Sep 15 – 21, 2019
Hotel Hermitage, La Biodola Bay, Isola d'Elba, Italy
Europe/Rome timezone

Narrow energy spread, GeV electron beams from shock injection in a laser wakefield accelerator

Sep 18, 2019, 6:40 PM
SML (Hotel Hermitage)


Hotel Hermitage

talk WG1 - Electron beams from plasmas WG1 - Injection control


Matthew Streeter (Imperial College London)


Laser wakefield accelerators (LWFAs) using self- or ionisation-injection techniques have been demonstrated to produce GeV electron beams, but typically suffer from large energy spreads when operating in this regime. One promising alternative scheme is shock injection, where abrupt changes in the local density of a LWFA gas target can induce the injection of electrons into the wakefield. This technique has been shown to produce few-$\%$ energy spread, sub-GeV beams, at values of $a_0$ close to unity.

We present results on shock injection using the Gemini laser ($a_0 = 2.5$), producing $\Delta E_{\rm{FWHM}} / E \lt \sim 5 \%$ electron beams at $> 1$ GeV. Low energy spread electron bunches are a vital tool in precision radiation-reaction studies, where the distinction between competing semi-classical and fully-stochastic QED models is highly sensitive to initial bunch energy spread. Additionally these compact, low emittance electron beams could eventually provide sources for Thomson scattering, sources for free electron lasers or part of a staged acceleration scheme to reach multi-GeV electron energies.

Primary author


Elias Gerstmayr (Imperial College London) Matthew Streeter (Imperial College London) Brendan Kettle (Imperial College London) Christopher Underwood (University of York) Mr Jason Cardarelli (University of Michigan) Ms Eva Los (Imperial College London) Mr Dominik Hollatz (Helmholtz Institute Jena) Mario Balcazar Munoz-Reyes (University of Michigan) Robbie Watt (Imperial College London) Aaron Alejo (Queen's University of Belfast) Christopher Arran (University of York) Mr Christopher Baird (University of York) Dr Tom Blackburn (Chalmers University of Technology) Dr Nicolas Bourgeois (Central Laser Facility (CLF)) Jason Cole (Imperial College London) Mr Harsh Harsh (University Jena) Prof. Mattias Marklund (Chalmers University of Technology) Mr Guillermo Marrero Samarin (Queen's University Belfast) Dr Christopher Ridgers (University of York) Dr Christian Roedel (Helmholtz Institut Jena) Mr Felipe Salgado (University Jena) Gianluca Sarri (Queen's University Belfast) Daniel Symes (Rutherford Appleton Laboratory) Chris Murphy (York University) Dr Alec Thomas (University of Michigan) Prof. Matthew Zepf (Helmholtz Institute Jena) Stuart Mangles (Imperial College London)

Presentation materials