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 BO08: Beam-Plasma Wakefield, High Field Physics, and DiagnosticsLive Streamed
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Chair: Yong Ma, University of Michigan Room: 402 ABC |
Monday, October 17, 2022 9:30AM - 9:42AM |
BO08.00001: Study of ionization and rotational dynamics of molecules under intense laser fields and spectral broadening via laser filamentation Dennis Dempsey, Garima C Nagar, Jack W Agnes, Nicole A Batista, Bonggu Shim
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Monday, October 17, 2022 9:42AM - 9:54AM |
BO08.00002: Experimental techniques for measurement of ultra-high-intensity laser generated gamma rays at ELI Beamlines Gaëtan Fauvel, Peter Rubovic, Florian Condamine, Mario Manuel, Alexey Arefiev, Kavin Tangtartharakul, Yutong He, Stefan Weber Production of intense and energetic gamma-ray sources in dense laser-irradiated plasmas is of fundamental interest in many fields of science (two-photon pair production, medical isotope production, nuclear waste analysis, etc.). One of the techniques to generate such photons is the interaction of an ultra-high-intensity laser pulse with low-mass foam targets. In these conditions, where the electron density is close to the plasma critical density, very strong magnetic fields (multi-GG) are generated. These magnetic fields enhance electron acceleration inside the plasma, which consequently, emit gamma rays from tens to hundreds of MeV. The currently available L3 high-repetition rate PW-class laser (30J, 30fs, 10Hz) at ELI Beamlines fulfills the requirements for such research. |
Monday, October 17, 2022 9:54AM - 10:06AM Author not Attending |
BO08.00003: Kilo-Tesla magnetic fields in the magnetic vortex acceleration regime – a prospective experimental diagnostic Bruno Gonzalez-Izquierdo, Marius Schollmeier, Michael Touati, Anja Schuster, Peter Fischer, Valeriu Scutelnic, Georg Korn, Sven Steinke Magnetic Vortex Ion Acceleration (MVA) is characterized by the self-generation of a strong azimuthal magnetic field (up to hundreds of kilo-Tesla) in the interaction of ultraintense laser-beams with near-critical-density (NCD) targets. Experimental validation of kilo-Tesla magnetic fields could provide a more profound understanding not only of MVA, but also of fusion processes where strong magnetic fields may be generated (Ruhl and Korn, arXiv:2202.03170v5, 2022). |
Monday, October 17, 2022 10:06AM - 10:18AM |
BO08.00004: Hard x-ray radiography with a 1D-imaging micro-flag backlighter driven by NIF-ARC Matthew P Hill, Jackson G Williams, Daniel H Kalantar, Benjamin Bachmann, Riccardo Tommasini, David A Martinez, Camelia V Stan, Anna Murphy, Matthew J Arend, Gino A Mercado, Henry C Wong, Zach Dunn, Thomas E Lockard, Edward T Gumbrell, Robert E Rudd, Korbie K Le Galloudec, Bruce A Remington, James M McNaney, Hye-Sook Park Plastic deformation of samples ramp compressed to Mbar pressures at high strain rates forms the basis of ongoing dynamic material strength experiments at the National Ignition Facility. Hard x-ray radiography (>40 keV) is the primary means of measuring the evolution of these samples and initial trials with a source driven by the ARC laser suggest that a significant gain in spatio-temporal resolution can be achieved over the existing NIF-driven source, in agreement with expectations from previous work. |
Monday, October 17, 2022 10:18AM - 10:30AM |
BO08.00005: Machine learning-based analysis of an electron spectrometer for high-repetition-rate laser-driven particle acceleration experiments Kelly K Swanson, Derek A Mariscal, Ghassan Zeraouli, Blagoje Z Djordjevic, Bryan Sullivan, Ryan Nedbailo, Graeme G Scott, Reed C Hollinger, Shoujun Wang, Jorge J Rocca, Tammy Ma Accurately and rapidly diagnosing laser-plasma interactions is often difficult due to the time-intensive nature of the analysis and will only become more so with the rise of high-repetition-rate lasers. Whereas image analysis often takes several seconds even with a well-constructed algorithm, a laser-driven experiment operating at 10 Hz would need parameters of interest extracted in less than 100 ms to allow for real-time feedback and control. Machine learning-based diagnostic analysis can address this problem while maintaining a high degree of accuracy. We report on the application of machine learning to the analysis of a scintillator-based electron spectrometer for high-intensity, laser-plasma experiments at the CSU ALEPH facility. Our approach utilizes a neural network trained on synthetic data and tested on experiments to extract important electron distribution parameters. Leveraging transfer learning, we improved the accuracy of the neural network for analyzing experimental data at the speeds required in high repetition rate experiments. |
Monday, October 17, 2022 10:30AM - 10:42AM |
BO08.00006: Generation and optimization of high quality multi-GeV electron beams using an evolving electron driver in the nonlinear blowout regime Thamine Dalichaouch, Xinlu Xu, Fei Li, Adam R Tableman, Frank S Tsung, Warren B Mori Plasma-based acceleration (PBA) is promising approach for generating high quality ultrarelativistic beams to drive next-gen x-ray light sources and particle collider experiments. Over the years, research has largely focused on injection methods that use a density down ramp or field ionization to generate high quality beams. Recently, we proposed a new method of controllable injection that relies on focusing an electron drive beam in a nonlinear plasma wakefield [1]. Using the approach, injection was demonstrated in two different regimes using OSIRIS particle-in-cell (PIC) simulations. In this talk, we present a predictive model to characterize injection triggered by an electron drive beam that is self-focused by the plasma column. The model is used to describe how the wake evolution and final injected beam parameters scale with the drive bunch parameters. Parameter scans from PIC simulations for different drivers are shown and compared with the model predictions. PIC simulations indicate that injection and optimal beam loading can be achieved until the drive beam fully pump depletes. Based on the simulation results, the injected beam can be efficiently accelerated to 18.27 GeV with a projected energy spread of 0.5% and peak normalized brightness of 10^20 A/m^2/rad^2. |
Monday, October 17, 2022 10:42AM - 10:54AM |
BO08.00007: HiPACE++: a portable, 3D quasi-static Particle-in-Cell code Severin Diederichs, Carlo Benedetti, Axel Huebl, Remi Lehe, Alexander Sinn, Weiqun Zhang, Andrew Myers, Jean-Luc Vay, Maxence Thevenet Modeling plasma wakefield accelerators is a computationally challenging task. Using cost-reducing algorithms like the quasi-static approximation allows for efficient modeling of demanding plasma wakefield accelerator scenarios. In this work, we present the latest highlights of the performance-portable, 3D quasi-static particle-in-cell (PIC) code HiPACE++ [1]. The code adopts modern HPC practices like a performance-portability layer, continuous integration, standard I/O formats, and is open-source (https://github.com/Hi-PACE/hipace). HiPACE++ demonstrates orders of magnitude speed-up on modern GPU-equipped supercomputers compared to its CPU-only predecessor HiPACE. Therefore, HiPACE++ enables fast and accurate modeling of challenging simulation settings, including certain positron acceleration schemes or the proton-beam-driven accelerator AWAKE [2]. |
Monday, October 17, 2022 10:54AM - 11:06AM |
BO08.00008: Underdense Plasma Lens Commissioning at FACET-II Christopher E Doss, Robert Ariniello, Valentina Lee, Claire Hansel, John R Cary, Andrew Sutherland, Bernhard Hidding, Henrik Ekerfelt, Brendan O'Shea, Spencer J Gessner, Christine Clarke, Mark Hogan, Michael D Litos Here we report on the early commissioning efforts for the laser-ionized underdense plasma lens experiment at FACET-II. The setup includes a fs Ti:Saph laser pulse that passes through a focusing optic, with the focus located in the outflow of a gas jet and in the electron beamline. The initial design leverages the ionization profile at the focus of a simple spherical lens, where the lens is on a motorized stage that allows the focus to be shifted horizontally with respect to the electron beamline. This allows for the thickness of the plasma lens to be varied and give more control to the focusing force. Additionally, early experiments in the near future using the plasma lens will be discussed. |
Monday, October 17, 2022 11:06AM - 11:18AM Author not Attending |
BO08.00009: Opportunities and challenging seeding the self-modulation instability of a long proton bunch in plasma Patric Muggli Long laser pulses and charged particle bunches propagating in dense plasma are subject to transverse self-modulation (SM) instabilities. SM offers the opportunity to drive large amplitude wakefields with pulses/bunches in principle too long for that purpose [M. Turner et al., Phys. Rev. Lett. 122, 054801 (2019)]. Seeding of SM offers the apportunity to control the final timing and amplitude of the SM process. We have demontrated seeding of the SM of a long proton bunch in plasma using a relativistic ionization front (RIF-SSM) [F. Batsch et al., Phys. Rev. Lett. 126, 164802 (2021)] and using a short electron bunch (eSSM) [L. Verra et al., accepeted for publication in Phys. Rev. Lett., arXiv.2203.13752]. Seeding with a "cut in the electron bunch" was also demonstarted (cSSM) [Y. Fang et al., Phys. Rev. Lett. 112, 045001 (2014)]. We will summarize the experimental results obtained so far with SM seeding. We will outline the pros and cons of the seeding metods for the purpose of using the self-modulated bunch to drive a plasma wakefield acceleration stage [P. Muggli, J. Phys.: Conf. Ser. 1596 012008 (2020)]. In particular, the RIF-SSM is intrinsically simple than RIF-SSM, but SM instability may re-appear. eSSM leads to the SM of the entire bunch, but it may induce or seed the hose instability through misalignment beteen the two bunches. |
Monday, October 17, 2022 11:18AM - 11:30AM |
BO08.00010: Mesh refinement implementation in QuickPIC Qianqian Su, Fei Li, Weiming An, Viktor K Decyk, Yujian Zhao, Lance Hildebrand, Ann S Almgren, Warren B Mori The PWFA has emerged as a promising candidate for the accelerator technology used to build a future linear collider or a light source. In this scheme witness beams are accelerated in the wakefield created by driver beams. The three-dimensional (3D) quasi-static (QS) particle-in-cell (PIC) approach has been shown to provide 2-4 orders of magnitude speedup over 3D fully explicit PIC codes and maintain high fidelity simulation. In some linear collider designs for the electron arm, the matched spot size of the witness beam can be 2 to 3 orders of magnitude smaller than the spot size of the wakefield. To efficiently simulate such a disparity in scales, we implement a mesh refinement scheme into the 3D QS PIC codes, QuickPIC. We use very high resolution in a small spatial region that includes the witness beam and coarse resolution in the simulation domain. The code has been parallelized with both MPI and OpenMP, and the scalability has also been improved by using pipelining. The boundary effect of refined mesh has been studied, based on which we developed a preliminary adaptive mesh refinement for an evolving beam size. Several benchmark cases have been tested and get consistent result as previously published papers and also consistent as a new quasi-3d QS PIC code called QPAD. |
Monday, October 17, 2022 11:30AM - 11:42AM |
BO08.00011: Plasma electron contribution to beam emittance growth from Coulomb collisions in plasma-based accelerators YINJIAN ZHAO, Remi Lehe, Andrew Myers, Maxence Thevenet, Axel Huebl, Carl B Schroeder, Jean-Luc Vay Coulomb collisions with background plasma can cause emittance growth in plasma accelerators. This work extends the theory to consider collisions with not only motionless plasma ions, but also plasma electrons with relativistic motion, based on the Frankel cross-section. The theory is verified by particle-in-cell simulations with a Monte Carlo collision module. It is shown that the electron contribution has the same amount as that of ions in linear acceleration regime, and may not be negligible in nonlinear regime depending on the plasma electron density and its relativistic bulk velocity. |
Monday, October 17, 2022 11:42AM - 11:54AM |
BO08.00012: Initial Results from Relativistically Transparent Magnetic Filament Experiments on the OMEGA EP Laser Hans Rinderknecht, Matthew Van Dusen-Gross, Gerrit Bruhaug, Kathleen Weichman, Mingsheng Wei, Alexey Arefiev, Tao Wang Relativistic transparency allows intense laser pulses to interact with overdense plasmas. With high enough intensity, the dense axial electron current driven by the ponderomotive force generates a magnetic filament with field strength of the order of the laser amplitude (>105 T). This magnetic filament traps the electrons, enabling efficient acceleration and conversion of laser energy into MeV photons by electron oscillations. We present the results of initial experiments to study this phenomenon at moderate intensity (a0 ~ 15 to 30) using the OMEGA EP laser. Experimental signatures of the magnetic filament phenomenon are observed in the recorded electron and photon spectra. The results are compared with 3-D particle-in-cell simulations to assess the dependence of electron acceleration on plasma density. We discuss the prospects for scaling this phenomenon to higher intensities for laser-driven studies of mega-Tesla fields in plasmas and high-efficiency secondary sources; above 6×1021 W/cm2, laser conversion efficiency into MeV photons is predicted to exceed 10%. This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0003856 and Department of Energy under Award Number DE-SC0020431. |
Monday, October 17, 2022 11:54AM - 12:06PM |
BO08.00013: Investigation of Magnetic Vortex Acceleration at BELLA iP2 Sahel Hakimi, Axel Huebl, Stepan Bulanov, Lieselotte Obst-Huebl, Kei Nakamura, Tobias Ostermayr, Carl B Schroeder, Anthony J Gonsalves, Jeroen van Tilborg, Jean-Luc Vay, Eric H Esarey, Cameron R Geddes The interaction of an ultra-intense laser pulse with a near critical density (NCD) target results in the formation of a plasma channel, a strong azimuthal magnetic field and moving vortices. An application of this is the generation of energetic and collimated ion beams via Magnetic Vortex Acceleration (MVA). An experimental campaign is scheduled to study this regime at iP2, the newly constructed short focal length beamline of the BELLA PW facility. A series of 3D simulations, using the WarpX code, was performed to study the robustness of the MVA mechanism when applying our realistic experimental conditions. Of particular interest is the acceleration performance with different laser temporal contrast conditions, in some cases leading to pre-expanded target profiles prior to the arrival of the main pulse. We studied the pre-plasma effects on the structure of the accelerating fields and performed a detailed analysis of the ion beam properties and the efficiency of the process. |
Monday, October 17, 2022 12:06PM - 12:18PM |
BO08.00014: Color center qubit synthesis far from equilibrium with ion pulses from laser-acceleration Wei Liu, Kaushalya Jhuria, Qing Ji, Arun Persaud, Ariel Amsellem, Vsevolod Ivanov, Jacopo Simoni, Walid Redjem, Yertay Zhiyenbayev, Christos Papapanos, Boubacar Kante, Liang Tan, Cameron R Geddes, Tobias Ostermayr, Robert Jacob, Jeroen V Tilborg, Sahel Hakimi, Thomas Schenkel Intense ion pulses from laser-plasma ion acceleration enable rapid local electronic excitation and heating of materials and extend the parameter range for color center qubit synthesis. We characterize multi-species ion pulses with in situ diagnostics and ex situ sample analysis with a series of laser targets (including Kapton and titanium). Intense ion pulses can simultaneously heat and dope materials so that color centers can form directly, without thermal annealing. We quantify color center properties in low temperature photoluminescence measurements where we observe effects of the ion flux and ion fluence on color center formation efficiencies and linewidth broadening. We have identified conditions for formation of high quality G-centers, with an ensemble linewidth of <0.1 nm (full width half maximum), narrower than previously reported. We will discuss requirements for color center qubit integration and opportunities for color center synthesis with intense ion pulses. |
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