12 May 2015 Undulator radiation driven by laser-wakefield accelerator electron beams
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The Advanced Laser-Plasma High-Energy Accelerators towards X-rays (ALPHA-X) programme is developing laserplasma accelerators for the production of ultra-short electron bunches with subsequent generation of coherent, bright, short-wavelength radiation pulses. The new Scottish Centre for the Application of Plasma-based Accelerators (SCAPA) will develop a wide range of applications utilising such light sources. Electron bunches can be propagated through a magnetic undulator with the aim of generating fully coherent free-electron laser (FEL) radiation in the ultra-violet and Xrays spectral ranges. Demonstration experiments producing spontaneous undulator radiation have been conducted at visible and extreme ultra-violet wavelengths but it is an on-going challenge to generate and maintain electron bunches of sufficient quality in order to stimulate FEL behaviour. In the ALPHA-X beam line experiments, a Ti:sapphire femtosecond laser system with peak power 20 TW has been used to generate electron bunches of energy 80-150 MeV in a 2 mm gas jet laser-plasma wakefield accelerator and these bunches have been transported through a 100 period planar undulator. High peak brilliance, narrow band spontaneous radiation pulses in the vacuum ultra-violet wavelength range have been generated. Analysis is provided with respect to the magnetic quadrupole beam transport system and subsequent effect on beam emittance and duration. Requirements for coherent spontaneous emission and FEL operation are presented.
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S. M. Wiggins, S. M. Wiggins, Maria Pia Anania, Maria Pia Anania, Gregor H. Welsh, Gregor H. Welsh, Enrico Brunetti, Enrico Brunetti, Silvia Cipiccia, Silvia Cipiccia, Peter A. Grant, Peter A. Grant, David Reboredo-Gil, David Reboredo-Gil, G. Manahan, G. Manahan, David W. Grant, David W. Grant, Dino A. Jaroszynski, Dino A. Jaroszynski, "Undulator radiation driven by laser-wakefield accelerator electron beams", Proc. SPIE 9509, Relativistic Plasma Waves and Particle Beams as Coherent and Incoherent Radiation Sources, 95090K (12 May 2015); doi: 10.1117/12.2178847; https://doi.org/10.1117/12.2178847

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