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Title	Laser-Plasma Acceleration Modeling Approach in the Case of ESCULAP Project.
Authors	V. Kubytskyi, C. Bruni, K. Cassou, V. Chaumat, N. Delerue, D. Douillet, S. Jenzer, H. Purwar, K. Wang LAL, Orsay, France E. Baynar, M. Pittman CLUPS, Orsay, France J. Demailly, O. Guilbaud, S. Kazamias, B. Lucas, G. Maynard, O. Neveu, D. Ros CNRS LPGP Univ Paris Sud, Orsay, France D. Garzella CEA-IRFU, Gif-sur-Yvette, France R. Prazeres CLIO/ELISE/LCP, Orsay, France
Abstract	Objective of ESCULAP project is the experimental study of Laser-Plasma Acceleration (LPA) of relativistic electron bunch from photo-injector in 10 cm length plasma cell *. In parallel, numerical tools have been developed in order to optimize the setup configuration and the analysis of the expected results. The most important issue when dealing with numerical simulation over such large interaction distances is to obtain a good accuracy at a limited computing cost in order to be able to perform parametric studies. Reduction of the computational cost can be obtained either by using state-of-the-art numerical technics and/or by introducing adapted approximation in the physical model. Concerning LPA, the relevant Maxwell-Vlasov equations can be numerically solved by Particle-In-Cell (PIC) methods without any additional approximation, but can be very computationally expensive. On the other hand, the quasi-static approximation ***, which yields a drastic reduction of the computational cost, appears to be well adapted to the LPA regime. In this paper we present a detailed comparison of the performance, in terms of CPU, of LPA calculations and of the accuracies of their results obtained either with a highly optimized PIC code (FBPIC **) or with the well known quasi-static code WAKE ***. We first show that, when considering a sufficiently low charge bunch for which the beam loading effect can be neglected, the quasi-static approximation is fully validated in the LPA regime. The case of a higher bunch charge, with significant beam loading effects, has also been investigated using an enhanced version of WAKE, named WAKE-EP. Additionally, a cost evaluation, in terms of used energy per calculation, has also been done using the multi-CPU and multi-GPU versions of FBPIC.
Footnotes & References	* E. Baynard et al, Nucl. Instrum. Meth. Phys. Res. A 909, 46 (2018) ** R.Lehe et al., Comp. Phys. Com. 203, 66 (2016) *** P. Mora & A, Jr Th. Antonsen, Phys. of Plasmas 4, 217 (1997)
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Conference	IPAC2019
Series	International Particle Accelerator Conference (10th)
Location	Melbourne, Australia
Date	19-24 May 2019
Publisher	JACoW Publishing, Geneva, Switzerland
Editorial Board	Mark Boland (UoM, Saskatoon, SK, Canada); Hitoshi Tanaka (KEK, Tsukuba, Japan); David Button (ANSTO, Kirrawee, NSW, Australia); Rohan Dowd (ANSTO, Kirrawee, NSW, Australia); Volker RW Schaa (GSI, Darmstadt, Germany); Eugene Tan (ANSTO, Kirrawee, NSW, Australia)
Online ISBN	978-3-95450-208-0
Received	14 May 2019
Accepted	22 May 2019
Issue Date	21 June 2019
DOI	doi:10.18429/JACoW-IPAC2019-THPGW059
Pages	3723-3725
Copyright	Published by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.