Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2020 ( 18 )

2019 ( 220 )

2018 ( 286 )

2017 ( 287 )

Custom range...

Search Results: 1 - 10 of 149791 matches for " H. Sandaker "
All listed articles are free for downloading (OA Articles)
Page 1 /149791
Display every page Item
Preliminary results of 3D-DDTC pixel detectors for the ATLAS upgrade
A. La Rosa,M. Boscardin,G. -F. Dalla Betta,G. Darbo,C. Gemme,H. Pernegger,C. Piemonte,M. Povoli,S. Ronchin,A. Zoboli,N. Zorzi,E. Bolle,M. Borri,C. Da Via,S. Dong,S. Fazio,P. Grenier,S. Grinstein,H. Gjersdal,P. Hansson,F. Huegging,P. Jackson,M. Kocian,F. Rivero,O. Rohne,H. Sandaker,K. Sjobak,T. Slavicek,W. Tsung,D. Tsybychev,N. Wermes,C. Young
Physics , 2009,
Abstract: 3D Silicon sensors fabricated at FBK-irst with the Double-side Double Type Column (DDTC) approach and columnar electrodes only partially etched through p-type substrates were tested in laboratory and in a 1.35 Tesla magnetic field with a 180GeV pion beam at CERN SPS. The substrate thickness of the sensors is about 200um, and different column depths are available, with overlaps between junction columns (etched from the front side) and ohmic columns (etched from the back side) in the range from 110um to 150um. The devices under test were bump bonded to the ATLAS Pixel readout chip (FEI3) at SELEX SI (Rome, Italy). We report leakage current and noise measurements, results of functional tests with Am241 gamma-ray sources, charge collection tests with Sr90 beta-source and an overview of preliminary results from the CERN beam test.
Dark Matter and Fundamental Physics with the Cherenkov Telescope Array
M. Doro,J. Conrad,D. Emmanoulopoulos,M. A. Sanchez-Conde,J. A. Barrio,E. Birsin,J. Bolmont,P. Brun,S. Colafrancesco,S. H. Connell,J. L. Contreras,M. K. Daniel,M. Fornasa,M. Gaug,J. F. Glicenstein,A. Gonzalez-Munoz,T. Hassan,D. Horns,A. Jacholkowska,C. Jahn,R. Mazini,N. Mirabal,A. Moralejo,E. Moulin,D. Nieto,J. Ripken,H. Sandaker,U. Schwanke,G. Spengler,A. Stamerra,A. Viana,H. S. Zechlin,S. Zimmer,for the CTA collaboration
Physics , 2012, DOI: 10.1016/j.astropartphys.2012.08.002
Abstract: The Cherenkov Telescope Array (CTA) is a project for a next-generation observatory for very high energy (GeV-TeV) ground-based gamma-ray astronomy, currently in its design phase, and foreseen to be operative a few years from now. Several tens of telescopes of 2-3 different sizes, distributed over a large area, will allow for a sensitivity about a factor 10 better than current instruments such as H.E.S.S, MAGIC and VERITAS, an energy coverage from a few tens of GeV to several tens of TeV, and a field of view of up to 10 deg. In the following study, we investigate the prospects for CTA to study several science questions that influence our current knowledge of fundamental physics. Based on conservative assumptions for the performance of the different CTA telescope configurations, we employ a Monte Carlo based approach to evaluate the prospects for detection. First, we discuss CTA prospects for cold dark matter searches, following different observational strategies: in dwarf satellite galaxies of the Milky Way, in the region close to the Galactic Centre, and in clusters of galaxies. The possible search for spatial signatures, facilitated by the larger field of view of CTA, is also discussed. Next we consider searches for axion-like particles which, besides being possible candidates for dark matter may also explain the unexpectedly low absorption by extragalactic background light of gamma rays from very distant blazars. Simulated light-curves of flaring sources are also used to determine the sensitivity to violations of Lorentz Invariance by detection of the possible delay between the arrival times of photons at different energies. Finally, we mention searches for other exotic physics with CTA.
Prospects for measuring the gravitational free-fall of antihydrogen with emulsion detectors
AEgIS Collaboration,S. Aghion,O. Ahlén,C. Amsler,A. Ariga,T. Ariga,A. S. Belov,G. Bonomi,P. Br?unig,J. Bremer,R. S. Brusa,L. Cabaret,C. Canali,R. Caravita,F. Castelli,G. Cerchiari,S. Cialdi,D. Comparat,G. Consolati,J. H. Derking,S. Di Domizio,L. Di Noto,M. Doser,A. Dudarev,A. Ereditato,R. Ferragut,A. Fontana,P. Genova,M. Giammarchi,A. Gligorova,S. N. Gninenko,S. Haider,J. Harasimovicz,S. D. Hogan,T. Huse,E. Jordan,L. V. J?rgensen,T. Kaltenbacher,J. Kawada,A. Kellerbauer,M. Kimura,A. Knecht,D. Krasnicky,V. Lagomarsino,A. Magnani,S. Mariazzi,V. A. Matveev,F. Moia,G. Nebbia,P. Nédélec,M. K. Oberthaler,N. Pacifico,V. Petrácek,C. Pistillo,F. Prelz,M. Prevedelli,C. Regenfus,C. Riccardi,O. R?hne,A. Rotondi,H. Sandaker,P. Scampoli,A. Sosa,J. Storey,M. A. Subieta Vasquez,M. Spacek,G. Testera,D. Trezzi,R. Vaccarone,C. P. Welsch,S. Zavatarelli
Physics , 2013, DOI: 10.1088/1748-0221/8/08/P08013
Abstract: The main goal of the AEgIS experiment at CERN is to test the weak equivalence principle for antimatter. AEgIS will measure the free-fall of an antihydrogen beam traversing a moir\'e deflectometer. The goal is to determine the gravitational acceleration g for antihydrogen with an initial relative accuracy of 1% by using an emulsion detector combined with a silicon micro-strip detector to measure the time of flight. Nuclear emulsions can measure the annihilation vertex of antihydrogen atoms with a precision of about 1 - 2 microns r.m.s. We present here results for emulsion detectors operated in vacuum using low energy antiprotons from the CERN antiproton decelerator. We compare with Monte Carlo simulations, and discuss the impact on the AEgIS project.
Annihilation of low energy antiprotons in silicon
S. Aghion,O. Ahlén,A. S. Belov,G. Bonomi,P. Br?unig,J. Bremer,R. S. Brusa,G. Burghart,L. Cabaret,M. Caccia,C. Canali,R. Caravita,F. Castelli,G. Cerchiari,S. Cialdi,D. Comparat,G. Consolati,J. H. Derking,S. Di Domizio,L. Di Noto,M. Doser,A. Dudarev,R. Ferragut,A. Fontana,P. Genova,M. Giammarchi,A. Gligorova,S. N. Gninenko,S. Haider,J. Harasimowicz,T. Huse,E. Jordan,L. V. J?rgensen,T. Kaltenbacher,A. Kellerbauer,A. Knecht,D. Krasnicky,V. Lagomarsino,A. Magnani,S. Mariazzi,V. A. Matveev,F. Moia,G. Nebbia,P. Nédélec,N. Pacifico,V. Petrácek,F. Prelz,M. Prevedelli,C. Regenfus,C. Riccardi,O. R?hne,A. Rotondi,H. Sandaker,A. Sosa,M. A. Subieta Vasquez,M. ?pacek,G. Testera,C. P. Welsch,S. Zavatarelli
Physics , 2013,
Abstract: The goal of the AE$\mathrm{\bar{g}}$IS experiment at the Antiproton Decelerator (AD) at CERN, is to measure directly the Earth's gravitational acceleration on antimatter. To achieve this goal, the AE$\mathrm{\bar{g}}$IS collaboration will produce a pulsed, cold (100 mK) antihydrogen beam with a velocity of a few 100 m/s and measure the magnitude of the vertical deflection of the beam from a straight path. The final position of the falling antihydrogen will be detected by a position sensitive detector. This detector will consist of an active silicon part, where the annihilations take place, followed by an emulsion part. Together, they allow to achieve 1$%$ precision on the measurement of $\bar{g}$ with about 600 reconstructed and time tagged annihilations. We present here, to the best of our knowledge, the first direct measurement of antiproton annihilation in a segmented silicon sensor, the first step towards designing a position sensitive silicon detector for the AE$\mathrm{\bar{g}}$IS experiment. We also present a first comparison with Monte Carlo simulations (GEANT4) for antiproton energies below 5 MeV
Test Beam Results of 3D Silicon Pixel Sensors for the ATLAS upgrade
ATLAS 3D Collaboration,P. Grenier,G. Alimonti,M. Barbero,R. Bates,E. Bolle,M. Borri,M. Boscardin,C. Buttar,M. Capua,M. Cavalli-Sforza,M. Cobal,A. Cristofoli,G-F. Dalla Betta,G. Darbo,C. Da Vià,E. Devetak,B. DeWilde,B. Di Girolamo,D. Dobos,K. Einsweiler,D. Esseni,S. Fazio,C. Fleta,J. Freestone,C. Gallrapp,M. Garcia-Sciveres,G. Gariano,C. Gemme,M-P. Giordani,H. Gjersdal,S. Grinstein,T. Hansen,T-E. Hansen,P. Hansson,J. Hasi,K. Helle,M. Hoeferkamp,F. Hügging,P. Jackson,K. Jakobs,J. Kalliopuska,M. Karagounis,C. Kenney,M. K?hler,M. Kocian,A. Kok,S. Kolya,I. Korokolov,V. Kostyukhin,H. Krüger,A. La Rosa,C. H. Lai,N. Lietaer,M. Lozano,A. Mastroberardino,A. Micelli,C. Nellist,A. Oja,V. Oshea,C. Padilla,P. Palestri,S. Parker,U. Parzefall,J. Pater,G. Pellegrini,H. Pernegger,C. Piemonte,S. Pospisil,M. Povoli,S. Roe,O. Rohne,S. Ronchin,A. Rovani,E. Ruscino,H. Sandaker,S. Seidel,L. Selmi,D. Silverstein,K. Sj\ob\aek,T. Slavicek,S. Stapnes,B. Stugu,J. Stupak,D. Su,G. Susinno,R. Thompson,J-W. Tsung,D. Tsybychev,S. J. Watts,N. Wermes,C. Young,N. Zorzi
Physics , 2011, DOI: 10.1016/j.nima.2011.01.181
Abstract: Results on beam tests of 3D silicon pixel sensors aimed at the ATLAS Insertable-B-Layer and High Luminosity LHC (HL-LHC)) upgrades are presented. Measurements include charge collection, tracking efficiency and charge sharing between pixel cells, as a function of track incident angle, and were performed with and without a 1.6 T magnetic field oriented as the ATLAS Inner Detector solenoid field. Sensors were bump bonded to the front-end chip currently used in the ATLAS pixel detector. Full 3D sensors, with electrodes penetrating through the entire wafer thickness and active edge, and double-sided 3D sensors with partially overlapping bias and read-out electrodes were tested and showed comparable performance.
Thin silicon strip detectors for beam monitoring in Micro-beam Radiation Therapy
Marco Povoli,Enver Alagoz,Alberto Bravin,Iwan Cornelius,Elke Br?uer-Krisch,Pauline Fournier,Thor-Erik Hansen,Angela Kok,Michael Lerch,Edouard Monakhov,John Morse,Marco Petasecca,Herwig Requardt,Anatoly Rosenfeld,Dieter R?hrich,Heidi Sandaker,Murielle Salomé,Bjarne Stugu
Physics , 2015, DOI: 10.1088/1748-0221/10/11/P11007
Abstract: Microbeam Radiation Therapy (MRT) is an emerging cancer treatment that is currently being developed at the European Synchrotron Radiation Facility (ESRF) in Grenoble, France. This technique uses a highly collimated and fractionated X-ray beam array with extremely high dose rate and very small divergence, to benefit from the dose-volume effect, thus sparing healthy tissue. In case of any beam anomalies and system malfunctions, special safety measures must be installed, such as an emergency safety shutter that requires continuous monitoring of the beam intensity profile. Within the 3DMiMic project, a novel silicon strip detector that can tackle the special features of MRT, such as the extremely high spatial resolution and dose rate, has been developed to be part of the safety shutter system. The first prototypes have been successfully fabricated, and experiments aimed to demonstrate their suitability for this unique application have been performed. Design, fabrication and the experimental results as well as any identified inadequacies for future optimisation are reported and discussed in this paper.
Alignment of the Pixel and SCT Modules for the 2004 ATLAS Combined Test Beam
A. Ahmad,A. Andreazza,T. Atkinson,J. Baines,A. J. Barr,R. Beccherle,P. J. Bell,J. Bernabeu,Z. Broklova,P. A. Bruckman de Renstrom,D. Cauz,L. Chevalier,S. Chouridou,M. Citterio,A. Clark,M. Cobal,T. Cornelissen,S. Correard,M. J. Costa,D. Costanzo,S. Cuneo,M. Dameri,G. Darbo,J. B. de Vivie,B. Di Girolamo,D. Dobos,Z. Drasal,J. Drohan,K. Einsweiler,M. Elsing,D. Emelyanov,C. Escobar,K. Facius,P. Ferrari,D. Fergusson,D. Ferrere,T. Flick,D. Froidevaux,G. Gagliardi,M. Gallas,B. J. Gallop,K. K. Gan,C. Garcia,I. L. Gavrilenko,C. Gemme,P. Gerlach,T. Golling,S. Gonzalez-Sevilla,M. J. Goodrick,G. Gorfine,T. Goettfert,J. Grosse-Knetter,P. H. Hansen,K. Hara,R. Hartel,A. Harvey,R. J. Hawkings,F. E. W. Heinemann,T. Henns,J. C. Hill,F. Huegging,E. Jansen,J. Joseph,M. Karagoz Unel,M. Kataoka,S. Kersten,A. Khomich,R. Klingenberg,P. Kodys,T. Koffas,N. Konstantinidis,V. Kostyukhin,C. Lacasta,T. Lari,S. Latorre,C. G. Lester,W. Liebig,A. Lipniacka,K. F. Lourerio,M. Mangin-Brinet,S. Marti i Garcia,M. Mathes,C. Meroni,B. Mikulec,B. Mindur,S. Moed,G. Moorhead,P. Morettini,E. W. J. Moyse,K. Nakamura,P. Nechaeva,K. Nikolaev,F. Parodi,S. Parzhitski,J. Pater,R. Petti,P. W. Phillips,B. Pinto,A. Poppleton,K. Reeves,I. Reisinger,P. Reznicek,P. Risso,D. Robinson,S. Roe,A. Rozanov,A. Salzburger,H. Sandaker,L. Santi,C. Schiavi,J. Schieck,J. Schultes,A. Sfyrla,C. Shaw,F. Tegenfeldt,C. J. W. P. Timmermans,B. Toczek,C. Troncon,M. Tyndel,F. Vernocchi,J. Virzi,T. Vu Anh,M. Warren,J. Weber,M. Weber,A. R. Weidberg
Physics , 2008, DOI: 10.1088/1748-0221/3/09/P09004
Abstract: A small set of final prototypes of the ATLAS Inner Detector silicon tracker (Pixel and SCT) were used to take data during the 2004 Combined Test Beam. Data were collected from runs with beams of different flavour (electrons, pions, muons and photons) with a momentum range of 2 to 180 GeV/c. Four independent methods were used to align the silicon modules. The corrections obtained were validated using the known momenta of the beam particles and were shown to yield consistent results among the different alignment approaches. From the residual distributions, it is concluded that the precision attained in the alignment of the silicon modules is of the order of 5 micrometers in their most precise coordinate.
Euler-Lagrange Elasticity: Differential Equations for Elasticity without Stress or Strain  [PDF]
H. H. Hardy
Journal of Applied Mathematics and Physics (JAMP) , 2013, DOI: 10.4236/jamp.2013.17004

Differential equations to describe elasticity are derived without the use of stress or strain. The points within the body are the independent parameters instead of strain and surface forces replace stress tensors. These differential equations are a continuous analytical model that can then be solved using any of the standard techniques of differential equations. Although the equations do not require the definition stress or strain, these quantities can be calculated as dependent parameters. This approach to elasticity is simple, which avoids the need for multiple definitions of stress and strain, and provides a simple experimental procedure to find scalar representations of material properties in terms of the energy of deformation. The derived differential equations describe both infinitesimal and finite deformations.

Euler-Lagrange Elasticity with Dynamics  [PDF]
H. H. Hardy
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.213138
Abstract: The equations of Euler-Lagrange elasticity describe elastic deformations without reference to stress or strain. These equations as previously published are applicable only to quasi-static deformations. This paper extends these equations to include time dependent deformations. To accomplish this, an appropriate Lagrangian is defined and an extrema of the integral of this Lagrangian over the original material volume and time is found. The result is a set of Euler equations for the dynamics of elastic materials without stress or strain, which are appropriate for both finite and infinitesimal deformations of both isotropic and anisotropic materials. Finally, the resulting equations are shown to be no more than Newton's Laws applied to each infinitesimal volume of the material.
Linear Algebra Provides a Basis for Elasticity without Stress or Strain  [PDF]
H. H. Hardy
Soft (Soft) , 2015, DOI: 10.4236/soft.2015.43003
Abstract: Linear algebra provides insights into the description of elasticity without stress or strain. Classical descriptions of elasticity usually begin with defining stress and strain and the constitutive equations of the material that relate these to each other. Elasticity without stress or strain begins with the positions of the points and the energy of deformation. The energy of deformation as a function of the positions of the points within the material provides the material properties for the model. A discrete or continuous model of the deformation can be constructed by minimizing the total energy of deformation. As presented, this approach is limited to hyper-elastic materials, but is appropriate for infinitesimal and finite deformations, isotropic and anisotropic materials, as well as quasi-static and dynamic responses.
Page 1 /149791
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.