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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 4: New Accelerator Concepts

AKBP 4.1: Vortrag

Montag, 16. März 2020, 16:30–16:45, GÖR 226

Polarized Particle Beams from Laser-Plasma Accelerators — •Anna Hützen^1,2, Johannes Thomas², Andreas Lehrach^3,4, T. Peter Rakitzis^5,6, Alexander Pukhov², Liangliang Li^7,8, Yitong Wu^7,8, Ralf Engels⁴, and Markus Büscher^1,2 — ¹PGI-6, FZJ — ²HHU Düsseldorf — ³JARA-FAME — ⁴IKP, FZJ — ⁵University of Crete, Greece — ⁶FORTH, Greece — ⁷SIOM, China — ⁸CAS, China

The generation of polarized particle beams still relies on conventional particle accelerators which are typically very large in scale and budget. Thus, concepts based on laser-driven wakefield acceleration have strongly been promoted during the last decades. Despite many advances in the understanding of fundamental physical phenomena, one largely unexplored issue is how highly polarized beams can be produced. The realization of laser-plasma based accelerators for polarized beams is now being pursued as a joint effort of groups from Germany (FZJ, RWTH, HHU), Greece, and China within the ATHENA consortium. As a first step, we have theoretically investigated and identified the mechanisms that influence the beam polarization in laser-plasma accelerators. We then carried out a set of Particle-in-cell simulations on the acceleration of electrons and proton beams from gaseous and foil targets showing the generation of intense polarized beams if pre-polarized gas targets of high density are employed. Such polarized sources for electrons, protons, deuterons and 3He ions are now being built at FZJ. Proof-of-principle measurements at the (multi-)PW laser facilities PHELIX (GSI) and SULF (Shanghai) are in preparation.