Göttingen 2025 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 4: AKBP Posters
AKBP 4.14: Poster
Dienstag, 1. April 2025, 16:30–18:00, ZHG Foyer 1. OG
Self- and pre-ionized electron-driven wakefields in mixed gases at SLAC FACET-II — •Edgar Hartmann1, Ahmad Fahim Habib2, 3, Mirela Cerchez1, Marc Osenberg1, Thomas Heinemann1, Andrew Sutherland1, Alexander Knetsch4, and Bernhard Hidding1, 2, 3 — 1Institute for Laser- and Plasmaphysics, Heinrich Heine University, Düsseldorf — 2University of Strathclyde, Glasgow, UK — 3The Cockcroft Institute, Warrington, UK — 4SLAC National Accelerator Laboratory, Menlo Park, California, USA
We present experimental results from the Facility for Advanced Accelerator Experimental Tests II (FACET-II) at SLAC National Accelerator Laboratory, marking the first exploratory experiments of the E310: Trojan Horse-II program. This work focuses on advancing a novel mechanism for generating high-brightness witness beams in electron beam-driven plasma wakefield accelerators. The mechanism, known as Trojan Horse injection, relies on selective ionization of a low-ionization-threshold (LIT) and high-ionization threshold (HIT) species, such as hydrogen and the first ionization level of helium. In this process, the LIT species provides the plasma sustaining the wakefield accelerator and is ionized either by the electron beam itself or by a pre-ionizing laser pulse. A secondary injector laser pulse ionizes the HIT species only within a small, defined region directly within the wakefield. The preliminary experiments investigated the ionization capabilities of the 10 GeV electron driver in a gas mixture. Selective ionization of only the LIT species is critical for enabling Trojan Horse injection.
Keywords: plasma wakefield acceleration; Trojan Horse injection; electron beam self-ionization; pre-ionized wakefields