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  1. AU="Jalas, Sören"
  2. AU="Suma, Rache"
  3. AU="Calderón, Alejandro"
  4. AU="Demertzi, Vasiliki"
  5. AU="Leonidov, A"
  6. AU="Luo, Suxin"
  7. AU="Thompson, Charlotte A S"
  8. AU="Dubbel, Polly"
  9. AU="Ten Bosch, Nora"
  10. AU="Giménez-Arnau, Ana Maria"
  11. AU=Maul Robert W.
  12. AU="Ivn Prez-MaldonadoauthorLaboratorio de Toxicologa Molecular, Centro de Investigacin Aplicada en Ambiente y Salud (CIAAS), Coordinacin para la Innovacin y Aplicacin de la Ciencia y la Tecnologa (CIACYT), Universidad Autnoma de San Luis Potos, MexicoFacultad de Medicina, Universidad Autnoma de San Luis Potos, San Luis Potos, MexicoFacultad de Enfermera, Universidad Autnoma de Zacatecas, Mexico"
  13. AU="Hansen, Kristian Schultz"
  14. AU="Davenport, Bennett"

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  1. Buch ; Dissertation / Habilitation: Numerical studies of density downramp injection in laser plasma accelerators

    Jalas, Sören

    2014  

    Verfasserangabe vorgelegt von Sören Jalas
    Sprache Englisch
    Umfang 49 S., graph. Darst.
    Dokumenttyp Buch ; Dissertation / Habilitation
    Dissertation / Habilitation Univ., FB Physik, Bachelorarbeit--Hamburg, 2014
    Begleitmaterial 1 CD-ROM (12 cm)
    Datenquelle Ehemaliges Sondersammelgebiet Küsten- und Hochseefischerei

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  2. Artikel ; Online: Scalable spectral solver in Galilean coordinates for eliminating the numerical Cherenkov instability in particle-in-cell simulations of streaming plasmas.

    Kirchen, Manuel / Lehe, Remi / Jalas, Soeren / Shapoval, Olga / Vay, Jean-Luc / Maier, Andreas R

    Physical review. E

    2020  Band 102, Heft 1-1, Seite(n) 13202

    Abstract: Discretizing Maxwell's equations in Galilean (comoving) coordinates allows the derivation of a pseudospectral solver that eliminates the numerical Cherenkov instability for electromagnetic particle-in-cell simulations of relativistic plasmas flowing at a ...

    Abstract Discretizing Maxwell's equations in Galilean (comoving) coordinates allows the derivation of a pseudospectral solver that eliminates the numerical Cherenkov instability for electromagnetic particle-in-cell simulations of relativistic plasmas flowing at a uniform velocity. Here we generalize this solver by incorporating spatial derivatives of arbitrary order, thereby enabling efficient parallelization by domain decomposition. This allows scaling of the algorithm to many distributed compute units. We derive the numerical dispersion relation of the algorithm and present a comprehensive theoretical stability analysis. The method is applied to simulations of plasma acceleration in a Lorentz-boosted frame of reference.
    Sprache Englisch
    Erscheinungsdatum 2020-08-14
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 2844562-4
    ISSN 2470-0053 ; 2470-0045
    ISSN (online) 2470-0053
    ISSN 2470-0045
    DOI 10.1103/PhysRevE.102.013202
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel ; Online: Bayesian Optimization of a Laser-Plasma Accelerator.

    Jalas, Sören / Kirchen, Manuel / Messner, Philipp / Winkler, Paul / Hübner, Lars / Dirkwinkel, Julian / Schnepp, Matthias / Lehe, Remi / Maier, Andreas R

    Physical review letters

    2021  Band 126, Heft 10, Seite(n) 104801

    Abstract: Generating high-quality laser-plasma accelerated electron beams requires carefully balancing a plethora of physical effects and is therefore challenging-both conceptually and in experiments. Here, we use Bayesian optimization of key laser and plasma ... ...

    Abstract Generating high-quality laser-plasma accelerated electron beams requires carefully balancing a plethora of physical effects and is therefore challenging-both conceptually and in experiments. Here, we use Bayesian optimization of key laser and plasma parameters to flatten the longitudinal phase space of an ionization-injected electron bunch via optimal beam loading. We first study the concept with particle-in-cell simulations and then demonstrate it in experiments. Starting from an arbitrary set point, the plasma accelerator autonomously tunes the beam energy spread to the subpercent level at 254 MeV and 4.7  pC/MeV spectral density. Finally, we study a robust regime, which improves the stability of the laser-plasma accelerator and delivers sub-five-percent rms energy spread beams for 90% of all shots.
    Sprache Englisch
    Erscheinungsdatum 2021-03-30
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.126.104801
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  4. Artikel ; Online: Optimal Beam Loading in a Laser-Plasma Accelerator.

    Kirchen, Manuel / Jalas, Sören / Messner, Philipp / Winkler, Paul / Eichner, Timo / Hübner, Lars / Hülsenbusch, Thomas / Jeppe, Laurids / Parikh, Trupen / Schnepp, Matthias / Maier, Andreas R

    Physical review letters

    2021  Band 126, Heft 17, Seite(n) 174801

    Abstract: Applications of laser-plasma accelerators demand low energy spread beams and high-efficiency operation. Achieving both requires flattening the accelerating fields by controlled beam loading of the plasma wave. Here, we optimize the generation of an ... ...

    Abstract Applications of laser-plasma accelerators demand low energy spread beams and high-efficiency operation. Achieving both requires flattening the accelerating fields by controlled beam loading of the plasma wave. Here, we optimize the generation of an electron bunch via localized ionization injection, such that the combination of injected current profile and averaged acceleration dynamics results in optimal beam loading conditions. This enables the reproducible production of 1.2% rms energy spread bunches with 282 MeV and 44 pC at an estimated energy-transfer efficiency of ∼19%. We correlate shot-to-shot variations to reveal the phase space dynamics and train a neural network that predicts the beam quality as a function of the drive laser.
    Sprache Englisch
    Erscheinungsdatum 2021-05-14
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.126.174801
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  5. Artikel ; Online: Wavefront degradation of a 200 TW laser from heat-induced deformation of in-vacuum compressor gratings.

    Leroux, Vincent / Jolly, Spencer W / Schnepp, Matthias / Eichner, Timo / Jalas, Sören / Kirchen, Manuel / Messner, Philipp / Werle, Christian / Winkler, Paul / Maier, Andreas R

    Optics express

    2018  Band 26, Heft 10, Seite(n) 13061–13071

    Abstract: High-repetition-rate high-power laser systems induce a high average power heat deposition into the gold-coated diffraction gratings. To study the effects of the thermal expansion of in-vacuum Pyrex gratings on the laser properties, we scan the pulse ... ...

    Abstract High-repetition-rate high-power laser systems induce a high average power heat deposition into the gold-coated diffraction gratings. To study the effects of the thermal expansion of in-vacuum Pyrex gratings on the laser properties, we scan the pulse energy and repetition rate of a 200 TW laser system while monitoring the laser wavefront. Through the measured changes in laser divergence and focusability, we define an average power limit below which the in-vacuum compressor can be used with no degradation of the laser focus quality.
    Sprache Englisch
    Erscheinungsdatum 2018-05-14
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.26.013061
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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