553 research outputs found
Study of the Azimuthal Cracks in the Electromagnetic Calorimeter: the Electron and Positron Case
No full textThe present study complements two former notes which were devoted to the study of photons in the azimuthal and polar cracks. We show that the effects of cracks on the measured energy can be substancially reduced by applying sets of correction factors which are dependent on the incident energy. The physics case of a generic Z decaying to e+ e- is addressed
About the Electromagnetic Shower lateral Profile in the Lead Tungstate
No full textA comparison between test beam data and simulation provides an indirect measurement of the electron shower width in PbWO4 crystals. The results is compared with the Moliere radius approximation
Meeting of Directors and Heads of Department from CEA-Saclay, France
No full textDirectors and Heads of Department from the Saclay centre of the French atomic energy commission (CEA) visited CERN in December. They are pictured here at the LHC magnet test facility in building SM18. On the left behind the visitors are the test benches where magnets are prepared for installation in String 2: the 120-metre full-scale model of an LHC cell of the regular part of the arc, which can be seen to the right. Photos 01, 02: Left to right: Marc Dejardin, Alain Givernaud, Louis Laurent, François Kircher, Antoine Masurel, Joël Feltesse, André Menez, T. Taylor, Philippe Pradelles, Bernard Sevestre, Michel Roche, Jean-Yves Gascoin, Thierry Lieven, Michel Spiro, Jean-Pierre Pervès, Yves Lemoigne, Béatrice Reder, Georges Carola, Philippe Lebrun, Yves Bourlat, Bertrand Mercier, Jean-Paul Langlois, Patrick Laurent, Didier Moulin, Xavier Vitart, Marc Serre, Jean-Louis Pierrey, Patrick Jarry, Bruno Mansoulié, Stéphane Lequien, Hervé Barbelin, Philippe Pallier, Jean-Yves Guillamot, and Norbert Sioegel
Study of the Polar Cracks in the Electromagnetic Calorimeter : the Photon Case
No full textThe study of the polar cracks in the electromagnetic calorimeter complements a former note which was devoted to the study of the azimuthal cracks. We show that the effects of cracks on the measured energy can be substancially reduced by applying a correction factor which is roughly independent of the incident energy. The physics case of a 100 GeV Higgs decaying to 2 photons is addressed
CPW self-resetting power limiting devices based on microwave power induced semiconductor-metal transition in vanadium dioxide
No full textInternational audienceWe present a novel concept of microwave power limiting devices (reversible self-resetting fuses and power limiters) based on reversible semiconductor-to-metal transition (SMT) of vanadium dioxide thin films integrated on coplanar waveguide transmission lines (CPW). We designed, simulated and fabricated devices which can be reversibly driven from a low-loss (<0.7 dB) transmission state into a high-loss state (attenuation higher than 32 dB from 100 MHz to 40 GHz) as the VO2 material is changing from semiconductor to metal when the incident microwave power exceed a threshold value. These simple devices can be easily integrated as broadband protection circuits from excess power or DC transients for a large variety of RF and microwave component
RF microwave switches based on reversible metal semiconductor transition properties of VO2 thin films : an attractive way to realise simple RF microelectronic devices
No full textISBN : 978-1-60511-101-8International audienceMicrowave switches in both shunt and series configurations have been developed using the semiconductor to metal (SC-M) transition of vanadium dioxide (VO2) thin films deposited by in situ pulsed laser deposition on C-plane sapphire and SiO2/Si Substrates. The influence of geometrical parameters such as the length of the switch is shown. The VO2-based switches exhibit up to 30-40 dB average isolation of the radio-frequency (RF) signal over a very wide frequency band (500 MHz-35 GHz) with weak insertion losses, when thermally activated. Furthermore, they can be electrically activated. Finally, these VO2-based switches are integrated in the fabrication of innovative tunable band-stop filters which consist of a transmission line coupled with four U-shaped resonators and operate in the 9-11 GHz frequency range. Its tunability is demonstrated using electrical activation of each VO2-based switch
- …
