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Proceedings Paper

Soft pair showers in the collision of gamma rays with laser pulses: role of pulse energy versus intensity (Conference Presentation)
Author(s): Caterina Riconda; Fabien Niel; M. Grech; François Amiranoff; Mathieu Lobet

Paper Abstract

We report recent results on the study of pair production by nonlinear Breit-Wheeler process in the collision of a high energy photon beam with a counter-propagating laser beam. This configuration has been used in particular in the pioneering Burke experiment [Burke et al., 1997], and all the energy of the produced particles comes from the initial energy of the beam : hence the name showers. For a fixed laser energy amount we study the optimal situation, and show that the total production rate increases more quickly with the effective surface than the decrease of the production rate with the peak intensity, if we are above treshold for the quantum parameter (>>1). We consider both Gaussian fields and Laguerre-Gauss beams with parameters l = 1- 4, carring orbital angular momentum (OAM). 3D Particle-In-Cell (PIC) simulations are performed with the opensource PIC code SMILEI [Derouillat et al., CPC (2008)]. Our study show the counterintutive result that increasing peak intensity can result in decreasing the pair production, and suggest that in this configuration the extra complexity of introducing AOM beams is not justified if the focus is on pair creation.

Paper Details

Date Published: 14 May 2019
Proc. SPIE 11039, Research Using Extreme Light: Entering New Frontiers with Petawatt-Class Lasers IV, 110390X (14 May 2019); doi: 10.1117/12.2525515
Show Author Affiliations
Caterina Riconda, Sorbonne Univ. (France)
Fabien Niel, Ecole Polytechnique (France)
M. Grech, Ecole Polytechnique (France)
François Amiranoff, Lab. pour l'Utilisation des Lasers Intenses (France)
Mathieu Lobet, Ecole Polytechnique (France)

Published in SPIE Proceedings Vol. 11039:
Research Using Extreme Light: Entering New Frontiers with Petawatt-Class Lasers IV
Georg Korn; Luis O. Silva, Editor(s)

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