F. Friebel
A5082428905- Laser-Plasma Interactions and Diagnostics
- Solid State Laser Technologies
- Laser Design and Applications
- Particle Accelerators and Free-Electron Lasers
- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Magnetic confinement fusion research
- Particle Detector Development and Performance
- Optical Systems and Laser Technology
- Particle accelerators and beam dynamics
- Photorefractive and Nonlinear Optics
- Photocathodes and Microchannel Plates
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- bioluminescence and chemiluminescence research
- Superconducting Materials and Applications
- Particle physics theoretical and experimental studies
- Atomic and Molecular Physics
- Gyrotron and Vacuum Electronics Research
- Radiation Therapy and Dosimetry
- Radiation Detection and Scintillator Technologies
- Laser-induced spectroscopy and plasma
- Photonic and Optical Devices
- Optical Coatings and Gratings
- Plasma and Flow Control in Aerodynamics
FHNW University of Applied Sciences and Arts
2022
European Organization for Nuclear Research
2016-2021
Campbell Collaboration
2020
Max Planck Institute for Physics
2016-2019
Max Planck Society
2019
Google (United States)
2019
Laboratoire Charles Fabry
2009-2014
Centre National de la Recherche Scientifique
2009-2013
University of Applied Sciences Emden Leer
2011
Université Paris-Sud
2009
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 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)...
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.
AWAKE is a proton-driven plasma wakefield acceleration experiment. % We show that the experimental setup briefly described here ready for systematic study of seeded self-modulation 400\,GeV proton bunch in 10\,m-long rubidium with density adjustable from 1 to 10$\times10^{14}$\,cm$^{-3}$. short laser pulse used ionization vapor propagates all way along column, suggesting full vapor. occurs bunch, at time and follows affects bunch.
We demonstrate the generation of 99 fs pulses by a mode-locked laser oscillator built around Yb:CaF(2) crystal. An average power 380 mW for 13 nm bandwidth spectrum centered at 1053 is obtained. The short-pulse operation achieved thanks to saturable absorber mirror and stabilized Kerr lens effect. investigated limits stabilization process observed regime slowly oscillating between mode locking Q switching.
We use a relativistic ionization front to provide various initial transverse wakefield amplitudes for the self-modulation of long proton bunch in plasma. show experimentally that, with sufficient amplitude [$\ensuremath{\ge}(4.1\ifmmode\pm\else\textpm\fi{}0.4)\text{ }\text{ }\mathrm{MV}/\mathrm{m}$], phase modulation along is reproducible from event event, 3%--7% (of $2\ensuremath{\pi}$) rms variations all bunch. The not lower amplitudes. observe transition between these two regimes. Phase...
The AWAKE collaboration prepares a proton driven plasma wakefield acceleration experiment using the SPS beam at CERN. A long bunch extracted from interacts with high power laser and 10 m rubidium vapor cell to create strong wakefields allowing sustained electron acceleration. probe these is created by an accelerator consisting of rf-gun booster structure. This source should provide beams intensities between 0.1 1 nC, lengths 0.3 3 ps emittance order 2 mm mrad. structure accelerate electrons...
A compact and robust, dual-crystal cross polarized wave generation setup combined with a hollow waveguide filter is implemented to deliver few-cycle, high-contrast laser pulses sourced from commercial multipass Ti:Sa amplifier. The initial 25-fs temporal contrast of 108 are shortened 10 fs an improved at least 1010. single nonlinear stage for spectral broadening enhancement amplifier serves as ideal injector petawatt-class systems.
We present the research advances on development of 50-200 mJ energy range diode-pumped Yb:CaF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -based multipass amplifiers operating at relatively high repetition rates. These laser are based diverse innovative geometries. All these innovations aim to design compact, stable, and reliable adapted our application that consists in pumping ultrashort-pulse optical parametric chirped pulse...
We study experimentally the longitudinal and transverse wakefields driven by a highly relativistic proton bunch during self-modulation in plasma. show that wakefields' growth amplitude increase with increasing seed as well charge using maximum radius of distribution measured on screen downstream from externally injecting electrons measuring their final energy. Measurements agree trends predicted theory numerical simulations validate our understanding development self-modulation. Experiments...
Abstract In 2017, AWAKE demonstrated the seeded self-modulation (SSM) of a 400 GeV proton beam from Super Proton Synchrotron at CERN. The angular distribution protons deflected due to SSM is quantitative measure process, which agrees with simulations by two-dimensional (axisymmetric) particle-in-cell code LCODE about 5%. agreement achieved in population scans two selected plasma densities and scan longitudinal density gradient. reached only case wide enough simulation box (several...
In this article, we briefly summarize the experiments performed during first Run of Advanced Wakefield Experiment, AWAKE, at CERN (European Organization for Nuclear Research). The final goal AWAKE 1 (2013 - 2018) was to demonstrate that \unit[10-20]{MeV} electrons can be accelerated GeV-energies in a plasma wakefield driven by highly-relativistic self-modulated proton bunch. We describe experiment, outline measurement concept and present results. Last, our plans future.
We study experimentally the effect of linear plasma density gradients on self-modulation a 400\,GeV proton bunch. Results show that positive/negative gradient in/decreases number micro-bunches and relative charge per micro-bunch observed after 10\,m plasma. The measured modulation frequency also in/decreases. With largest positive we observe two frequencies in power spectrum. are consistent with changes wakefields' phase velocity due to adding slow during growth predicted by theory.
We study the propagation of 0.05-1 TW power, ultrafast laser pulses in a 10 meter long rubidium vapor cell. The central wavelength is resonant with $D_2$ line and peak intensity $10^{12}-10^{14} ~W/cm^2$ range, enough to create plasma channel single electron ionization. observe absorption pulse for low energy, regime transverse confinement beam by strong nonlinearity higher energies broadening output when saturated due full medium compare experimental observations transmitted energy fluence...
Plasma wakefield dynamics over timescales up to 800 ps, approximately 100 plasma periods, are studied experimentally at the Advanced Wakefield Experiment (AWAKE). The development of longitudinal amplitude driven by a self-modulated proton bunch is measured using external injection witness electrons that sample fields. In simulation, resonant excitation causes electron trajectory crossing, resulting in potential outside boundary as transversely ejected. Trends consistent with presence this...
In this paper, we present a diode-pumped multipass amplifier based on Yb:CaF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> using passive coherent combining in order to access the 100 mJ range without optical damage.
In 2017, AWAKE demonstrated the seeded self-modulation (SSM) of a 400 GeV proton beam from Super Proton Synchrotron (SPS) at CERN. The angular distribution protons deflected due to SSM is quantitative measure process, which agrees with simulations by two-dimensional (axisymmetric) particle-in-cell code LCODE. Agreement achieved for populations between $10^{11}$ and $3 \times 10^{11}$ particles, various plasma density gradients ($-20 \div 20\%$) two densities ($2\times 10^{14} \text{cm}^{-3}$...