A5016785514- Laser-Plasma Interactions and Diagnostics
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Laser-induced spectroscopy and plasma
- Pulsed Power Technology Applications
- Atomic and Molecular Physics
- Laser-Matter Interactions and Applications
- Particle Detector Development and Performance
- Gyrotron and Vacuum Electronics Research
- Laser Design and Applications
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Fusion materials and technologies
- High-pressure geophysics and materials
- Nuclear Physics and Applications
- Ion-surface interactions and analysis
- Solid State Laser Technologies
- Muon and positron interactions and applications
- Laser Material Processing Techniques
- Radiation Therapy and Dosimetry
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Dust and Plasma Wave Phenomena
Beijing Normal University
2019-2024
Luoyang Central Hospital Affiliated to Zhengzhou University
2024
University of California, Los Angeles
2011-2020
Astronomy and Space
2016
University of Maryland, College Park
2015
SLAC National Accelerator Laboratory
2010-2013
Menlo School
2013
UCLA Health
2013
Budker Institute of Nuclear Physics
2010
Max Planck Society
2010
Abstract Plasma wakefield accelerators have been used to accelerate electron and positron particle beams with gradients that are orders of magnitude larger than those achieved in conventional accelerators. In addition being accelerated by the plasma wakefield, beam particles also experience strong transverse forces may disrupt quality. Hollow channels proposed as a technique for generating accelerating fields without forces. Here we demonstrate method creating an extended hollow channel...
FACET—Facilities for Accelerator science and Experimental Test beams at SLAC—will provide high-energy-density electron positron with peak currents of roughly 20 kA that will be focused down to a 10 μm×10 μm transverse spot size an energy ∼23 GeV. With FACET, the SLAC linac support unique program concentrating on second-generation research in plasma wakefield acceleration. Topics include high-gradient acceleration narrow spread preserved emittance, beam loading This paper describes FACET...
Phase space matching between two plasma-based accelerator (PBA) stages and a PBA traditional component is critical issue for emittance preservation. The drastic differences of the transverse focusing strengths as beam propagates components may lead to catastrophic growth even when there small energy spread. We propose using linear forces from nonlinear wakes in longitudinally tailored plasma density profiles control phase sections with negligible growth. Several are considered theoretical...
During the past two decades of research, ultra-relativistic beam-driven plasma wakefield accelerator (PWFA) concept has achieved many significant milestones. These include demonstration ultra-high gradient acceleration electrons over meter-scale structures, efficient a narrow energy spread electron bunch at high-gradients, positron using wakes in uniform plasmas and hollow channels, demonstrating that highly nonlinear 'blow-out regime' have electric field structure necessary for preserving...
In situ generation of a high-energy, high-current, spin-polarized electron beam is an outstanding scientific challenge to the development plasma-based accelerators for high-energy colliders. this Letter, we show how such relativistic can be produced by ionization injection electrons certain atoms with circularly polarized laser field into beam-driven plasma wakefield accelerator, providing much desired one-step solution challenge. Using time-dependent Schrödinger equation (TDSE) simulations,...
The generation of very high quality electron bunches (high brightness and low energy spread) from a plasma-based accelerator in the three-dimensional blowout regime using self-injection tailored plasma density profiles is analyzed theoretically with particle-in-cell simulations. underlying physical mechanism that leads to electrons uncovered by tracking trajectories as they cross sheath are trapped wake. Details on how intensity driver scale-length control ultimate beam described....
The evolution of beam phase space in ionization injection into plasma wakefields is studied using theory and particle-in-cell simulations. process involves both longitudinal transverse mixing, leading initially to a rapid emittance growth followed by oscillation, decay, slow saturation. An analytic for this presented verified through This includes the effects distance (time), acceleration distance, wakefield structure, nonlinear charge forces, it also shows how ultralow beams can be produced methods.
Plasma wakefield acceleration in the blowout regime is particularly promising for high-energy of electron beams because its potential to simultaneously provide large gradients and high energy transfer efficiency while maintaining excellent beam quality. However, no equivalent positron plasma wakes has been discovered date. We show that after a short propagation distance, an asymmetric drives stable hollow channel can be both accelerating focusing beam. A charge bunch placed at suitable...
Hollow channel plasma wakefield acceleration is a proposed method to provide high gradients for electrons and positrons alike: key future lepton colliders. However, beams which are misaligned from the axis induce strong transverse wakefields, deflecting reducing collider luminosity. This undesirable consequence sets tight constraint on alignment accuracy of beam propagating through channel. Direct measurements misalignment-induced wakefields therefore essential designing mitigation...
An electron beam has gained a maximum energy of 9 GeV per particle in 1.3 m-long beam-driven plasma wakefield accelerator. The amount charge accelerated the spectral peak was 28.3 pC, and root-mean-square spread 5.0%. mean gain 215 shot data set 115 pC 5.3 GeV, respectively, corresponding to an acceleration gradient 4.0 GeV/m at peak. 5.1%. These results are consistent with extrapolation previously reported using shorter, 36 cm-long source within 10%, evincing non-evolving wake structure...
High gradients of energy gain and high efficiency are necessary parameters for compact, cost-efficient high-energy particle colliders. Plasma Wakefield Accelerators (PWFA) offer both, making them attractive candidates next-generation In these devices, a charge-density plasma wave is excited by an ultra-relativistic bunch charged particles (the drive bunch). The in the can be extracted second trailing bunch), as this propagates wake bunch. While electron was accelerated with more than...
Plasma-based acceleration is being considered as the basis for building a future linear collider. Nonlinear plasma wakefields have ideal properties accelerating and focusing electron beams. Preservation of emittance nano-Coulomb beams with nanometer scale matched spot sizes in these remains critical issue due to ion motion caused by their large space charge forces. We use fully resolved quasistatic particle-in-cell simulations hydrogen lithium plasmas, including when accelerated beam has...
Abstract High repetition rates and efficient energy transfer to the accelerating beam are important for a future linear collider based on beam-driven plasma wakefield acceleration scheme (PWFA-LC). This paper reports first results from Plasma Wakefield Acceleration Collaboration (E300) that beginning address both of these issues using recently commissioned FACET-II facility at SLAC national accelerator laboratory. We have generated meter-scale hydrogen plasmas time-structured 10 GeV electron...
This document provides detailed information on the status of Advanced and Novel Accelerators techniques describes steps that need to be envisaged for their implementation in future accelerators, particular high energy physics applications. It complements overview prepared update European Strategy particle physics, a description field. The scientific priorities community are described each technique acceleration able achieve accelerating gradient GeV~range or above. ALEGRO working group...
We show through experiments and supporting simulations that propagation of a highly relativistic dense electron bunch plasma can lead to distributed injection electrons, which depletes the accelerating field, i.e., beam loads wake. The source injected electrons is ionization second rubidium (Rb II) within This excess charge large enough severely load wake, thereby reduce transformer ratio T. reduction average T with increasing loading quantified for first time by measuring peak energy gain...
Ionization injection is attractive as a controllable scheme for generating high quality electron beams using plasma-based wakefield acceleration. Because of the phase-dependent tunneling ionization rate and trapping dynamics within nonlinear wake, discrete electrons wake nonlinearly mapped to final phase space structure beam at location where are trapped. This phenomenon theoretically analyzed examined by three-dimensional particle-in-cell simulations which show that effects limit wave...
Plasma accelerators driven by particle beams are a very promising future accelerator technology as they can sustain high accelerating fields over long distances with energy efficiency. They rely on the excitation of plasma wave in wake drive beam. To generate plasma, neutral gas be field-ionized head beam, which case distance acceleration and gain strongly limited erosion. Here we overcome this limit demonstrate that electrons tail beam accelerated up to 27 GeV high-ionization-potential...
Chimeric antigen receptor T (CAR-T) cell therapy is a new treatment for cancers, but reports on curing immune-related skin diseases are limited. We report case of successful CAR-T-cell in patient with refractory/relapsed diffuse large B-cell lymphoma (R/R DLBCL) who was incidentally cured chronic generalized plaque psoriasis. The patient, 65-year-old male had known history psoriasis 45 years, did not receive immunotherapy during this period. Imaging, molecular biology and immunology...