%0 Report
%A Chen, Ye Lining
%A Jao, Chun-Sung
%T An Improved Electron Beam Dynamics Design for Laboratory Plasma-Astrophysical Studies: a Technical Note
%N arXiv:1911.00135
%M PUBDB-2019-04783
%M arXiv:1911.00135
%P 8
%D 2019
%Z  
%X A technical note is given regarding our previous laboratory plasma-astrophysical studies [C.-S. Jao et al., High Energy Density Physics 32, 31-43 (2019) and Y. Chen et al., Nucl. Instrum. Methods Phys. Res., Sect. A 903, 119 (2018)]. In this note, an upgraded accelerator beamline design is proposed based on a feasible experimental setup in a realistic laboratory environment. The improved design aims to provide milliampere (mA) mega-electron-volt (MeV) quasi-continuous (cw) electron beams for plasma-astrophysical applications. Such a design utilizes a so-called mixed-guiding-field magnetic system right after the cut disk structure (CDS) booster cavity to provide a periodic longitudinal focusing field. The transportation of the produced cw beam with large energy spread to the plasma cell location is improved. The magnetic field serves as well as a seeding field in the plasma environment for the growth of electromagnetic instabilities. In conjunction with the appliance of a circular collimator at the exit of the CDS, the new design allows production of quasi-cw beams with a three orders higher number density at the entrance of the plasma cell compared to the previous design for a seeding magnetic field of about 50 mT while the locally enhanced electric field at the cathode is up to 8 GV/m. The associated beam dynamics simulation results are presented. As proof of principle studies, the produced electron beams are applied in nonlinear plasma-astrophysical simulations for exploring the growth of the instabilities. The extracted parameters and/or distributions from the generated electron beams in the laboratory environment are used in these particle-in-cell simulations. The obtained results are presented and discussed.
%F PUB:(DE-HGF)29
%9 Report
%R 10.3204/PUBDB-2019-04783
%U https://bib-pubdb1.desy.de/record/429036