Comparison of self-injection thresholds in He and N-2 and role of self-focusing in LWFA

Year: 2016

Authors: Palla D., Baffigi F., Brandi F., Fulgentini L., Koester P., Labate L., Londrillo P., Gizzi LA

Autors Affiliation: Intenser Laser Irradiation Laboratory, INO-CNR, Via Moruzzi, 1 56124 Pisa, Italy
INFN, Sez. Pisa, Largo B. Pontecorvo, 3 – 56127 Pisa, Italy
Istituto Italiano di Tecnologia, Nanophysics Department, via Morego 30, 16163 Genova, Italy
Universitá di Bologna e Sez. INFN, Bologna, Italy

Abstract: We present an experimental study of laser-plasma acceleration in which the injected charge was measured at self-injection threshold for He and N-2. We use numerical particle-in-cell simulation to unfold the role of ionization in the self-injection process and to reconstruct the local electrons density from the atomic density and the ionization degree. Comparison of measured and calculated self-injection thresholds yields the dependence of injected charge upon the electron density and sheds light on the possible role of the picosecond pedestal of femtosecond laser pulses in setting the initial charge state of the plasma. (C) 2016 Elsevier B.V. All rights reserved.

Journal/Review: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT

Volume: 829      Pages from: 408  to: 412

More Information: Conference: 2nd Workshop on European Advanced Accelerator Concepts (EAAC) – INFN, ITALY
DOI: 10.1016/j.nima.2016.03.109
KeyWords: Self injection, Ionization, LWFA, Self focusing
DOI: 10.1016/j.nima.2016.03.109

Citations: 5
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