المؤلفون: Amoraal, J.¹, Blouw, J.², Blusk, S.³, Borghi, S.^4,5, Cattaneo, M.⁶, Chiapolini, N.⁷, Conti, G.⁸, Deissenroth, M.², Dupertuis, F.⁸, van der Eijk, R.¹, Fave, V.⁸, Gersabeck, M.⁶, Hicheur, A.⁸, Hulsbergen, W.¹ wouter.hulsbergen@nikhef.nl, Hutchcroft, D.⁹, Kozlinskiy, A.¹, Lambert, R.W.¹, Maciuc, F.¹⁰, Märki, R.⁸ raphael.marki@epfl.ch, Martinelli, M.¹

المصدر: Nuclear Instruments & Methods in Physics Research Section A. Jun2013, Vol. 712, p48-55. 8p.

مصطلحات موضوعية: *CONSTRAINT satisfaction, *COMPUTER software, *NUCLEAR counters, *PARTICLE tracks (Nuclear physics), *MOMENTUM (Mechanics), *LARGE Hadron Collider, *CURVATURE

مستخلص: Abstract: The software alignment of planar tracking detectors using samples of charged particle trajectories may lead to global detector distortions that affect vertex and momentum resolution. We present an alignment procedure that constrains such distortions by making use of samples of decay vertices reconstructed from two or more trajectories and putting constraints on their invariant mass. We illustrate the method by using a sample of invariant-mass constrained vertices from decays to remove a curvature bias in the LHCb spectrometer. [Copyright &y& Elsevier]

المؤلفون: Parkes, C.¹ c.parkes@physics.gla.ac.uk, Borghi, S.¹, Bates, A.¹, Eklund, L.¹, Gersabeck, M.¹, Marinho, F.¹, Rakotomiaramanana, B.¹, Rodrigues, E.¹, Szumlak, T.¹, Affolder, A.², Bowcock, T.², Casse, G.², Donleavy, S.², Hennessy, K.², Huse, T.², Hutchcroft, D.², Mylroie-Smith, J.², Noor, A.², Patel, G.², Rinnert, K.²

المصدر: Nuclear Instruments & Methods in Physics Research Section A. Jun2009, Vol. 604 Issue 1/2, p1-4. 4p.

مصطلحات موضوعية: *NUCLEAR track detectors, *LARGE Hadron Collider, *PHYSICS experiments, *SYNCHRONIZATION, *PARTICLES (Nuclear physics), *SILICON diodes

مصطلحات جغرافية: FRANCE, SWITZERLAND

مستخلص: Abstract: The Vertex Locator of the LHCb experiment has been used to fully reconstruct beam induced tracks at the LHC. A beam of protons was collided with a beam absorber during the LHC synchronisation test of the anti-clockwise beam on the weekend 22nd–24th August 2008. The resulting particles have been observed by the Vertex Locator. The LHCb Vertex Locator is a silicon micro-strip detector containing 21 planes of modules. Tracks were observed passing through up to 19 modules (38 silicon sensors). A total of over 700 tracks were reconstructed, and are being used to study the calibration and alignment of the detector. [Copyright &y& Elsevier]

المؤلفون: Souvorov, V. vsevolod.souvorov@cern.ch, Schneider, T.¹, Schmidt, B.¹, Riegler, W.¹, Kashchuk, A.¹, Hutchcroft, D.¹

المصدر: Nuclear Instruments & Methods in Physics Research Section A. Dec2003, Vol. 515 Issue 1/2, p220. 6p.

مصطلحات موضوعية: *IRRADIATION, *GASES, *DRIFT chambers, *NUCLEAR counters

مستخلص: Aging studies for a multi-wire proportional chamber of the LHCb muon system have been performed using the CERN Gamma Irradiation Facility. The irradiated four-gap chamber corresponds to a full-size prototype with 1500 cm2 sensitive area and has been operated with an Ar/CO2/CF4 (40:50:10) gas mixture. A linear charge of ∼0.25 C/cm for 100 m anode wire length has been accumulated over a period of 6 months, which corresponds to the charge collected in 5 LHCb years. The observed aging effects do not prohibit the use of these chambers in the LHCb experiment. [Copyright &y& Elsevier]