SMuK 2021 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 8: Laser Plasmas I
P 8.2: Vortrag
Mittwoch, 1. September 2021, 14:30–14:45, H5
Spin-polarized particle beams from laser-plasma based accelerators — •Lars Reichwein1, Anna Hützen2,3, Markus Büscher2,3, and Alexander Pukhov1 — 1Institut für Theoretische Physik I, Heinrich Heine Universität Düsseldorf, Germany — 2Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich, Germany — 3Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf, Germany
Spin-polarized particles with high energies are needed for various experiments, i.a. to examine the structure of protons and neutrons for further insight of QCD or to probe the nuclear spin structure. A promising option is the acceleration of pre-polarized particles from a plasma using a high-intensity laser [1]. We give a brief overview of the state-of-the-art for this subject, for which proof-of-principle experiments are currently being prepared. Further, we will present the acceleration of protons via magnetic vortex acceleration (MVA) in more detail and discuss the effects of density down-ramps on the proton yield studied by means of particle-in-cell simulations [2]. We show that the beam's average spin polarization remains robust against moderate changes of the down-ramp length and is only affected by changes in the collimation process for a significant increase in length.
[1] M. Büscher et al., doi:10.1017/hpl.2020.35, High Power Laser Sci (2020)
[2] L. Reichwein et al., doi:10.1088/1361-6587/ac0614, Plasma Phys. Control. Fusion (2021)