This conversion efficiency can be up to several percent for an electron bunch with charges of a few nC. This efficient gamma-ray sources may provide some useful application in photonuclear experiments.
The energy conversion in laser-electron beam collision is typically small. However, with a properly chosen parameter of the laser and electron beam, the energy conversion can be optimized. In this paper, the laser and electron parameters are selected such that the ponderomotive force is compensated by the radiation reaction force in the head-on collision configuration. Then, the relativistic electron beam can quiver in the laser pulse for a longer time to increase the energy conversion. To access the laser energy evolution, simulations of laser-electron beam collision by the Particle-in-Cell method are performed. The optimum of laser field energy depletion is observed at γ0 = a0 ∼ 400 and limited beyond this point due to the impenetrability threshold. The total energy conversion into radiation emission is optimum at γ0 = a0 ∼ 250. We estimated that the conversion efficiency can be up to 11% for an electron bunch with charge of the order of 100 nC. The efficient gamma-ray sources are of great interest for applications in photonuclear experiments.
We study the νe − e scattering from low to ultrahigh energy in the framework of Higgs Triplet Model (HTM). We add the contribution of charged Higgs boson exchange to the total cross section of the scattering. We obtain the upper bound hee/M H ± 2.8 × 10 −3 GeV −1 in this process from low energy experiment. We show that by using the upper bound obtained, the charged Higgs contribution can give enhancements to the total cross section with respect to the SM prediction up to 5.16 % at E ≤ 10 14 eV and maximum at s ≈ M 2 H ± and would help to determine the feasibility experiments to discriminate between SM and HTM at current available facilities.
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