A5028312327- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser Design and Applications
- Laser-Matter Interactions and Applications
- Pulsed Power Technology Applications
- Particle Accelerators and Free-Electron Lasers
- Magnetic confinement fusion research
- Nuclear Physics and Applications
- High-pressure geophysics and materials
- Advanced Surface Polishing Techniques
- Plasma Diagnostics and Applications
- Laser Material Processing Techniques
- Particle accelerators and beam dynamics
- Diamond and Carbon-based Materials Research
- Ion-surface interactions and analysis
- Atomic and Molecular Physics
- Advanced Fiber Laser Technologies
- Planetary Science and Exploration
- Advanced Optical Sensing Technologies
- Particle Detector Development and Performance
- Optical Systems and Laser Technology
- Advancements in Semiconductor Devices and Circuit Design
- Solid State Laser Technologies
- Radiation Therapy and Dosimetry
- Semiconductor Lasers and Optical Devices
Lawrence Berkeley National Laboratory
2016-2025
University of Ontario Institute of Technology
2024
University of Michigan
2009-2023
University of California, Berkeley
2009-2021
Keldysh Institute of Applied Mathematics
2016-2021
National Institutes for Quantum Science and Technology
2021
Czech Academy of Sciences, Institute of Physics
2021
Euclid Techlabs (United States)
2016
TechLab (United States)
2016
Institute for Theoretical and Experimental Physics
2016
Multi-GeV electron beams with energy up to 4.2 GeV, 6% rms spread, 6 pC charge, and 0.3 mrad divergence have been produced from a 9-cm-long capillary discharge waveguide plasma density of ≈7×1017 cm−3, powered by laser pulses peak power PW. Preformed waveguides allow the use lower compared unguided structures achieve same beam energy. A detailed comparison between experiment simulation indicates sensitivity in this regime guiding acceleration structure input intensity, density, near-field...
Guiding of relativistically intense laser pulses with peak power 0.85 PW over 15 diffraction lengths was demonstrated by increasing the focusing strength a capillary discharge waveguide using inverse bremsstrahlung heating. This allowed for production electron beams quasimonoenergetic peaks up to 7.8 GeV, double energy that previously demonstrated. Charge 5 pC at GeV and 62 in 6 peaks, typical beam divergence 0.2 mrad.
X-ray spectroscopy is used to obtain single-shot information on electron beam emittance in a low-energy-spread 0.5 GeV-class laser-plasma accelerator. Measurements of betatron radiation from 2 20 keV CCD and single-photon counting techniques. By matching x-ray spectra models, the bunch radius inside plasma estimated be $\ensuremath{\sim}0.1\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$. Combining this with simultaneous spectra, normalized transverse as low 0.1 mm mrad, consistent...
Compact, tunable, radially symmetric focusing of electrons is critical to laser-plasma accelerator (LPA) applications. Experiments are presented demonstrating the use a discharge-capillary active plasma lens focus 100-MeV-level LPA beams. The can provide tunable field gradients in excess 3000 T/m, enabling cm-scale focal lengths for GeV-level beam energies and allowing LPA-based electron beams light sources maintain their compact footprint. For range strengths, excellent agreement with...
A laser system producing controllable and stable pulses with high power ultrashort duration at repetition rate is a key component of energy laser-plasma accelerator (LPA). Precise characterization control properties are essential to understanding interactions required build 10-GeV class LPA. This paper discusses the diagnostics, performance parameters 1 Hz, petawatt (PW) Berkeley Lab Laser Accelerator (BELLA) facility. The BELLA PW provided up 46 J on target 1% level fluctuation 1.3-μrad...
Abstract Radiotherapy is the current standard of care for more than 50% all cancer patients. Improvements in radiotherapy (RT) technology have increased tumor targeting and normal tissue sparing. Radiations at ultra-high dose rates required FLASH-RT effects sparked interest potentially providing additional differential therapeutic benefits. We present a new experimental platform that first one to deliver petawatt laser-driven proton pulses 2 MeV energy 0.2 Hz repetition rate by means...
We measure the high-intensity laser propagation throughout meter-scale, channel-guided laser-plasma accelerators by adjusting length of plasma channel on a shot-by-shot basis, showing high-quality guiding 500 TW pulses over 30 cm in hydrogen density n_{0}≈1×10^{17} cm^{-3}. observed transverse energy transport higher-order modes first ≈12 channel, followed quasimatched propagation, and gradual, dark-current-free depletion to wake. quantify laser-to-wake transfer efficiency limitations...
We show that multi-GeV laser wakefield electron accelerators in meter-scale, low density hydrodynamic plasma waveguides operate a new nonlinear propagation regime dominated by sustained beating of lowest order modes the ponderomotively modified channel; this occurs whether or not injected pulse is linearly matched to guide. For continuously doped gas jet, emergent mode effect leads axially modulated enhancement ionization injection and energy spectrum multiple quasimonoenergetic peaks; same...
Laser wakefield accelerators can produce electric fields of order 10–100GV∕m, suitable for acceleration electrons to relativistic energies. The wakefields are excited by a relativistically intense laser pulse propagating through plasma and have phase velocity determined the group light pulse. Two important effects that limit distance hence net energy gain obtained an electron diffraction drive particle-wake dephasing. Diffraction focused ultrashort be overcome using preformed channels....
Transverse interferometric measurements are presented of the plasma channel formed in a hydrogen-filled capillary discharge waveguide recently used to generate 1 GeV electrons laser-driven accelerator for first time. The were found be good agreement with nonlocal thermal equilibrium simulations, but showed significant differences results quasistatic model developed by Bobrova et al. [Phys. Rev. E. 65, 016407 (2001)]. determine scaling laws axial electron density and matched spot size...
Abstract Silicon-based quantum emitters are candidates for large-scale qubit integration due to their single-photon emission properties and potential spin-photon interfaces with long spin coherence times. Here, we demonstrate local writing erasing of selected light-emitting defects using femtosecond laser pulses in combination hydrogen-based defect activation passivation at a single center level. By choosing forming gas (N 2 /H ) during thermal annealing carbon-implanted silicon, can select...
The generation of quasimonoenergetic electron beams, with energies up to 200 MeV, by a laser-plasma accelerator driven in hydrogen-filled capillary discharge waveguide is investigated. Injection and acceleration electrons found depend sensitively on the delay between onset current arrival laser pulse. A comparison spectroscopic interferometric measurements suggests that injection assisted ionization atoms or ions within channel.
Abstract The development of optical metrology suited to ultrafast lasers has played a key role in the progress these light sources last few decades. Measurement techniques providing complete E -field ultrashort laser beams both time and space are now being developed. Yet, they had so far not been applied most powerful lasers, which reach PetaWatt range by pushing chirped pulse amplification (CPA) scheme its present technical limits. This situation left doubts on their actual performance,...
The investigation of spatio-temporal couplings (STCs) broadband light beams is becoming a key topic for the optimization as well applications ultrashort laser systems. This calls accurate measurements STCs. Yet, it only recently that such complete or spatio-spectral characterization has become possible, and so far mostly been implemented at output systems, where experiments take place. In this survey, we present first time STC different stages collection high-power all based on chirped-pulse...
Active plasma lenses have attracted interest in novel accelerator applications due to their ability provide large-field-gradient (short focal length), tunable, and radially symmetric focusing for charged particle beams. However, if the discharge current is not flowing uniformly as a function of radius, one can expect varying field gradient well potential emittance degradation. We investigated this experimentally 1-mm-diameter active lens. The measured near-axis approximately 35% larger than...
Laser pulses with peak power 0.3 PW were used to generate electron beams energy >4 GeV within a 9 cm-long capillary discharge waveguide operated plasma density of ≈7×1017 cm−3. Simulations showed that the super-Gaussian near-field laser profile is typical high-power femtosecond systems reduces efficacy guiding in parabolic channels compared Gaussian are typically simulated. In experiments, this was mitigated by increasing and hence contribution self-guiding. This allowed for generation...
A hydrogen-filled capillary discharge waveguide operating at kHz repetition rates is presented for parameters relevant to laser plasma acceleration (LPA). The current pulse was optimized erosion mitigation with guiding experiments and MHD simulation. Heat flow simulations measurements showed modest temperature rise the wall due average heat load water-cooled capillaries, which promising applications of LPAs such as high power radiation sources.
We describe the first demonstration of a collisionally excited optical-field-ionization laser driven within waveguide. Lasing on $4{d}^{9}5d\mathrm{\text{\ensuremath{-}}}4{d}^{9}5p$ transition at 41.8 nm in ${\mathrm{X}\mathrm{e}}^{8+}$ was observed to be closely correlated conditions under which pump pulses were guided well by gas-filled capillary discharge Simulations propagation radiation show that gain achieved over essentially whole 30 mm length
We present a study of laser-ion acceleration, where an increased laser spot size leads to sheath field geometries that accelerate ion beams narrow and achromatic divergence at unprecedented charge densities, resulting from the high aspect ratio acceleration distance. Matching pulse length transverse mitigated sweeping across target front side optimized with maximum energies deviating significantly linear intensity scaling.
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...