Simulation study of CO2 laser-plasma interactions and self-modulated wakefield acceleration

Kumar, Prabhat; Samulyak, Roman; Yu, Kwangmin; Zgadzaj, Rafal; Amorim, Ligia Diana; Downer, M. C.; Welch, James; Litvinenko, Vladimir N.; Vafaei-Najafabadi, Navid

doi:10.1063/1.5095780

Simulation study of CO₂ laser-plasma interactions and self-modulated wakefield acceleration

Journal Article · Mon Jul 15 04:00:00 EDT 2019 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5095780· OSTI ID:1543396

Kumar, Prabhat ^[1]; Samulyak, Roman ^[2]; Yu, Kwangmin ^[3]; Zgadzaj, Rafal ^[4]; Amorim, Ligia Diana ^[1]; Downer, M. C. ^[4]; Welch, James ^[4]; Litvinenko, Vladimir N. ^[1]; Vafaei-Najafabadi, Navid ^[1]

Stony Brook Univ., Stony Brook, NY (United States)
Stony Brook Univ., Stony Brook, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of Texas at Austin, Austin, TX (United States)

3D numerical simulations of the interaction of a powerful CO₂ laser with hydrogen jets demonstrating the role of ionization on the characteristics of induced wakes are presented. Simulations using SPACE, a parallel relativistic Particle-in-Cell code, are performed in support of the plasma wakefield accelerator experiments being conducted at the Brookhaven National Laboratory (BNL) Accelerator Test Facility (ATF). A novelty of the SPACE code is its set of efficient atomic physics algorithms that compute ionization and recombination rates on the grid and transfer them to particles. The influence of ionization on the spectrum of pump laser has been studied for a range of gas densities.Simulations reproduce both Stokes and anti-Stokes shifts in the spectrum of pump laser, similar to those observed in experiments in the spectrum of probe. A good agreement has been achieved with the experiments on the effect of variation in gas density on Stokes/anti-Stokes intensity. In addition, self-injection and trapping of electrons into the self-modulated wakes has been observed and analyzed. Here, the experimentally validated code SPACE will be used for predictive simulations to guide future experiments at BNL ATF.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (SC-21)

Grant/Contract Number:: SC0012704

OSTI ID:: 1543396

Alternate ID(s):: OSTI ID: 1548580

Report Number(s):: BNL--211880-2019-JAAM

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 26; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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