VSR Seminar: Kinetic simulation of tokamak breakdown and laser-driven particle & radiation sources
Conferencing tool Zoom: https://us02web.zoom.us/j/81663973451?pwd=bWFoNDgzMERXYkx4K0YrbFc0N3llQT09
Meeting ID: 816 6397 3451
Passcode: 3kYxwU
Speaker: Prof. Paul Gibbon, Jülich Supercomputing Centre, Forschungszentrum Jülich, Germany
Recent work is presented on two quite distinct areas of kinetic plasma modelling. First, the plasma creation process itself, an ionization-induced 'avalanche' is considered using a first-principles approach based on our mesh-free electrostatic tree algorithm (PEPC). Benchmarking of this model has been made for the well-known Townsend avalanche [1] and first results for ITER-sized toroidal vessels will be presented. The second part of the talk will focus on modelling of laser-based particle and radiation sources of relevance to the freshly inaugurated JuSPARC facility at FZJ. Recently published work using the open-source particle-in-cell code EPOCH will be shown, including betatron [2] and high-harmonic radiation [3] sources, as well as a new scheme for producing polarized proton beams at GeV energies [4].
1. Chew, J., Gibbon P., Brömmel D., Wauters T., Gribov Y. and de Vries P.C., Three-dimensional first principles simulation of a hydrogen discharge, Plasma Physics and Controlled Fusion 63, 045012 (2021), DOI: 10.1088/1361-6587/abdd75
2. Chitgar, Z. M., Gibbon, P., Böker, J., Lehrach A. and Büscher, M., Electron self-injection threshold for the tandem-pulse laser wakefield accelerator, Physics of Plasmas 27, 023106, (2020), DOI: 10.1063/1.5117503
3. Chitgar, Z. M., Adam, R., Greb, C., Lehrach, A., Büscher, M. and Gibbon, P., Theory of circularly polarized harmonic generation using bi-color lasers in underdense plasmas, Plasma Physics and Controlled Fusion 63, 035023 (2021), DOI 10.1088/1361-6587/abd9e1
4. X. F. Li, P. Gibbon, A. Hützen, M. Büscher, S. M. Wenig, M. Chen and Z. M. Sheng, Polarized proton acceleration in ultraintense laser interaction with near-critical-density plasmas, Physical Review E 104, 015216 (2021), DOI: 10.1103/PhysRevE.104.015216