Dresden 2017 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 1: New Accelerator Concepts I
AKBP 1.10: Vortrag
Montag, 20. März 2017, 17:30–17:45, MOL 213
Studying laser ion acceleration with overdense hydrogen ribbon targets by PIC code simulation — •João Branco1,2, Karl Zeil1, Lieselotte Obst1,2, Ulrich Schramm1,2, Thomas Kluge1, and Michael Bussmann1 — 1Helmholtz-Zentrum Dresden - Rossendorf, Dresden, Deutschland — 2Technische Universität Dresden, Dresden, Deutschland
We present simulation results on laser ion acceleration using hydrogen ribbon targets irradiated by ultra-intense, ultra-short laser pulses. These targets promise to produce pure proton beams applicable for cancer therapy at high repetition rates. We address critical issues concerning the acceleration process that potentially hinders the application of these beams in a clinical scenario.
For achieving proton energies suitable for the treatment of deep seated tumors it is important to increase the laser intensity. At high laser intensities, plasma instabilities both at the target surfaces and target bulk can create electron filaments which result in non-uniform proton beams, detrimental for delivering uniform dose distributions.
By varying the laser contrast it is possible to change the preplasma scale length to influence the formation of instabilities. Other means of controlling proton beams are either changing target geometry (e.g. going from planar ribbon targets to spherical droplet targets) or the polarization. We present results of 2D3V particle-in-cell simulations at realistic densities that show the influence on the plasma dynamics and final beam properties and discuss their relevance regarding applications of solid hydrogen targets for laser-driven proton tumor therapy.