A5051731853- Pulsed Power Technology Applications
- Gyrotron and Vacuum Electronics Research
- Laser Design and Applications
- Electrostatic Discharge in Electronics
- Integrated Circuits and Semiconductor Failure Analysis
- Microwave Engineering and Waveguides
- Silicon Carbide Semiconductor Technologies
- Particle Accelerators and Free-Electron Lasers
- Electromagnetic Launch and Propulsion Technology
- Particle accelerators and beam dynamics
- Antenna Design and Analysis
- Ultra-Wideband Communications Technology
- Solid State Laser Technologies
- Energy Harvesting in Wireless Networks
- Luminescence Properties of Advanced Materials
- Microbial Inactivation Methods
- Advanced Measurement and Detection Methods
- Laser-Plasma Interactions and Diagnostics
- Microwave Imaging and Scattering Analysis
- Electron and X-Ray Spectroscopy Techniques
- Electromagnetic Compatibility and Measurements
- Advancements in Photolithography Techniques
- Particle Detector Development and Performance
- Advanced Optical Sensing Technologies
- Cellular and Composite Structures
Centre d'Études Scientifiques et Techniques d'Aquitaine
2015-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2013-2024
Université de Pau et des Pays de l'Adour
2008-2010
Laboratoire de Génie Électrique et Électronique de Paris
2008-2009
Recent works have extended the feasibility of a broadband device for electromagnetic radiations. This consists high-gain antenna driven by compact, self-contained and voltage-adjustable generator (Mayes et al., 2001). With this other applications in mind, authors pursued program to develop characterise repetitive, high voltage, nanosecond rise-time Marx generator. It was designed, built successfully tested. Experiments were planned reach rise-time, voltage level around 200 kV few tens Hertz...
This paper explains the design and production of two autonomous ultrawideband (UWB) radiation sources. These sources consist a high-gain broadband antenna that is driven by one subnanosecond pulsed power Each source made up Marx generator pulse-forming device based on use gaseous spark gap. The first combines four-stage 200-kV/34-J with coaxial line. Its main characteristics are an output voltage 100 kV, 250-ps rise time, pulse duration, repetition rate about 40 Hz. second ten-stage delivers...
This paper presents the design and experimental results of a hand-portable, self-contained, repetitive radiation source high-power ultrawideband (UWB) pulses. consists deployed UWB antenna driven by high-pulsed power (HPP) generator powered self-contained 50-kV rapid charger at repetition rates up to 100 Hz. By changing HPP generator, two different electric wave shapes with frequency spectra can be generated. Each is based on use Marx generator. On one hand, 200-kV/1.4-J associated coaxial...
This paper investigates the ability of a syntactic epoxy foam and an expanded polyurethane to mitigate intense (several GPa) short duration (T < 1 µs) stress waves. Plate impact electron beam irradiation experiments have been conducted study their dynamic mechanical responses. Interferometer Doppler Laser method is used record target rear surface velocity. A two-wave structure associated with propagation elastic precursor compaction pores has observed. The level deduced from velocity...
The evolution of two intense pulsed electron beams for an x-ray flash radiography application is characterized in a coupling experimental and simulation studies. For this purpose, experiments were performed at Commissariat \`a l'Energie Atomique et aux Energies Alternatives with new dual-pulse inductive voltage adder named ``Mi2.'' This setup has been designed built to produce 2 kA, 700 keV, 80 ns full width half maximum from velvet cold cathode. delay between the pulses ranges tens...
This paper presents the design, fabrication, and characterization of a compact wideband antenna for high-power microwave applications. The antennas proposed are array patches with high compactness less than λ/10 thick. concept developed can be fed by high-voltage signals (up to 60 kV) in repetitive operation. Two designs produced at central frequencies 350 MHz 1 GHz. Their relative bandwidth is larger 40% 25% GHz S11 <; - 10 dB, respectively. arrays studied produce gain more 14 dB.
Traditional uses of the Marx generator have been limited to energy storage and delivering systems, such as charging capacitors or pulse forming lines. However, low energy, compact, high peak power generators can be used repetitive drivers for many applications. This paper presents design, realisation experimental tests a auto-triggered expected driver broadband radiation system. whole system consists pulsed source, i.e. line charged by bank an UWB antenna array. Design were planned reach...
The intention of this paper is to present the instantaneous electromagnetic field measurement by signature a neutral object (MICHELSON) method. MICHELSON method relatively new and enables high-level fields from utilization target. incident scattering on target allows us move location where scattered can then be measured using simple equipment without breakdown risk. This does away with necessity for cables in test zone. When small targets, induced disturbances are limited. implemented...
The development of an autonomous, repetitive, pulsed power generator is presented. This work a coordinate effort between CEA, Pau University and Technix to develop tightly integrated unit, including battery pack, intermediate dc/dc converter, high voltage the control system PRF Marx generator. has designed They have built 170 mm diameter, 330 length capable delivering 200 kV pulses into 50 Ω impedance with tens nanosecond rise times 100 Hz repetition rate, enabling it drive pulse forming...
We present in this paper the design and realisation of two autonomous, ultra wideband radiation sources consisting a high gain broadband antenna driven by subnanosecond pulsed power sources.Each one is made Marx generator pulse forming device based on use gaseous spark gap.The main source ten stage which delivers pulses range 250 kV/1.5 J, with 300 ps rise time, duration at repetition frequency 350 Hz.The combined travelling wave called Valentine antenna.Some mechanical modifications were to...
CEA is working on a solid state pulse modulator to drive an electron gun, source of RF accelerator. The application requires square pulses in the range 140kV (1% flat top), 10A, 150μs width, at repetition rate 50Hz and reproducibility pulse-to-pulse better than 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−3</sup> . This based Marx topology which employs standard 1700V IGBTs diodes control charge, discharge isolation cells. particular...
During the two last decades, several countries have carried out works to upgrade radiographic electron generators used for hydrodynamics experiments. These studies require small X-ray spot sizes (~ 2mm), associated with very high dose rates 5.10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">9</sup> rad/s). goals been successfully obtained on facilities like AIRIX xmlns:xlink="http://www.w3.org/1999/xlink">1</sup> , DARHT...