A5037364731- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- High-pressure geophysics and materials
- Particle Accelerators and Free-Electron Lasers
- Advanced X-ray Imaging Techniques
- Atomic and Molecular Physics
- Ionosphere and magnetosphere dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Solar and Space Plasma Dynamics
- 3D Modeling in Geospatial Applications
- Pulsed Power Technology Applications
- Astrophysical Phenomena and Observations
- Advanced MRI Techniques and Applications
- Mass Spectrometry Techniques and Applications
- Medical Imaging Techniques and Applications
- Radiation Therapy and Dosimetry
SLAC National Accelerator Laboratory
2021-2023
Lund University
2015-2022
Czech Academy of Sciences, Institute of Physics
2017
Imperial College London
2017
John Adams Institute for Accelerator Science
2017
Sources of high-energy photons have important applications in almost all areas research. However, the photon flux and intensity existing sources is strongly limited for energies above a few hundred keV. Here we show that high-current ultrarelativistic electron beam interacting with multiple submicrometer-thick conducting foils can undergo strong self-focusing accompanied by efficient emission gamma-ray synchrotron photons. Physically, originate from interaction near-field transition...
We report on a study controlled injection of electrons into the accelerating phase plasma wakefield accelerator by tailoring target density distribution using two independent sources gas. The tailored is achieved experimentally inserting narrow nozzle, with an orifice diameter only $400\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$, jet gas supplied from 2 mm nozzle. combination these nozzles used to create regions different connected gradient. Using this setup we show control charge and energy...
One challenge in the development of laser wakefield accelerators is to demonstrate sufficient control and reproducibility parameters generated bunches accelerated electrons. Here we report on a numerical study, where that trapping using density down-ramps allows for tuning several electron bunch by varying properties down-ramp. We show length determined difference before after ramp. Furthermore, transverse emittance controlled steepness Finally, amount trapped charge depends both emphasize...
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...
Nanostructured and microstructured thin foils have been fabricated used experimentally as targets to manipulate the spatial profile of proton bunches accelerated through interaction with high intensity laser pulses ($6\ifmmode\times\else\texttimes\fi{}{10}^{19}\text{ }\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$). Monolayers polystyrene nanospheres were placed on rear surfaces plastic improve homogeneity beams. Moreover, grating structures various configurations their sides modify beam divergence....
In this Letter, we report for the first time, to best of our knowledge, possibility visualizing an atomizing spray by simultaneously recording x-ray absorption and two-photon laser-induced fluorescence imaging. This unique illumination/detection scheme is made possible due use soft x rays emitted from a laser-driven source. An 800 mJ laser pulse 38 fs duration used generate beam with up <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mn>4</mml:mn>...
To improve the stability and reproducibility of laser wakefield accelerators to allow for future applications, controlling injection electrons is great importance. This allows us control amount charge in beams accelerated final energy electrons. Results are presented from a recent experiment on controlled using scheme colliding pulses performed Lund multi-terawatt laser. Each pulse split into two parts close interaction point. The main focused 2 mm diameter gas jet drive nonlinear plasma...
We report on a study controlled trapping of electrons, by field ionization nitrogen ions, in laser wakefield accelerators variable length gas cells. In addition to ionization-induced the density plateau inside cells, which results wide, but stable, electron energy spectra, regime localized down-ramp at exit is found. The resulting spectra are peaked, with 10% shot-to-shot fluctuations peak energy. Ionization-induced electrons way trap and accelerate large number thus improving efficiency...
Highly collimated betatron radiation from a laser wakefield accelerator is promising tool for spectroscopic measurements. Therefore there requirement to create spectrometers suited the unique properties of such source. We demonstrate spectrometer which achieves an energy resolution < 5 eV at 9 keV and angularly resolving x-ray emission allowing reference spectrum be recorded same time. The single photon analysis used significantly reduce background noise. Theoretical performance various...
This study documents several correlations observed during the first run of plasma wakefield acceleration experiment E300 conducted at FACET-II, using a single drive electron bunch. The established include those between measured maximum energy loss beam and integrated betatron X-ray signal, calculated total deposited in among three visible light emission measuring cameras signal. signal correlates almost linearly with both into plasma, demonstrating its usability as measure transfer from to...
X-ray phase-contrast imaging allows for non-invasive analysis in low-absorbing materials, such as soft tissue. Its application medical or materials science has yet to be realized on a wider scale due the requirements source, demanding high flux and small source size. Laser wakefield accelerators generate betatron X-rays fulfilling these criteria can suitable sources imaging. In this work, we present first images obtained by using ionization injection-based laser acceleration, which results...
In this work, we experimentally study the effects of nitrogen concentration in laser wakefield acceleration electrons a gas mixture hydrogen and nitrogen. A 15 TW peak power pulse is focused to ionize gas, excite plasma wave accelerate up 230 MeV. We find that at dopant concentrations above 2% total divergence increased high energy are emitted preferentially with an angle ±6 mrad, leading forked spatio-spectral distribution associated direct (DLA). However, can gain more have lower than 4...
Nano and micro structured thin (μ m-scale) foils were designed, fabricated irradiated with the high intensity laser system operating at LLC (Lund Laser Centre, Sweden) in order to systematically study improve main proton beam parameters. Nano-spheres deposited on front (laser irradiated) surface of a flat Mylar foil enabled small enhancement maximum energy number accelerated protons. rear side allowed modify spatial profile. In particular, nanospheres target, homogeneity was clearly...
We explore the implications of a transverse density gradient on performance an underdense plasma lens and nonlinear plasma-based accelerator. Transverse gradients are unavoidable in sources formed outflow standard gas jets, which used heavily accelerator communities. These lead to longitudinal variations wakefields, can transversely deflect electron beam within blowout wake. present theoretical model fields cavity based empirical analysis 3D particle-in-cell (PIC) simulations. Using this...
The MAX IV Laboratory is a synchrotron radiation user facility located just outside the city of Lund, Sweden. made up two storage rings, at 3 GeV and 1.5 GeV, respectively, linear accelerator, serving as full-energy injector for rings well driver Short-Pulse Facility (SPF) downstream extraction point to ring. Recently, part Soft X-ray Laser (SXL) project, design study towards using linac soft free-electron laser (FEL) was started. Part commissioning diagnostics beamline based on Transverse...
This study documents several correlations observed during the first run of plasma wakefield acceleration experiment E300 conducted at FACET-II, using a single drive electron bunch. The established include those between measured maximum energy loss beam and integrated betatron x-ray signal, calculated total deposited in among three visible light emission measuring cameras, signal. signal correlates almost linearly with both into plasma, demonstrating its usability as measure transfer from to...
Plasma-wakefield acceleration (PWFA) relies on the interaction between intense particle bunches and plasma for reaching higher accelerating gradients than what is possible with conventional radio-frequency technology. Using ultra-relativistic beam drivers allows long lengths have potential applications such as energy booster stages synchrotron light sources or linear colliders generating ultra-high-brightness beams from background plasma. In this article, we present start-to-end simulations...
Plasma Wakefield Acceleration (PWFA) provides ultrahigh acceleration gradients of 10s GeV/m, providing a novel path towards efficient, compact, TeV-scale linear colliders and high brightness free electron lasers. Critical to the success these applications is demonstrating simultaneously gradient acceleration, energy transfer efficiency, preservation emittance, charge, spread. Experiments at FACET-II National User Facility SLAC Accelerator Laboratory aim achieve all milestones in single stage...