Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 24: Laser Plasmas II
P 24.4: Vortrag
Donnerstag, 8. März 2018, 11:30–11:45, KI 1.174
Ion wave breaking acceleration in laser-driven near-critical relativistically transparent plasma — •Bin Liu1, Jürgen Meyer-ter-Vehn2, and Hartmut Ruhl1 — 1Institute for Computational and Plasma Physics, Ludwig-Maximilian-Universität, München, 80333 München, Germany — 2Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
A major direction of effort in laser-driven plasma-based ion acceleration is to produce high-energy high-quality ion beams in a controllable and robust way. Here, with the help of theoretical analysis and simulations, we show that ion wave breaking acceleration is promising for this purpose. When propagating an ultra-intense (>1020W/cm2) laser pulse in near-critical relativistically transparent plasma, a comoving cold ion wave is produced as a response to laser-driven charge-separation field. When driven strongly, the ion wave breaks, such that background ions are self-trapped and accelerated to high energy [1]. This regime has not been studied in sufficient detail, so far. The most interesting point is that the trapping process is self-regulating and self-stops when only a fraction of ions is trapped. The trapping dose can be controlled by external parameters such as laser intensity and target density. It allows to design ion pulses with low energy spread and beam emittance. Furthermore, when an ion wave breaks, a singularity of ion-fluid-Poisson equations appears. The singular behaviour in the vicinity of the wave breaking point is characterised by a set of power-law exponents, and makes the ion trapping process robust. Reference: [1] B. Liu, et.al., Phys. Rev. Accel. Beams 19, 073401 (2016).