A5021523215- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- High-pressure geophysics and materials
- Laser Design and Applications
- Atomic and Molecular Physics
- Magnetic confinement fusion research
- Particle Accelerators and Free-Electron Lasers
- Plasma Diagnostics and Applications
- Nuclear physics research studies
- Cold Atom Physics and Bose-Einstein Condensates
- Particle accelerators and beam dynamics
- Ionosphere and magnetosphere dynamics
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Advanced Optical Sensing Technologies
- Astro and Planetary Science
- Dust and Plasma Wave Phenomena
- Particle Detector Development and Performance
- Advanced Data Storage Technologies
- Laser Material Processing Techniques
- Advanced Fiber Laser Technologies
- Pulsed Power Technology Applications
- Ion-surface interactions and analysis
- High-Energy Particle Collisions Research
Ludwig-Maximilians-Universität München
2013-2023
Marvel Fusion
2023
LMU Klinikum
2021
Campbell Collaboration
2020
European Organization for Nuclear Research
2016
Max Planck Institute for Plasma Physics
2016
Maxim Integrated (Germany)
2010
Ruhr University Bochum
1989-2008
General Atomics (United States)
2002-2006
University of Nevada, Reno
2003-2006
The concept of fast ignition with inertial confinement fusion (ICF) is a way to reduce the energy required for and burn maximize gain produced by single implosion. Based on recent experimental findings at PETAWATT laser Lawrence Livermore National Laboratory, an intense proton beam achieve proposed. It direct acceleration focused onto pellet from rear side irradiated target can be integrated into hohlraum indirect drive ICF.
A new technique is described for the isochoric heating (i.e., at constant volume) of matter to high energy-density plasma states (>10(5) J/g) on a picosecond time scale (10(-12)sec). An intense, collimated, ultrashort-pulse beam protons--generated by high-intensity laser pulse--is used isochorically heat solid density material temperature several eV. The duration shorter than significant hydrodynamic expansion occur; hence heated warm dense state. Using spherically shaped targets, focused...
The laminarity of high-current multi-MeV proton beams produced by irradiating thin metallic foils with ultraintense lasers has been measured. For energies >10 MeV, the transverse and longitudinal emittance are, respectively, <0.004 mm mrad <10(-4) eV s, i.e., at least 100-fold may be as much 10(4)-fold better than conventional accelerator beams. fast acceleration being electrostatic from an initially cold surface, only collisions accelerating electrons appear to limit beam laminarity. ion...
Due to their particular properties, the beams of multi-MeV protons generated during interaction ultraintense (I&gt;1019 W/cm2) short pulses with thin solid targets are most suited for use as a particle probe in laser-plasma experiments. The recently developed proton imaging technique employs point-projection scheme diagnostic tool detection electric fields In recent investigations carried out at Rutherford Appleton Laboratory (RAL, UK), wide range conditions relevance inertial...
The results of Monte-Carlo simulations electron-positron-photon cascades initiated by slow electrons in circularly polarized fields ultra-high strength are presented and discussed. Our confirm previous qualitative estimations [A.M. Fedotov, et al., PRL 105, 080402 (2010)] the formation cascades. This sort has revealed new property restoration energy dynamical quantum parameter due to acceleration positrons field may become a dominating feature laser-matter interactions at intensities....
Recently, much attention has been attracted to the problem of limitations on attainable intensity high power lasers [A. M. Fedotov et al., Phys. Rev. Lett. 105, 080402 (2010)]. The laser energy can be absorbed by electron-positron pair plasma produced from a seed strong field via development electromagnetic cascades. numerical model for self-consistent study dynamics is developed. Strong absorption in self-generated overdense demonstrated. It shown that becomes important not extremely...
High energy particle accelerators have been crucial in providing a deeper understanding of fundamental particles and the forces that govern their interactions. In order to increase or reduce size accelerator, new acceleration schemes need be developed. Plasma wakefield acceleration, which electrons plasma are excited, leading strong electric fields, is one such promising novel technique. Pioneering experiments shown an intense laser pulse electron bunch traversing plasma, drives fields 10s...
The generation of high energy protons from the interaction a short laser pulse with dense plasma, accompanied by preformed low density has been studied particle-in-cell simulations. proton acceleration toward direction in plasma is characterized time-dependent model and peak given. effect electron recirculation on rear side sheath discussed it found that increases inverse proportion to target thickness. These results shed light dependence intensity, length, Finally optimal parameters for...
The interaction of short-pulse high-intensity lasers with solid targets generates large numbers energetic electrons. electrons can only penetrate into the if supply an equivalent charge-neutralizing return current. We develop a simple model which shows that in many cases cannot support required current and fast are confined by electric fields to surface target. target response laser irradiation depends strongly on electrical conductivity solid.
A novel physical phenomenon has been observed following the interaction of an intense (10(19) W/cm(2)) laser pulse with underdense plasma. Long-lived, macroscopic bubblelike structures have detected through deflection that associated electric charge separation causes in a proton probe beam. These are interpreted as remnants cloud relativistic solitons generated plasma by ultraintense pulse. This interpretation is supported analytical study soliton evolution, particle-in-cell simulations, and...
Proton imaging is a recently proposed technique for diagnosis of dense plasmas, which favourably exploits the properties protons produced by high-intensity laser-matter interaction. The allows distribution electric fields in plasmas and around laser-irradiated targets to be explored first time with high temporal spatial resolution. This leads possibility investigating as yet unexplored physical issues. In particular we will present measurements transient laser-plasmas under various...
The laser light propagation inside the conical target had been studied by three-dimensional particle-in-cell simulations. It is found that optically guided and focused at tip of cone. intensity increases up to several tens times in a micron focal spot. convergence hot electrons head cone observed as consequence surface electron flow self-generated quasistatic magnetic fields electrostatic sheath fields. As result, density locally ten greater than case using normal flat foil.
The Advanced Proton Driven Plasma Wakefield Acceleration Experiment (AWAKE) aims at studying plasma wakefield generation and electron acceleration driven by proton bunches. It is a proof-of-principle R&D experiment CERN the world׳s first experiment. AWAKE will be installed in former CNGS facility uses 400 GeV/c beam bunches from SPS. experiments focus on self-modulation instability of long (rms ~12 cm) bunch plasma. These are planned for end 2016. Later, 2017/2018, low energy (~15 MeV)...
An intense laser pulse focused onto a plasma can excite nonlinear waves. Under appropriate conditions, electrons from the background are trapped in wave and accelerated to ultra-relativistic velocities. This scheme is called wakefield accelerator. In this work, we present results acceleration experiment using petawatt-class wakefields as well nanoparticles assist injection of into accelerating phase wakefields. We find that 10-cm-long, nanoparticle-assisted accelerator generate 340 pC, 10 ±...
The evolution of laser-generated MeV, MA electron beams propagating through conductors and insulators has been studied by comparing measurement modeling the distribution MeV protons that are sheath accelerated propagated electrons. We find flow metals is uniform can be laser imprinted, whereas propagation induces spatial disruption fast Agreement found with material dependent modeling.
An electromagnetic pair-creation cascade seeded by an electron or a photon in intense plane wave interacts complicated way with the external field. Many simulations neglect vector nature of photons including their interaction using unpolarised cross-sections. After deriving rates for tree-level processes nonlinear Compton scattering and pair creation arbitrary linearly-polarised constant-crossed field, we present results numerical that include photon's nature. The seed electrons rotating...
We isolate the two-step mechanism involving a real intermediate photon from one-step virtual for trident process in constant crossed field. The is shown to agree with an integration over polarized subprocesses. At low moderate quantum nonlinearity parameter, found be suppressed. When parameter large, two decay channels are comparable if field dimensions not much greater than formation length.
New acceleration technology is mandatory for the future elucidation of fundamental particles and their interactions. A promising approach to exploit properties plasmas. Past research has focused on creating large-amplitude plasma waves by injecting an intense laser pulse or electron bunch into plasma. However, maximum energy gain electrons accelerated in a single stage limited driver. Proton bunches are most drivers wakefields accelerate TeV scale stage. An experimental program at CERN—the...
Reflecting light from a mirror moving close to the speed of has been envisioned as route towards producing bright X-ray pulses since Einstein's seminal work on special relativity. For an ideal relativistic mirror, peak power reflected radiation can substantially exceed that incident due increase in photon energy and accompanying temporal compression. Here we demonstrate for first time dense electron mirrors be created interaction high-intensity laser pulse with freestanding, nanometre-scale...
We give direct experimental evidence for the observation of full transverse self-modulation a long, relativistic proton bunch propagating through dense plasma. The exits plasma with periodic density modulation resulting from radial wakefield effects. show that is seeded by ionization front created using an intense laser pulse copropagating bunch. extends over length following seed point. By varying one order magnitude, we frequency scales expected dependence on density, i.e., it equal to...
The seeded self-modulation of a relativistic, charged particle bunch in plasma is shown to grow both along the and plasma, resulting transverse wakefield amplitudes that far exceed initial seed values.