A5102961302- Laser-Plasma Interactions and Diagnostics
- Advanced Optical Sensing Technologies
- Laser-Matter Interactions and Applications
- Laser Design and Applications
- Atomic and Molecular Physics
- Integrated Circuits and Semiconductor Failure Analysis
- Photonic and Optical Devices
- Pulsed Power Technology Applications
- Radiation Effects in Electronics
- Laser Material Processing Techniques
- Radiation Detection and Scintillator Technologies
- Laser-induced spectroscopy and plasma
- Advanced Fiber Laser Technologies
- Nuclear Physics and Applications
- Photocathodes and Microchannel Plates
- Advanced Fiber Optic Sensors
- Magneto-Optical Properties and Applications
- Electrostatic Discharge in Electronics
- Spectroscopy and Laser Applications
- Quantum optics and atomic interactions
- Surface Roughness and Optical Measurements
- Advanced X-ray Imaging Techniques
- Atomic and Subatomic Physics Research
- Nonlinear Optical Materials Research
- Optical Coatings and Gratings
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2009-2024
CEA Gramat
2016-2024
CEA DAM Île-de-France
2002-2014
Laboratoire d'Optique Appliquée
2005-2006
Gesellschaft für Elektrometallurgie (Germany)
2003
Polytechnique Montréal
1994
Physique des interactions ioniques et moléculaires
1985
We present the first direct measurement of time evolution gain a soft x-ray laser amplifier. The is based on injection seed pulse, obtained by high-order harmonic generation, into an medium. Strong amplification occurs when pulse synchronized with period. By precisely varying delay between plasma creation and injection, actual temporal amplifier subpicosecond resolution.
Total ionizing dose (TID) effects induced by different photon sources are studied in MOS devices. The factor (DF), defined as the ratio between deposition dosimeter and actual MOS-sensitive oxides (SOs), is estimated using Monte-Carlo simulations of energetic photons striking simple device structures. An effective TID approach proposed to account for both real depositions small volumes charge yield. This method applied a silicon-on-insulator (SOI) technology three sources: usual ARACOR <sup...
Fiber Bragg gratings (FBGs) are one of the most used optical fiber sensors and they have recently drawn attention several research groups for their potential applications in harsh radiation environments. Up to now, performances been mainly evaluated under ionizing radiations, such as X-rays or γ-rays. We compare here effects different irradiation types, including X-rays, protons, electrons, on type I FBGs written by UV laser exposure Ge-, P/Ce-, B/Ge-doped single-mode fibers. Different...
The total ionizing dose (TID) sensitivity of mature and innovative technologies is investigated using both radiation experiments Monte-Carlo simulations to discuss the potential spectral photon sources as an alternative for effects studies. impact technological test parameters on effective TID deposition also discussed. All layers struck by incident flux before reaching targeted sensitive oxide are major contributors final deposits, rather than actual itself.
Commissariat à l’Énergie Atomique et aux Énergies Alternatives has developed the ARGOS X-ray framing camera to perform two-dimensional, high-timing resolution imaging of an imploding target on French high-power laser facility Laser MegaJoule. The main features this are: a microchannel plate gated detector, spring-loaded CCD that maintains proximity focus in any orientation, and electronics packages provide remotely-selectable high-voltages modify exposure-time camera. These components are...
At CEA Gramat, we operate several facilities for high flux radiation testing. ASTERIX <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[1-4]</sup> is the spearhead of them and allows one shot ultra-intense X-ray flashes generation (up to 2 ·10 xmlns:xlink="http://www.w3.org/1999/xlink">8</sup> Gy[Si]/s at 1 m in less than 50 ns). Recently, a new irradiation facility has come into operation. This additional resource, based on linear electron...
This article aims to quantify the radiation-induced electric responses of coaxial cables while irradiated by a pulsed X-ray flux. First, precise characterization generator was performed using 3-D Maxwell and Monte Carlo numerical simulations. These results were used calculate currents induced X-rays within 2-D transverse electromagnetic codes. A systematic analysis several cable references comparing experimental results. allows for determination gaps at interface between dielectrics...
The impact of exposing an optical fiber to 6-MeV electrons on the performances frequency domain reflectometry (OFDR) distributed sensors is investigated. Six different types fibers with core compositions and coatings have been tested: four are metal coated (copper, gold, or aluminum) for high-temperature >300 °C) operations while two others telecom-grade acrylate operation below 80 °C. Rayleigh signature used perform OFDR sensing remains almost unaffected after electron exposure. Indeed,...
The impact of photon energy spectrum on dose deposition variability is investigated using dosimetry, charge collection experiments electronic and optoelectronic devices, radiation-induced attenuation (RIA) measurements in optical fibers. Geant4 calculations are performed to discuss the influence spectrum, sensitive layer thickness, irradiated material. Implications for radiation test equipment discussed ensure that effective total ionizing (TID) reached devices.
For the first plasma diagnostics to be deployed at Laser Megajoule (LMJ), Commissariat à l'Energie Atomique (CEA) is developing ultrafast x-ray imaging cameras analyze spatial and temporal evolution of laser-plasma interaction parameters. These cameras, which operate in target chamber vacuum, are composed a one-dimensional (1-D) streak or two-dimensional (2-D) gated detector, power supply units, control electronic modules, charge-coupled device (CCD) readout system. In order optimize their...
Electron-caused electromagnetic pulse (ECEMP) is susceptible to occur into constitutive dielectrics of satellites during their mission due natural space ionizing environment. This paper reports the numerical and experimental characterizations fields subsequently generated by electrostatic discharges (ESDs) from analysis resonant cavity modes replacement currents. ESDs are produced when polytetrafluoroethylene (PTFE or Teflon) samples irradiated a 6-MeV electron beam linear accelerator...
The objective of this study is to determine the time and energy-resolved spectrum emitted by X-ray Modular Bremsstrahlung Source (MBS). This characterization based on absorption coefficient measurements through different filters one hand, subsequent comparison with results 3D Maxwell Monte-Carlo calculations other hand. input parameter numerical series evolution electric field in diode generator, which determined from calculations. A conductivity model gap excited high pulsed power delivered...
The complete procedure of measuring and correcting geometric deformations encountered with dynamic streak camera images in the picosecond range is presented discussed. First, we describe experimental setup derived from well known spacing calibration grid method. implemented measurement bench, adapted to time-resolved 1D imaging, notably exhibits a great accuracy repeatability both space time thanks three-axis motorized translation stage programmable delay lines. Second, examine image...
For the first plasma diagnostics to be deployed on Laser Megajoule (LMJ), Commissariat à l'Energie Atomique (CEA) is developing ultra-fast x-ray imaging cameras analyse spatial and temporal evolution of laser-plasma interaction parameters. These cameras, which operate in target chamber vacuum, are composed a one-dimensional streak (1D) or two-dimensional gated (2D) detector, power supply units, control electronic modules, CCD readout system. In order optimize their definition ensure an easy...
The CEA is developing a high energetic laser Facility for large scale investigations on plasma physics. This facility named Laser Megajoule (LMJ) will offer 240 beams and 1.8 MJ pulse energy 3 ns. These impact target at the center of spherical chamber, experiments by means fusion inertial confinement. We describe here prototype insertable Streak camera hard X-ray specifically designed to operate in vacuum (< 5 10<sup>-6</sup> mbar) near chamber. tube based an open modular structure...
This paper explores the second generation soft X-ray laser both numerically and experimentally. Numerical studies have been achieved by successively using two numerical codes. The first code (hydrodynamic code) describes spatio-temporal evolution of plasma while (ray-trace) models amplification propagation seed along amplifier. Preliminary study tends to show that mJ level, fully coherent, with 100 fs in duration is achievable for wavelengths ranging from 30 4 nm, a pump several tens joules...