Mohamed El Khaldi
A5040117510- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Electrostatic Discharge in Electronics
- Pulsed Power Technology Applications
- Optical Network Technologies
- Ionosphere and magnetosphere dynamics
- Advanced X-ray Imaging Techniques
- Advanced X-ray and CT Imaging
- Radio Frequency Integrated Circuit Design
- Antenna Design and Optimization
- Laser-Plasma Interactions and Diagnostics
- Microwave Engineering and Waveguides
- Antenna Design and Analysis
- Advanced optical system design
- Photocathodes and Microchannel Plates
- Plasma Diagnostics and Applications
- UAV Applications and Optimization
- Smart Agriculture and AI
- Phase-change materials and chalcogenides
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2018-2025
University of Balamand
2024
Centre National de la Recherche Scientifique
2003-2024
Université Paris-Saclay
2024
Institut National de Physique Nucléaire et de Physique des Particules
2024
GANIL
2015-2019
Université Paris-Sud
2013
Ghent University Hospital
2012
CEA Cadarache
2008-2011
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2008-2011
ThomX is a new generation Compact Compton Source. It currently commissioned by and at the IJCLab (Laboratoire de physique des 2 infinis - Irène Joliot-Curie (UMR9012)) Orsay. The first beam expected begining of 2021. aim to demonstrate characteristics an intense (lab-size) X-ray source based on Scattering. performances are mostly driven laser optical system which above state art stored power. Proof principle various techniques will be performed thanks versatile beamline. Firstly, this...
ThomX is a compact x-ray source based on Compton scattering, installed at IJCLab (Laboratoire de physique des 2 infinis-Irène Joliot-Curie) in Orsay. The machine uses small electron storage ring and an intense laser pulse stored high-finesse optical cavity. This article describes the various subsystems of their initial results commissioning, which began mid-2021. first commissioning phase led to production <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"...
In the framework of ion cyclotron resonance frequency heating development at CEA Cadarache, a prototype antenna based on load-resilient electrical layout foreseen for ITER has been built. This was recently tested in Tore Supra. The ITER-like scheme validated during fast perturbations edge plasma. Clear load resilience properties are reported. main conclusions and consequences learned from discussed.
LAL is now equiped with its own platform for photoinjectors tests and Research Developement, named PHIL (PHotoInjectors at LAL). This facility has two main purposes: push the limits of performances working on both design associated technology provide a low energy (MeV) short pulses (ps) electron beam interested users. Another very important goal this machine will be to an opportunity form accelerator physics students, in high environment. To achieve test line was realised equipped RF source,...
Tore Supra routinely addresses the physics and technology of very long-duration plasma discharges, thus bringing precious information on critical issues long pulse operation ITER. A new ITER relevant lower hybrid current drive (LHCD) launcher has allowed coupling to a power level 2.7 MW for 78 s, corresponding density close design value foreseen an LHCD system. In accordance with expectations, distance (10 cm) been obtained. Successive stationary states profile have controlled in real-time...
A collaboration of seven research institutes and an industry has been set up for the ThomX project, a compact Compton Backscattering Source (CBS) based in Orsay – France. After period study definition machine performance, full description all systems provided. The infrastructure work started main are call tender phase. In this paper we will illustrate definitive parameters components characteristics. We also update results different technical experimental activities on optical resonators, RF...
Abstract This paper presents an optically controlled broadband phase‐shifter using a parallel‐line coupler, that takes advantage of high‐resistivity silicon photo‐absorption at 840 nm. A continuously variable phase‐shifting 120° is achieved 11 GHz with Δ| S 21 | < 5 dB and −15 in large frequency band (6–15 GHz). © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 570–573, 2005; Published online InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21232
Two optically controlled phase shifters are proposed. The first structure is based on the microstrip ring resonator inserted between two gaps. Phase-shifting performed by controlling gaps capacitance. has shown excellent characteristics, however rejection rate high. To minimise reflected power, second shifter, which rat race coupler, In this case, phase-shifting adding extra lengths to gaps, judiciously placed along microwave ports. act as short-circuits under sufficient illumination...
An optically controlled phase-shifter has been designed taking benefit of high resistive silicon photo-absorption at 843 nm. Phase-shift 85/spl deg/ achieved in the frequency range 18 GHz-28 GHz under very low optical power while magnitude remains practically constant. Physical and electromagnetic modelling performed to explain microwave effects these microstrip structures.
Abstract The optically controlled phase and magnitude of a coplanar transmitted wave have been investigated, taking advantage the benefit silicon photo‐absorption at 843 nm. A phase‐shift 45° has achieved 12 GHz while remains constant. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 129–132, 2003; Published online in InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10993
ThomX Compton light source is designed to maximise the average X-ray flux providing a compact and tunable machine which can operate in hospitals or museums. These constraints impose choice of high collision rate based on S-band Linac whose energy 50-70 MeV combined an electron storage ring. As most performances beam at interaction point depend quality ring entrance, linear accelerator must be carefully especially photo-injector. Simulations have been carried out order optimise emittance for...
The antenna scattering (S‐matrix) or impedance matrix at location where the is connected to power system of crucial importance assess compliance with handling requirements and design tuning‐and‐matching system. electrical behaviour an Ion Cyclotron Resonance Heating (ICRH) ITER in front infinite isotropic load was assessed numerically using HFSSR TOPICA codes for comparison. calculations were performed 45 MHz, various thicknesses vacuum layer, relative permittivities ε′ dielectric medium...
Photocathode RF guns are used in the first stage of electron beam generation and acceleration. The gun THOMX is a 2.5 cell standing wave copper cavity with resonance frequency 2998.55 MHz at 30 °C under vacuum. metal photocathode such as or magnesium inserted into backplane cavity. Due to high repetition rates up 50 Hz average dissipated power internal surfaces 1.5 kW, causing heating deformation shape. Therefore, cooling system device has be well designed take control deformations...
We propose here to apply the technique of optical control microwave devices perform phase-shifting for microstrip phased arrays. The physical principle used is photoconductive effect which enables creation a variable load, when gap in line illuminated with an signal adequate wavelength. This applied on hybrid ring. have designed phase-shifter continuously varying phase and quasi-constant |S<sub>21</sub>|, few return losses. measurements given interesting results. A low cost small size array...
Arc detection systems are developed for ICRH on ITER to prevent arcs from damaging the RF components. One of detectors, Sub‐Harmonic Detector (SHAD) is based frequencies emitted in MHz range by [R1]. To ensure high level reliability required this safety system, it necessary demonstrate that these present a signal with Signal Noise Ratio enough be detected under wide operational conditions (frequency, power, configuration) and different types can appear feeding lines antennas (vacuum arc,...
The upgraded 3.7 GHz Lower Hybrid Current Drive (LHCD) system for the Tore Supra (TS) tokamak is in process of installation [1]. When complete, it will permit long pulse injection (1000s) at coupled power level up to 6, 5 MW. Steady state operation high RF sources and components challenging requires careful validation before can be commissioned on tokamak.Results CW klystrons, improvements forming part generation circuit development an water load sustain pulses under 700 kW are presented.