### Conveners

#### WG6 - Theory and simulations

- Jean-Luc Vay (Berkeley Lab)
- Konstantin Lotov (Novosibirsk State University)

#### WG6 - Theory and simulations

- Konstantin Lotov (Novosibirsk State University)
- Jean-Luc Vay (Berkeley Lab)

#### WG6 - Theory and simulations

- Konstantin Lotov (Novosibirsk State University)
- Jean-Luc Vay (Berkeley Lab)

#### WG6 - Theory and simulations

- Konstantin Lotov (Novosibirsk State University)
- Jean-Luc Vay (Berkeley Lab)

Alberto Marocchino
(ROMA1)

9/16/15, 4:00 PM

WG6 - Theory and simulations

talk

We present a possible working point for the Sparc_Lab LNF facility that preserve bunch quality: witness is positioned and shaped so to preserve, over the entire acceleration length, both emittance and energy spread. This configuration is characterised by a 200pC driver and a 20pC follower witness. The one driver plus one witness is extended to a COMB (train of bunches) configuration: 3 drivers...

Mr
Francesco Massimo
(ROMA1)

9/16/15, 4:20 PM

WG6 - Theory and simulations

talk

Plasma Wakefield Acceleration (PWFA) needs efficient simulation tools to assess possible scenarios of experimental interest. While fluid models provide quick tools to understand the basic mechanisms, kinetic methods as the Particle in Cell (PIC)provide the most general and widely used self consistent tools to study the interaction between the injected beam and the plasma. Nonetheless, fully...

Dr
Arnaud Beck
(LLR - Ecole Polytechnique - CNRS/IN2P3)

9/16/15, 4:40 PM

WG6 - Theory and simulations

talk

SMILEI stands for Simulating Matter Irradiated by Light at Extreme Intensities. It is a new open source Particle In Cell (PIC) code, developed jointly by physicists and HPC experts in order to make sure that it performs well on the newest supercomputers architectures. State of the art algorithms are implemented and innovative ones are developed.
Recent simulation campaigns of laser...

Jean-Luc Vay
(Berkeley Lab)

9/16/15, 5:00 PM

WG6 - Theory and simulations

talk

Numerical simulations have been critical in the recent rapid developments of plasma-based acceleration concepts. Among the various available numerical techniques, the Particle-In-Cell (PIC) approach is the method of choice for self-consistent simulations from first principles. We report on several recent advances in PIC related algorithms that are of interest for application to plasma-based...

Anton Golovanov
(Lobachevsky State University of Nizhni Novgorod; Institute of Applied Physics RAS)

9/16/15, 6:00 PM

WG6 - Theory and simulations

talk

We develop an analytical model for beam loading in a bubble generated by a short laser pulse or a relativistic electron bunch in radially inhomogeneous plasma. The influence of a flat-top accelerated electron bunch on the bubble shape is described. The conversion efficiency from the fields of the bubble to the electrons is calculated and the optimal values of bunch charge and its position...

Mrs
Tahmina Akhter
(Dipartimento di Fisica, Università di Napoli Federico II, Napoli, Italy and INFN Sezione di Napoli, Napoli, Italy)

9/16/15, 6:20 PM

WG6 - Theory and simulations

talk

The self modulated dynamics of a relativistic charged particle beam is described within the theory of plasma wake field excitation, where the plasma is assumed to be magnetized, warm and collisional. A novel generalized Poisson-like equation for the wake potential is derived and coupled with the collisional Vlasov equation for the beam dynamics. The virial description and the stability...

Prof.
Konstantin Lotov
(Novosibirsk State University)

9/16/15, 6:40 PM

WG6 - Theory and simulations

talk

The self-modulation instability (SMI) is the key effect that makes possible the usage of presently available high-energy proton beams as drivers for plasma wakefield acceleration. The seeded SMI first transforms the long beam into a bunch train and then partly destroys these bunches. Both effects occur because of particle defocusing by the plasma wakefield. Development of the instability is...

Prof.
Robert Robson
(Griffith University, Australia)

9/17/15, 4:00 PM

WG6 - Theory and simulations

talk

This talk outlines a new theoretical procedure for modelling the transverse dynamics of relativistic electron beams injected into plasma-based accelerators operated in the blow-out regime. Quantities of physical interest, such as the emittance,are furnished directly from solution of phase space moment equations formed from the relativistic Vlasov equation. The moment equations are closed by an...

Prof.
Renato Fedele
(NA)

9/17/15, 4:20 PM

WG6 - Theory and simulations

talk

R. Fedele1,2, T. Akhter1,2, S. De Nicola3,2, M. Migliorati1,2, A. Marocchino4,5, F. Massimo,4,5, L. Palumbo4,5
1 Dipartimento di Fisica, Università di Napoli Federico II, Napoli, Italy
2 INFN Sezione di Napoli, Napoli, Italy
3 CNR-SPIN, Napoli, Italy
4 Dip. di Scienze di Base e Applicate per l’Ingegneria, Sapienza Università di Roma, Roma, Italy
5 INFN Sezione di Roma, Roma,...

Prof.
Sandor Varro
(Wigner Research Centre for Physics, Budapest, Hungary)

9/17/15, 4:40 PM

WG6 - Theory and simulations

talk

We analyse the new exact solutions [1-3] of the relativistic wave equations of a charged particle propagating in a plasmon wave of arbitrary high amplitude. The nonlinearities associated to these solutions depend on a new intensity parameter, which is the work done by the laser field along the plasmon wavelength divided by the laser photon energy. These solutions describe a high-contrast...

Ms
Olena Svystun
(National Science Center Kharkov Institute of Physics and Technology)

9/17/15, 6:00 PM

WG6 - Theory and simulations

talk

We present the results of fully relativistic electromagnetic PIC simulation, which was performed by a modified version of the UMKA2D3V-code. The laser pulse at a wavelength λ = 0.8 µm enters the computation region which is filled with uniform plasma from the left boundary and is incident normally on the plasma. The plasma density n0 = 1.8∙1019 cm-3. The longitudinal and transverse dimensions...

Daniele Palla
(PI)

9/17/15, 6:20 PM

WG6 - Theory and simulations

talk

In the original paper, Tajima and Dawson (1979), suggest to use a wakefield generated by an intense laser pulse to accelerate relativistic electron. In the Laser Wakefield Accelerators (LWFA), the high longitudinal electric field supported by plasma waves accelerates trapped (self-injected) electrons to velocities close to wave phase velocity. With respect to the standard RF-linacs, the...

Mr
Christopher Arran
(University of Oxford)

9/17/15, 6:40 PM

WG6 - Theory and simulations

talk

Laser wakefield acceleration (LWFA) has achieved many notable successes in recent years. However, the lasers used today have low wall-plug efficiency and pulse repetition rates typically limited to a few pulses per second. With these limitations LWFA would not meet the requirements of many applications such as next generation light sources with high average brightness and short pulses. In...

Thomas Kluge
(=)

9/17/15, 7:00 PM

WG6 - Theory and simulations

talk

The generation and propagation of strong currents of laser-accelerated hot electrons in solid density foils is of importance in many applications such as resistive heating, generation of resistive magnetic fields and ion acceleration. We present results from particle-in-cell simulations for the scaling of hot electron currents in solids and demonstrate the importance of a full description of...