A5032157159- Particle Accelerators and Free-Electron Lasers
- Spectroscopy and Laser Applications
- Advanced X-ray Imaging Techniques
- Particle accelerators and beam dynamics
- Advanced Chemical Physics Studies
- Laser-Plasma Interactions and Diagnostics
- Combustion and flame dynamics
- Gyrotron and Vacuum Electronics Research
- Advanced Combustion Engine Technologies
- Atmospheric Ozone and Climate
- Molecular Spectroscopy and Structure
- Laser Design and Applications
- Magnetic confinement fusion research
- Laser-induced spectroscopy and plasma
- Terahertz technology and applications
- Advanced Electron Microscopy Techniques and Applications
- History, Culture, and Society
- Optical Systems and Laser Technology
- Nuclear Physics and Applications
- Political Theology and Sovereignty
- Microwave-Assisted Synthesis and Applications
- Atmospheric and Environmental Gas Dynamics
- High-Temperature Coating Behaviors
- Solid-state spectroscopy and crystallography
- Photocathodes and Microchannel Plates
Université Paris-Saclay
2020-2021
Office National d'Études et de Recherches Aérospatiales
2020
European Organization for Nuclear Research
2019
Université Paris-Sud
2013-2016
Centre National de la Recherche Scientifique
2013-2016
GANIL
2016
Synchrotron soleil
2010-2015
Universidade Estadual de Campinas (UNICAMP)
2014
We have used coherent Smith-Purcell radiation (cSPr) in order to determine the temporal profile of sub-ps long electron bunches at Facility for Advanced Accelerator Experimental Tests, SLAC. The measurements reported here were carried out June 2012 and April 2013. rms values bunch length varied between 356 604 fs, depending on accelerator settings. resolution system was limited by range detectable wavelengths which was, turn, determined choice grating periods these experiments achievable...
The intense Coherent Synchrotron Radiation emitted in the Terahertz range by relativistic electron bunches circulating a storage ring is an attractive source for spectroscopy. Its stability related to bunch dynamics, and can exhibit bursting behavior resulting from irregular presence of micro-structures bunch. We evidence here existence two thresholds spatio-temporal associated with different levels signal fluctuations, increasing number electrons. first threshold indicates drifting profile,...
We present the first high resolution (10−3 cm−1) interferometric measurements in 200–750 GHz range using coherent synchrotron radiation, achieved with a low momentum compaction factor. The effect of microbunching on spectra is shown, depending bunch current. A signal-to-noise ratio reached thanks to an artifact correction system based double detection scheme. Combined broad emitted spectral and flux (up 105 times incoherent radiation), this study demonstrates that radiation can now be used...
Single shot hybrid fs/ps-CARS spectroscopy of N 2 is demonstrated at repetition rate up to 5 kHz using an amplified probe delivering a constant energy per pulse between 1 and kHz. We performed CARS thermometry in laminar CH 4 /air flame ambient air, with precision under 0.5% typical temperature, which times more precise faster than previous state the art this technique. Temperature was measured during long acquisition 100 s, making system suitable record signals 0.01-2500 Hz spectral window;...
Abstract The study of complex reactive flows met in aeronautical engines is an experimental challenge that requires the development noninvasive and precise measurement techniques. Coherent anti‐Stokes Raman scattering (CARS) a standard spectroscopic technique used for temperature measurements, which provides unmatched reliability accuracy at high repetition rate thanks to its recent adaptation femtosecond temporal regime. This paper reports first demonstration hybrid fs/ps‐CARS thermometry...
The production of steady-state Coherent Synchrotron Radiation has been recently achieved in SOLEIL synchrotron using low-alpha configurations. Although the increase THz intensity is advantageous for FTIR measurements, signal-to-noise ratio deteriorated by fluctuations and aperiodic noise. However, we demonstrate here possibility to use CSR as a source spectroscopy at high resolution (10−3 cm−1) noise correction system based on double detection. Combined stability optics infrared beamline...
AbstractThe far-infrared (FIR) spectrum (50–600 cm−1) of 1,1-difluoroethane was recorded using the high-resolution infrared AILES beamline at Soleil synchrotron. A ro-vibrational assignment performed on lowest wavenumber, low intensity 181 0 and 171 modes, yielding band centres 224.241903 (10) cm−1 384.252538 (13) cm−1, respectively. total 965 2031 FIR transitions were assigned to fundamentals, Previously measured pure rotational from upper states included into respective fits yield improved...
Measurements of coherent radiation at accelerators typically give the absolute value beam profile Fourier transform but not its phase. Phase reconstruction techniques such as Hilbert or Kramers Kronig are used to recover We report a study performances these methods and how optimize reconstructed profiles.
We present experimental and numerical results on Terahertz coherent synchrotron radiation obtained in the beamline AILES at SOLEIL. Depending storage ring configuration electron bunch current we observed either stable or instable signals.
Recent advances in physics of particles accelerators and lasers have shifted dramatically the expectations bunch length capability to generate electron bunches with specific longitudinal profiles [1,2]. This has stimulated interest analysis spectrum coherent radiation enable profile diagnostics at femtosecond-scale. Spectral Smith-Purcell (cSPr) is particularly relevant as it allows non-invasive cost-effective monitoring profiles. In this paper, recent results observed from E203 experiment...
Measurements of coherent radiation at accelerators typically give the absolute value beam profile Fourier transform but not its phase. Phase reconstruction techniques such as Hilbert or Kramers Kronig are used to recover We report a study performances these methods and how optimize reconstructed profiles.
In storage rings, short electron bunches can produce an intense THz radiation called Coherent Synchrotron Radiation (CSR). The flux of this emission between 250 and 750 GHz is very advantageous for spectroscopy, but intensity fluctuations lead to artifacts in the FTIR spectra and, until now, prevented use CSR high-resolution measurements. At SOLEIL, we found stable conditions which signal-to-noise ratio (S/N) allows measurements at high resolution. Moreover, developed artifact correction...
The E-203 collaboration is testing a device on FACET at SLAC to measure the longitudinal profile of electron bunches using Smith-Purcell radiation. At have an energy 20~GeV and duration few hundred femtoseconds. radiation emitted when charged particle passes close surface metallic grating. We studied stability measurement from pulse resolution depending number gratings used.
An experiment to measure the Coherent Smith-Purcell radiation has been installed in SOLEIL Linac. Its aim is produce a map of emissions several planes and compare it with theoretical predictions. Smith Purcell produced when grating brought close from sufficiently short charged particles beam. The consist two detectors 5 degrees freedom. These can be moved around emission point intensity at different locations. Radiation maps are recorded parasitically by moving during normal linac operations.
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