Keyword: laser
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SUPAF05 Polarized Proton Beams From Laser-Induced Plasmas proton, polarization, target, plasma 46
  • M. Büscher, J. Böker, R. Engels, I. Engin, R. Gebel, A. Hützen, A. Lehrach
    FZJ, Jülich, Germany
  • A.M. Pukhov, J. Thomas
    HHUD, Dusseldorf, Germany
  • T. P. Rakitzis, D. Sofikitis
    University of Crete, Heraklion, Crete, Greece
  Laser-driven particle acceleration has undergone impressive progress in recent years. Nevertheless, one unexplored issue is how the particle spins are influenced by the huge magnetic fields inherently present in the plasmas. In the framework of the JuSPARC (Jülich Short-Pulse Particle and Radiation Center) facility and of the ATHENA consortium, the laser-driven generation of polarized particle beams in combination with the development of advanced target technologies is being pursued. In order to predict the degree of beam polarization from a laser-driven plasma accelerator, particle-in-cell simulations including spin effects have been carried out for the first time. For this purpose, the Thomas-BMT equation, describing the spin precession in electromagnetic fields, has been implemented into the VLPL (Virtual Laser Plasma Lab) code. A crucial result of our simulations is that a target containing pre-polarized hydrogen nuclei is needed for producing highly polarized relativistic proton beams. For the experimental realization, a polarized HCl gas-jet target is under construction the Forschungszentrum Jülich where the degree of hydrogen polarization is measured with a Lamb-shift polarimeter. The final experiments, aiming at the first observation of a polarized particle beam from laser-generated plasmas, will be carried out at the 10 PW laser system SULF at SIOM/Shanghai.  
slides icon Slides SUPAF05 [3.927 MB]  
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About • paper received ※ 19 October 2018       paper accepted ※ 24 October 2018       issue date ※ 26 January 2019  
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MOPLG01 Challenges in Simulating Beam Dynamics of Dielectric Laser Acceleration electron, focusing, experiment, acceleration 120
  • U. Niedermayer, O. Boine-Frankenheim, T. Egenolf, E. Skär
    TEMF, TU Darmstadt, Darmstadt, Germany
  • A. Adelmann, S. Bettoni, M. Calvi, M.M. Dehler, E. Ferrari, F. Frei, D. Hauenstein, B. Hermann, N. Hiller, R. Ischebeck, C. Lombosi, E. Prat, S. Reiche, L. Rivkin
    PSI, Villigen PSI, Switzerland
  • R.W. Aßmann, U. Dorda, M. Fakhari, I. Hartl, W. Kuropka, F. Lemery, B. Marchetti, F. Mayet, H. Xuan, J. Zhu
    DESY, Hamburg, Germany
  • D.S. Black, P. N. Broaddus, R.L. Byer, A.C. Ceballos, H. Deng, S. Fan, J.S. Harris, T. Hirano, Z. Huang, T.W. Hughes, Y. Jiang, T. Langenstein, K.J. Leedle, Y. Miao, A. Pigott, N. Sapra, O. Solgaard, L. Su, S. Tan, J. Vuckovic, K. Yang, Z. Zhao
    Stanford University, Stanford, California, USA
  • H. Cankaya, A. Fallahi, F.X. Kärtner
    CFEL, Hamburg, Germany
  • D.B. Cesar, P. Musumeci, B. Naranjo, J.B. Rosenzweig, X. Shen
    UCLA, Los Angeles, USA
  • B.M. Cowan
    Tech-X, Boulder, Colorado, USA
  • R.J. England
    SLAC, Menlo Park, California, USA
  • E. Ferrari, L. Rivkin
    EPFL, Lausanne, Switzerland
  • T. Feurer
    Universität Bern, Institute of Applied Physics, Bern, Switzerland
  • P. Hommelhoff, A. Li, N. Schönenberger, R. Shiloh, A.D. Tafel, P. Yousefi
    University of Erlangen-Nuremberg, Erlangen, Germany
  • Y.-C. Huang
    NTHU, Hsinchu, Taiwan
  • J. Illmer, A.K. Mittelbach
    Friedrich-Alexander Universität Erlangen-Nuernberg, University Erlangen-Nuernberg LFTE, Erlangen, Germany
  • F.X. Kärtner
    Deutsches Elektronen Synchrotron (DESY) and Center for Free Electron Science (CFEL), Hamburg, Germany
  • W. Kuropka, F. Mayet
    University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
  • Y.J. Lee, M. Qi
    Purdue University, West Lafayette, Indiana, USA
  • E.I. Simakov
    LANL, Los Alamos, New Mexico, USA
  Funding: ACHIP is funded by the Gordon and Betty Moore Foundation (Grant No. GBMF4744). U.N. acknowledges German BMBF Grant No. FKZ:05K16RDB. B.C. acknowledges NERSC, Contract No. DE-AC02-05CH11231.
Dielectric Laser Acceleration (DLA) achieves the high- est gradients among structure-based electron accelerators. The use of dielectrics increases the breakdown field limit, and thus the achievable gradient, by a factor of at least 10 in comparison to metals. Experimental demonstrations of DLA in 2013 led to the Accelerator on a Chip International Program (ACHIP), funded by the Gordon and Betty Moore Foundation. In ACHIP, our main goal is to build an acceler- ator on a silicon chip, which can accelerate electrons from below 100keV to above 1MeV with a gradient of at least 100MeV/m. For stable acceleration on the chip, magnet- only focusing techniques are insufficient to compensate the strong acceleration defocusing. Thus spatial harmonic and Alternating Phase Focusing (APF) laser-based focusing tech- niques have been developed. We have also developed the simplified symplectic tracking code DLAtrack6D, which makes use of the periodicity and applies only one kick per DLA cell, which is calculated by the Fourier coefficient of the synchronous spatial harmonic. Due to coupling, the Fourier coefficients of neighboring cells are not entirely independent and a field flatness optimization (similarly as in multi-cell cavities) needs to be performed. The simu- lation of the entire accelerator on a chip by a Particle In Cell (PIC) code is possible, but impractical for optimization purposes. Finally, we have also outlined the treatment of wake field effects in attosecond bunches in the grating within DLAtrack6D, where the wake function is computed by an external solver.
slides icon Slides MOPLG01 [3.947 MB]  
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About • paper received ※ 20 October 2018       paper accepted ※ 24 October 2018       issue date ※ 26 January 2019  
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MOPAG02 Efficient Modeling of Laser Wakefield Acceleration Through the PIC Code Smilei in CILEX Project plasma, simulation, electron, electromagnetic-fields 160
  • F. Massimo, A. Beck, A. Specka, I. Zemzemi
    LLR, Palaiseau, France
  • J. Derouillat
    Maison de la Simulation, CEA, Gif-sur-Yvette, France
  • M. Grech, F. Pérez
    LULI, Palaiseau, France
  The design of plasma acceleration facilities requires considerable simulation effort for each part of the machine, from the plasma injector and/or accelerator stage(s), to the beam transport stage, from which the accelerated beams will be brought to the users or possibly to another plasma stage. The urgent issues and challenges in simulation of multi-stage acceleration with the Apollon laser of CILEX facility will be addressed. To simulate the beam injection in the second plasma stage, additional physical models have been introduced and tested in the open source Particle in Cell collaborative code Smilei. The efficient initialisation of arbitrary relativistic particle beam distributions through a Python interface allowing code coupling and the self consistent initialisation of their electromagnetic fields will be presented. The comparison between a full PIC simulation and a simulation with a recently developed envelope model, which allows to drastically reduce the computational time, will be also shown for a test case of laser wakefield acceleration of an externally injected electron beam.  
slides icon Slides MOPAG02 [20.462 MB]  
DOI • reference for this paper ※  
About • paper received ※ 15 October 2018       paper accepted ※ 24 October 2018       issue date ※ 26 January 2019  
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TUPAF14 Analytical Calculations for Thomson Backscattering Based Light Sources electron, radiation, scattering, HOM 215
  • P.I. Volz, A. Meseck
    HZB, Berlin, Germany
  There is a rising interest in Thomson-backscattering based light sources, as scattering intense laser radiation on MeV electrons produces high energy photons that would require GeV or even TeV electron beams when using conventional undulators or dipoles. Particularly, medium energy high brightness beams delivered by LINACs or Energy Recovery LINACs, such as BERLinPro being built at Helmholtz-Zentrum Berlin, seem suitable for these sources. In order to study the merit of Thomson-backscattering-based light sources, we are developing an analytical code to simulate the characteristics of the Thomson scattered radiation. The code calculates the distribution of scattered radiation depending on the incident angle and polarization of the laser radiation. Also the impact of the incident laser profile and the full 6D bunch profile, including microbunching, are incorporated. The Status of the code and first results will be presented.  
slides icon Slides TUPAF14 [3.289 MB]  
DOI • reference for this paper ※  
About • paper received ※ 21 October 2018       paper accepted ※ 28 January 2019       issue date ※ 26 January 2019  
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WEPAF01 A Compact Permanent Magnet Spectrometer for CILEX electron, dipole, permanent-magnet, simulation 320
  • M. Khojoyan, A. Cauchois, J. Prudent, A. Specka
    LLR, Palaiseau, France
  Laser Wakefield acceleration experiments make exten- sive use of small permanent magnets or magnet assemblies for analyzing and focusing electron beams produced in plasma accelerators. Besides being compact, these magnets have to have a large angular acceptance for the divergent laser and electron beams which imposes constraint of the gap size. We will present the optimized design and charac- terization of a 100 mm long, 2.1 Tesla permanent magnet dipole. Furthermore, we will present the performance of such a magnet as a spectrometer in the CILEX/APOLLON 10PW laser facility in France.  
slides icon Slides WEPAF01 [6.898 MB]  
DOI • reference for this paper ※  
About • paper received ※ 15 October 2018       paper accepted ※ 28 January 2019       issue date ※ 26 January 2019  
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WEPLG05 Review of Spectral Maxwell Solvers for Electromagnetic Particle-in-Cell: Algorithms and Advantages plasma, simulation, electron, distributed 345
  • R. Lehé, J.-L. Vay
    LBNL, Berkeley, California, USA
  Electromagnetic Particle-In-Cell codes have been used to simulate both radio-frequency accelerators and plasma-based accelerators. In this context, the Particle-In-Cell algorithm often uses the finite-difference method in order to solve the Maxwell equations. However, while this method is simple to implement and scales well to multiple processors, it is liable to a number of numerical artifacts that can be particularly serious for simulations of accelerators. An alternative to the finite-difference method is the use of spectral solvers, which are typically less prone to numerical artifacts. In this talk, I will review recent progress in the use of spectral solvers for simulations of plasma-based accelerators. This includes techniques to scale those solvers to large number of processors, extensions to cylindrical geometry, and adaptations to specific problems such as boosted-frame simulations.  
slides icon Slides WEPLG05 [2.861 MB]  
DOI • reference for this paper ※  
About • paper received ※ 06 November 2018       paper accepted ※ 28 January 2019       issue date ※ 26 January 2019  
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