C. Grah
University of Wuppertal
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Publication
Featured researches published by C. Grah.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2002
I. Gorelov; Grant Gorfine; M. R. Hoeferkamp; S. Seidel; A. Ciocio; K. Einsweiler; M. Gilchriese; A Joshi; S. Kleinfelder; R. Marchesini; O Milgrome; N Palaio; F Pengg; J. Richardson; G. Zizka; M. Ackers; P. Fischer; M. Keil; S. Meuser; T. Stockmanns; J. Treis; N. Wermes; C. Gößling; F. Hügging; J. Wüstenfeld; R. Wunstorf; Dario Barberis; R. Beccherle; M. Cervetto; Giovanni Darbo
Silicon pixel sensors developed by the ATLAS collaboration to meet LHC requirements and to withstand hadronic irradiation to fluences of up to
Journal of Instrumentation | 2010
H. Abramowicz; Angel Abusleme; K. Afanaciev; Jonathan Aguilar; Prasoon Ambalathankandy; P. Bambade; M. Bergholz; I. Bozovic-Jelisavcic; E. Castro; G. A. Chelkov; Cornelia Coca; W. Daniluk; A. Dragone; L. Dumitru; K. Elsener; Igor Emeliantchik; T. Fiutowski; M. I. Gostkin; C. Grah; G. Grzelak; Gunter Haller; H. Henschel; Alexandr Ignatenko; M. Idzik; Kazutoshi Ito; T. Jovin; Eryk Kielar; Jerzy Kotula; Zinovi Krumstein; Szymon Kulis
10^{15} n_eq/cm^{2}
ieee nuclear science symposium | 2006
C. Grah; K. Afanaciev; I. Emeliantchek; U. Harder; H. Henschel; Alexandr Ignatenko; E. Kouznetsova; W. Lange; Wolfgang Lohmann; M. Ohlerich; R. Schmidt
have been evaluated using a test beam facility at CERN providing a magnetic field. The Lorentz angle was measured and found to alter from 9.0 deg. before irradiation, when the detectors operated at 150 V bias at B=1.48 T, to 3.1 deg after irradiation and operating at 600 V bias at 1.01 T. In addition to the effect due to magnetic field variation, this change is explained by the variation of the electric field inside the detectors arising from the different bias conditions. The depletion depths of irradiated sensors at various bias voltages were also measured. At 600 V bias 280 micron thick sensors depleted to ~200 micron after irradiation at the design fluence of 1 10^{15} 1 MeV n_eq/cm2 and were almost fully depleted at a fluence of 0.5 * 10^{15} 1 MeV n_eq/cm2. The spatial resolution was measured for angles of incidence between 0 deg and 30 deg. The optimal value was found to be better than 5.3 micron before irradiation and 7.4 micron after irradiation.
ieee nuclear science symposium | 2007
C. Grah; K. Afanaciev; P. Bernitt; G. Chelkov; J. Gajewski; R. Heller; H. Henschel; Alexandr Ignatenko; Z. Krumshteyn; S. Kulis; W. Lange; Wolfgang Lohmann; M. Ohlerich; A. Rosco; A. Sapronov; R. Schmidt; S. Schuwalow
Two special calorimeters are foreseen for the instrumentation of the very forward region of the ILC detector, a luminometer designed to measure the rate of low angle Bhabha scattering events with a precision better than 10?3 and a low polar angle calorimeter, adjacent to the beam-pipe. The latter will be hit by a large amount of beamstrahlung remnants. The amount and shape of these depositions will allow a fast luminosity estimate and the determination of beam parameters. The sensors of this calorimeter must be radiation hard. Both devices will improve the hermeticity of the detector in the search for new particles. Finely segmented and very compact calorimeters will match the requirements. Due to the high occupancy fast front-end electronics is needed. The design of the calorimeters developed and optimised with Monte Carlo simulations is presented. Sensors and readout electronics ASICs have been designed and prototypes are available. Results on the performance of these major components are summarised.
