Generation of laser pulse trains for tests of multi-pulse laser wakefield acceleration
Nuclear Instruments and Methods in Physics Research A Elsevier 829 (2016) 383-385
Abstract:
In multi-pulse laser wakefield acceleration (MP-LWFA) a plasma wave is driven by a train of low-energy laser pulses separated by the plasma period, an approach which offers a route to driving plasma accelerators with high efficiency and at high pulse repetition rates using emerging technologies such as fibre and thin-disk lasers. Whilst these laser technologies are in development, proof-of-principle tests of MP-LWFA require a pulse train to be generated from a single, high-energy ultrafast pulse. Here we demonstrate the generation of trains of up to 7 pulses with pulse separations in the range 150–170 fs from single 40 fs pulses produced by a Ti:sapphire laser.A novel approach in one-dimensional phase retrival problem and its application to the time profile recon-struction
IPAC 2016 - Proceedings of the 7th International Particle Accelerator Conference (2016) 955-957
Abstract:
Phase retrieval problem occurs in a number of areas in physics and is the subject of continuing investigation [1-15]. One dimensional case, for example, an electron bunch temporal profile reconstruction, is particularly challenging. Frequently applied methods, are reliable if the Blaschke phase [10-12] contribution is negligible. This, however, is neither known a priori nor can it be assumed for an arbitrary profile. In this work we present a novel algorithm with additional constraints which gives reproducible, stable solutions for profiles, both artificial and experimental, otherwise unresolved by existing techniques.Temporal evolution of longitudinal bunch profile in a laser wakefield accelerator
Physical Review Special Topics: Accelerators and Beams American Physical Society 18:12 (2015)
Abstract:
© 2015 authors. Published by the American Physical Society. We present single-shot measurements of the longitudinal bunch profile from a laser-wakefield accelerator with sub-fs resolution, based on detection of coherent transition radiation in a broad spectral range. A previously developed phase retrieval algorithm enables reconstruction of the bunch profile without prior assumptions about its shape. In this study, a variable-length gas target is used to explore the dynamics of bunch evolution. Our results show that once the laser energy is depleted the time structure of the generated electron beam changes from a single bunch to a double bunch structure, well suited for driver-witness type experiments.Multi-pulse laser wakefield acceleration: a new route to efficient, high-repetition-rate plasma accelerators and high flux radiation sources
Journal of Physics B Atomic Molecular and Optical Physics IOP Publishing 47:23 (2014) 234003
Special issue on compact x-ray sources
Journal of Physics B Atomic Molecular and Optical Physics IOP Publishing 47:23 (2014) 230301