Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session YM09: Mini-Conference: Relativistic Plasma Physics in Supercritical Fields IIILive Streamed
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Chair: Alec Thomas, UM Room: 206 AB |
Friday, October 21, 2022 9:30AM - 9:48AM |
YM09.00001: Radiation reaction cooling as a progenitor of kinetic instabilities and coherent radiation Pablo J Bilbao, Luis O Silva The trajectories of relativistic particles in strong electromagnetic fields are modified by the backreaction of their own emitted radiation [1]. We examine how this modification to individual particle dynamics affects the global plasma dynamics in momentum space. Our analytical model is based on the extension of the Vlasov equation to include the Landau-Lifshitz radiation reaction force. Initially stable momentum distributions, under the right EM field conditions, evolve into kinetically unstable distributions [2,3]. This is shown for particle beams undergoing radiation cooling under different field configurations [4]. Particle-in-cell simulations, performed with OSIRIS [5,6], are employed to corroborate the theoretical models. |
Friday, October 21, 2022 9:48AM - 10:06AM |
YM09.00002: Bright Gamma-Ray Flash in the Lambda-Cube Regime Prokopis Hadjisolomou, Tae Moon Jeong, Petr Valenta, David Kolenaty, Roberto Versaci, Veronika Olšovcová, Christopher P Ridgers, S.V. Bulanov The availability of multi-petawatt lasers offers in principle new possibilities on investigating various effects [Nakamura 2012, Ridgers 2012, Lezhnin 2018], including γ-photon and e+-e- pair generation. Approximately two decades ago the λ3 regime was envisioned [Mourou 2002], where a single-cycle laser pulse is focused to the diffraction limit level. In [Hadjisolomou 2021, Hadjisolomou 2022] we develop a computational method where a near-single-cycle laser pulse is focused to a spherical-like volume of sub-wavelength diameter, and then bonded into particle-in-cell (PIC) simulations. In the simulations the laser interacted with a mass-limited foil, where a multi-parametric scan of the interaction includes the foil thickness and electron density. Other variables are the laser power and polarisation, revealing that for γ-photon generation in the λ3 regime, the radial laser polarisation is optimal. As a final step, the results from our PIC simulations are used in Monte-Carlo simulations [Kolenaty2022], where the interaction of laser-generated particles with high-Z targets used as a secondary target is revealed. The Monte-Carlo simulations show further e+-e- pair generation, along with generation of unstable nuclei originating from photonuclear interactions. |
Friday, October 21, 2022 10:06AM - 10:24AM |
YM09.00003: Efficient generation of γ-photon from solid target irradiated by high-power laser pulses and pair production through the nonlinear Breit-Wheeler process Tae Moon Jeong, Prokopis Hadjisolomou, Alexander J Macleod, Sergei V Bulanov The efficient generation of γ-photons from a solid target irradiated by 1-100 PW laser pulses was proposed through QED particle-in-cell simulations [1-3]. The electron-positron (ep) pair creation and the radioactive nuclei production in the secondary high-Z material irradiated by the γ-photons produced have been studied in [4]. Another interesting application of those γ-photons is to collide them with a focused high-power laser pulse for the nonlinear Breit-Wheeler pair creation. A single high-power laser beam can be split into two, so one beam is to generate γ-photons from a solid target and the other to collide with the γ-photons for the ep pair creation. In this talk, theoretical estimation on the generation of γ-photons from a solid target and the ep pair production will be presented. |
Friday, October 21, 2022 10:24AM - 10:42AM |
YM09.00004: Spin-dependent quantum radiation reaction: On the dynamics of spinning radiating particles Daniel Seipt, Alec G.R. Thomas In this talk I will discuss several aspects of the interplay between radiation reaction effects and the spin polarization effects for particles interacting with supercritical electromagnetic fields. Boltzmann-Vlasov-type transport equations are formulated in order to incorporate the spin degree of freedom of the charged leptons, where the spin-dependent photon emission processes in ultra-intense fields are modelled via spin-dependent collision operators. The equations for spin-polarized radiation reaction are derived by calculating the moments of the spin-polarized kinetic equations. We find the conditions under which the Sokolov-Ternov theory is applicable, and identify corrections to it. A spin-dependent Gaunt factor for a phenomenological description of spin-dependent radiation reaction effects is derived from first principles. Moreover, the relation of the kinetic description to the single-particle BMT-equation will be elaborated. |
Friday, October 21, 2022 10:42AM - 11:00AM |
YM09.00005: Helicity transfer associated with electron g-factor in ultraintense laser fields Yan-Fei Li, Yue-Yue Chen, Karen Z Hatsagortsyan, Christoph H Keitel The development of modern ultraintense laser facilities brings about new possibilities for testing predictions of strong-field quantum electrodynamics (QED) theory. We have investigated electron beam longitudinal polarization during the interaction with counterpropagating circularly polarized ultraintense laser pulses, while accounting for the anomalous magnetic moment of the electron. Although it is known that the helicity transfer from the laser photons to the electron beam is suppressed in linear and nonlinear Compton scattering processes, we show that the helicity transfer nevertheless can happen via an intermediate step of the electron radiative transverse polarization, phase matched with the driving field, followed up by spin rotation into the longitudinal direction as induced by the anomalous magnetic moment of the electron. With spin-resolved QED Monte Carlo simulations, we demonstrate the consequent helicity transfer from laser photons to the electron beam with a degree up to 10%, along with an electron radial polarization up to 65% after multiple photon emissions in a femtosecond timescale. This signature is robust with respect to the laser and electron parameters and measurable with currently available experimental technology. It could serve for testing QED predictions on radiative corrections. |
Friday, October 21, 2022 11:00AM - 11:18AM |
YM09.00006: Spin and polarization-dependent Osiris QED module for the future strong field QED laser-plasma experiment Qian Qian, Daniel Seipt, Marija Vranic, Thomas E Grismayer, Tom G Blackburn, Christopher P Ridgers, Alexander G Thomas With the rapid development of high-power petawatt class lasers worldwide, exploring the physics in the strong field QED regime will become one of the frontiers for laser-plasma interaction research. Here, we present the development of a full spin and polarization-included QED module based on the particle-in-cell code OSIRIS. In this module, the dynamics of the lepton's spin involve both the classical spin precession process described by the classical T-BMT equation and the quantum radiation reaction-induced spin transition process. The photon polarization-resolved quantum radiation rate allows us to assign the polarization state for each generated photon in the simulation. We also consider the influence of the lepton spin and photon polarization on the Non-linear Breit-Wheeler pair production process calculation. Compared with state-of-the-art, most common spin/polarization averaged QED modules, this full spin/polarization distinguished quantum module is able to more accurately simulate multi-staged processes like avalanche and shower type electron-positron pair production cascade processes. We also use this module to explore possible routines for generating polarized gamma-ray and lepton bunch through laser-plasma interaction. |
Friday, October 21, 2022 11:18AM - 11:36AM Author not Attending |
YM09.00007: Vacuum Pair Production Experiments Matt Zepf
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Friday, October 21, 2022 11:36AM - 11:54AM |
YM09.00008: Towards a direct, precision measurement of the quantum vacuum Lagrangian coupling coefficients with super-intense counterpropagating pulses Wendell T Hill, Luis Roso, Roberto L Matellanes, Smrithan Ravichandran, Andrew M Longman, Calvin Z He, Jose-Antonio Perez-Hernandez, Jon I Apiñaniz Aginako, Lucas D Smith, Robert Fedosejevs A possible experimental scenario for direct, precision measurement of the two coupling coefficients of the QED Lagrangian via photon-photon scattering will be presented. Such a measurement, which would not depend on the quantum vacuum (qvac) being birefringent, could be made using a super-intense pump beam to prepare the qvac and a moderately-intense counterpropagating probe beam to scatter photons as they traverse the excited qvac. We will discuss key conditions (e.g., pulse widths, beam waists, spatial profiles, the state of the physical vacuum, etc.) that would render the scattered photons detectable above the noise. Numerical simulations will be presented [1], which show an experiment of this nature is barely feasible at intensities of 1023 W/cm2 and most promising at 1024 W/cm2, prior to the breakdown of the qvac at higher intensities. |
Friday, October 21, 2022 11:54AM - 12:12PM |
YM09.00009: New and old physics in the interaction of a radiating electron with the extreme electromagnetic field Martin Jirka, Pavel Sasorov, Sergei V Bulanov We show that an all-optical configuration of the laser-electron collision in the λ3 configuration based on 10 PW-class lasers presents a viable platform for reaching the range of parameters where a perturbative QED in strong external electromagnetic field breaks. This case is contingently referred to as a case of the nonperturbative QED, and this range of parameters is the intriguing goal from an experimental point of view because of the possible manifestation of a new physics of the interaction of a highly radiating particle with a strong electromagnetic field. We show that the strong-field region can be reached by electrons having initial energy higher than 50 GeV. Our theoretical considerations are in agreement with three-dimensional particle-in-cell simulations. While increasing of the electron energy raises the number of electrons experiencing the strong-field region, the observable signature of photon emission radiative correction in the strong field is expected to fade out when the electron energy surpasses the optimal value. This threshold of electron energy is identified and the parameters for achieving the nonperturbative limit of QED are provided. |
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