Growth rate and gain of stimulated Brillouin scattering considering nonlinear Landau damping due to particle trapping

Plasma Physics and Controlled Fusion IOP Publishing 62:4 (2020) 045013

Authors:

QS Feng, LH Cao, ZJ Liu, L Hao, CY Zheng, C Ning, XT He

Stimulated Brillouin scattering of backward stimulated Raman scattering

Scientific Reports Springer Nature 10:1 (2020) 3492

Authors:

Qingsong FENG, Lihua Cao, Zhanjun Liu, Chunyang Zheng, Xiantu He

Wakefields in a cluster plasma

Physical Review Special Topics: Accelerators and Beams American Physical Society 22:11 (2019) 113501

Authors:

M Mayr, L Ceurvorst, M Kasim, J Sadler, B Spiers, K Glize, A Savin, N Bourgeois, F Keeble, A Ross, D Symes, R Aboushelbaya, R Fonseca, J Holloway, N Ratan, R Trines, R Wang, R Bingham, P Burrows, M Wing, R Pattathil, Peter Norreys

Abstract:

We report the first comprehensive study of large amplitude Langmuir waves in a plasma of nanometer-scale clusters. Using an oblique angle single-shot frequency domain holography diagnostic, the shape of these wakefields is captured for the first time. The wavefronts are observed to curve backwards, in contrast to the forwards curvature of wakefields in uniform plasma. Due to the expansion of the clusters, the first wakefield period is longer than those trailing it. The features of the data are well described by fully relativistic two-dimensional particle-in-cell simulations and by a quasianalytic solution for a one-dimensional, nonlinear wakefield in a cluster plasma.

Orbital angular momentum coupling in elastic photon-photon scattering

Physical Review Letters American Physical Society 123:11 (2019) 113604

Authors:

R Aboushelbaya, K Glize, A Savin, M Mayr, B Spiers, R Wang, J Collier, M Marklund, R Trines, R Bingham, Peter Norreys

Abstract:

In this Letter, we investigate the effect of orbital angular momentum (OAM) on elastic photon-photon scattering in a vacuum for the first time. We define exact solutions to the vacuum electromagnetic wave equation which carry OAM. Using those, the expected coupling between three initial waves is derived in the framework of an effective field theory based on the Euler-Heisenberg Lagrangian and shows that OAM adds a signature to the generated photons thereby greatly improving the signal-to-noise ratio. This forms the basis for a proposed high-power laser experiment utilizing quantum optics techniques to filter the generated photons based on their OAM state.

Auto-resonant stimulated Brillouin backscattering in supersonic flowing plasmas by fully kinetic Vlasov simulations

Plasma Physics and Controlled Fusion IOP Publishing 61:8 (2019) 085017

Authors:

Q Wang, CY Zheng, ZJ Liu, LH Cao, CZ Xiao, QS Feng, CS Liu, XT He