31 July 2016 to 5 August 2016
Gaylord Hotel and Conference Center
US/Eastern timezone

Comparison of Quasi-3D and Full-3D OSIRIS simulations of ionization and density downramp injection

2 Aug 2016, 10:30
20m
Baltimore 2 (Gaylord Hotel)

Baltimore 2

Gaylord Hotel

Oral Working Group 2 WG2

Speaker

Mr. Thamine Dalichaouch (UCLA)

Abstract

Ionization injection has recently been proposed and demonstrated as a controllable injection scheme for creating high quality relativistic electron beams using LWFA. Using a particle-in-cell description in $r-z$ and a Fourier expansion in $\phi$, we have implemented an algorithm to study Ionization Injection using the Ammosov-Delone-Krainov (ADK) tunneling ionization model. We present preliminary results of ionization and down-ramp triggered injection and compare the results against Full-3D LWFA simulations.

Summary

In the past few decades, Laser wakefield acceleration (LWFA) has generated a lot of interest in compact particle accelerator and free-electron-laser (FEL) applications due to its much higher accelerating fields compared to those of conventional accelerators. Recently, ionization injection and density downramp injection have been proposed and demonstrated as a controllable injection scheme for creating higher quality relativistic electron beams using LWFA. However, full-3D simulations of plasma-based accelerators are computationally intensive, sometimes taking millions of core-hours on today’s computers. A more efficient quasi-3D algorithm was developed and implemented into OSIRIS using a particle-in-cell description with a charge conserving current deposition scheme in $r-z$ and a gridless Fourier expansion in $\phi$ to simulate the physics of LWFA. Due to the azimuthal symmetry in LWFA, quasi-3D simulations are computationally more efficient than Full-3D simulations since only the first few harmonics are needed to capture the physics of LWFA. Using the quasi-3D approach, we have implemented an algorithm to study Ionization Injection using the Ammosov-Delone-Krainov (ADK) tunneling ionization model. We use the code to present preliminary results of ionization and down ramp triggered injection and compare the results against Full-3D LWFA simulations.

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Primary author

Co-authors

Dr. Asher Davidson (UCLA) Dr. Chaojie Zhang (Tsinghua University) Mr. Fei Li (University of California, Los Angeles) Dr. Jorge Vieira (IST, Portugal) Dr. Peicheng Yu (UCLA) Prof. Ricardo Fonseca (IST, Portugal) Prof. Warren Mori (UCLA) Dr. Wei Lu (Tsinghua) Dr. Xinlu Xu (University of California, Los Angeles)

Presentation Materials

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