A5023607850- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Particle accelerators and beam dynamics
- Laser Design and Applications
- Particle Accelerators and Free-Electron Lasers
- Laser-Matter Interactions and Applications
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Atomic and Molecular Physics
- Pulsed Power Technology Applications
- Laser Material Processing Techniques
- Ion-surface interactions and analysis
- Ionosphere and magnetosphere dynamics
- Gyrotron and Vacuum Electronics Research
- Nuclear Physics and Applications
- Dust and Plasma Wave Phenomena
- High-pressure geophysics and materials
- Electron and X-Ray Spectroscopy Techniques
- Medical Imaging Techniques and Applications
- Mass Spectrometry Techniques and Applications
- Fusion materials and technologies
- Optical Systems and Laser Technology
- Atmospheric and Environmental Gas Dynamics
- Advanced Data Storage Technologies
- Spectroscopy and Laser Applications
Stony Brook University
2017-2024
Brookhaven National Laboratory
2022-2023
Brookhaven College
2022
State University of New York
2019
University of California, Los Angeles
2012-2018
University of Alberta
2008-2009
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...
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...
We show the first experimental demonstration that electrons being accelerated in a laser wakefield accelerator operating forced or blowout regimes gain significant energy from both direct acceleration (DLA) and mechanisms. Supporting full-scale 3D particle-in-cell simulations elucidate role of DLA when ionization injection is employed. An explanation given for how can maintain resonance condition despite evolving properties drive electrons. The produced electron beams exhibit characteristic...
Abstract Laser-driven plasma accelerators provide tabletop sources of relativistic electron bunches and femtosecond x-ray pulses, but usually require petawatt-class solid-state-laser pulses wavelength λ L ~ 1 μ m. Longer- lasers can potentially accelerate higher-quality bunches, since they less power to drive larger wakes in dense plasma. Here, we report on a self-injecting accelerator driven by long-wave-infrared laser: chirped-pulse-amplified CO 2 laser ( ≈ 10 m). Through optical...
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...
We have investigated the role that transverse electric field of laser plays in acceleration electrons a wakefield accelerator operating quasi-blowout regime through particle-in-cell code simulations. In order to ensure longitudinal compression and/or focusing pulse is not needed before wake can self-trap plasma electrons, we employed ionization injection technique. Furthermore, density varied such at lowest densities, occupies only fraction first wavelength oscillation (the accelerating...
Abstract Laser-plasma accelerators are capable of sustaining accelerating fields 10–100 GeV/m, 100–1000 times that conventional technology and the highest produced by any widely researched advanced accelerator concepts. also intrinsically accelerate short particle bunches, several orders magnitude shorter than technology, which leads to reductions in beamstrahlung and, hence, savings overall power consumption reach a desired luminosity. These properties make laser-plasma promising for more...
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...
The Facility for Advanced Accelerator and Experimental Tests (FACET) at SLAC installed a 10-TW Ti : sapphire laser system pre-ionized plasma wakefield acceleration experiments. High energy (500 mJ), short (50 fs) pulses of 800 nm light 1 Hz are used the FACET experimental area to produce column. stretched 250 fs before injection into vapor cell, where is focused by an axicon lens form column that can be sustained over desired radius length. A 20 GeV electron bunch interacts with this...
We present a laser-ionized, beam-driven, passive thin plasma lens that operates in the nonlinear blowout regime. This provides axisymmetric focusing for relativistic electron beams at strengths unobtainable by magnetic devices. It is tunable, compact, and it imparts little to no spherical aberrations. The combination of these features make more attractive than other types lenses highly divergent beams. A case study built on beam matching into wakefield accelerator SLAC National Accelerator...
Spatiotemporal control over the intensity of a laser pulse has potential to enable or revolutionize wide range laser-based applications that currently suffer from poor flexibility offered by conventional optics. Specifically, these optics limit region high Rayleigh and provide little no trajectory peak intensity. Here, we introduce nonlinear technique for spatiotemporal control, "self-flying focus," produces an arbitrary can be sustained distances comparable focal length. The combines...
Abstract Large scale laser facilities are needed to advance the energy frontier in high physics and accelerator physics. Laser plasma accelerators core advanced concepts aimed at reaching TeV electron colliders. In these facilities, intense pulses drive plasmas used accelerate electrons energies remarkably short distances. A could principle reach with an accelerating length that is 1000 times shorter than conventional RF based accelerators. Notionally, driven particle beam beyond state of...
Abstract Quasi-monoenergetic electron beams of energies 12 MeV to over 200 are generated from both nitrogen and helium gas targets with 7TW laser pulses. Typically interactions lead bunches in the range 50 varying shot shot. Helium leads higher energy 25 100 MeV. Occasionally exceptionally high electrons up observed helium. Initial full two-dimensional simulations indicate production 20–30 for typical interaction conditions as injected wave breaking plasma wake behind pulse into strong...
Long-wave infrared (LWIR) picosecond pulses with multi-terawatt peak power have recently become available for advanced high-energy physics and material research. Multi-joule pulse energy is achieved in an LWIR laser system via amplification of a microjoule seed high-pressure, mixed-isotope CO2 amplifiers. A chirped-pulse (CPA) scheme employed such to reduce the nonlinear interaction between optical field transmissive elements system. Presently, research development effort underway towards...
An electron or electron-positron beam streaming through a plasma is notoriously prone to microinstabilities. For dilute ultrarelativistic infinite beam, the dominant instability mixed mode between longitudinal two-stream and transverse filamentation modes, with phase velocity oblique velocity. A spatiotemporal theory describing linear growth of this proposed which predicts that effects generally prevail for finite-length beams, leading significantly slower evolution than in usually assumed...
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...
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...
Abstract The preservation of emittance the accelerating beam is next challenge for plasma-based accelerators envisioned future light sources and colliders. field structure a highly nonlinear plasma wake potentially suitable this purpose but has not been yet measured. Here we show that longitudinal variation fields in wakefield accelerator cavity produced by relativistic electron bunch can be mapped using itself as probe. We find that, much devoid electrons, transverse force constant...
Long wavelength infrared laser-driven plasma wakefield accelerators are investigated here in the self-modulated laser acceleration (SM-LWFA) and blowout regimes using 3D particle-in-cell simulations. The simulation results show that SM-LWFA regime, self-injection arises with wave breaking, whereas is not observed under conditions. breaking process regime occurs at a field strength significantly below 1D wave-breaking threshold. This intensifies higher power density suppressed low densities...
3D numerical simulations of the interaction a powerful CO2 laser with hydrogen jets demonstrating role ionization in characteristics induced wakes are presented. Simulations using SPACE, parallel relativistic particle-in-cell code, performed support plasma wakefield accelerator experiments being conducted at Brookhaven National Laboratory (BNL) Accelerator Test Facility (ATF). A novelty SPACE code is its set efficient atomic physics algorithms that compute and recombination rates on grid...
Strategies for mitigating ionization-induced beam head erosion in an electron-beam-driven plasma wakefield accelerator (PWFA) are explored when the and wake both formed by transverse electric field of itself. Beam can occur a preformed because lack focusing force from at rising edge (head) due to finite inertia electrons. When is produced ionization space charge beam, significantly exacerbated gradual recession (in frame) 100% contour. particles front cannot be focused (guided) causing them...
Weibel-type instability can self-generate and amplify magnetic fields in both space laboratory plasmas with temperature anisotropy. The electron Weibel has generally proven more challenging to measure than its ion counterpart owing the much smaller inertia of electrons, resulting a faster growth rate characteristic wavelength. Here, we have probed evolution two-dimensional distribution field components current density due instability, $\rm CO_2$-ionized hydrogen gas (plasma) picosecond...