E. Rodrigues
University of Cincinnati
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Featured researches published by E. Rodrigues.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2012
Kazuyoshi Carvalho Akiba; M. Artuso; Ryan Badman; A. Borgia; Richard Bates; Florian Bayer; Martin van Beuzekom; J. Buytaert; Enric Cabruja; M. Campbell; P. Collins; Michael Crossley; R. Dumps; L. Eklund; D. Esperante; C. Fleta; A. Gallas; M. Gandelman; J. Garofoli; M. Gersabeck; V. V. Gligorov; H. Gordon; E.H.M. Heijne; V. Heijne; D. Hynds; M. John; A. Leflat; Lourdes Ferre Llin; X. Llopart; M. Lozano
A prototype particle tracking telescope was constructed using Timepix and Medipix ASIC hybrid pixel assemblies as the six sensing planes. Each telescope plane consisted of one 1.4 cm2 assembly, providing a 256 ×256 array of 55μm square pixels. The telescope achieved a pointing resolution of 2.4μm at the position of the device under test. During a beam test in 2009 the telescope was used to evaluate in detail the performance of two Timepix hybrid pixel assemblies; a standard planar 300μm thick sensor, and 285μm thick double sided 3D sensor. This paper describes a charge calibration study of the pixel devices, which allows the true charge to be extracted, and reports on measurements of the charge collection characteristics and Landau distributions. The planar sensor achieved a best resolution of 4.0±0.1μm for angled tracks, and resolutions of between 4.4 and 11μm for perpendicular tracks, depending on the applied bias voltage. The double sided 3D sensor, which has significantly less charge sharing, was found to have an optimal resolution of 9.0±0.1μm for angled tracks, and a resolution of 16.0±0.2μm for perpendicular tracks. Based on these studies it is concluded that the Timepix ASIC shows an excellent performance when used as a device for charged particle tracking.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2011
P. Collins; K. Akiba; M. Alexander; M. Artuso; Florian Bayer; M. van Beuzekom; S. Blusk; T. J. V. Bowcock; J. Buytaert; M. Campbell; V. Coco; M. Crossley; R. Dumps; L. Eklund; D. Esperante; L. Ferre Llin; A. Gallas; M. Gandelman; M. Gersabeck; V. V. Gligorov; T. Huse; M. John; M. Kucharczyk; X. Llopart; D. Maneuski; Thilo Michel; R. Mountain; M. Nichols; A. Papadelis; C. Parkes
Abstract The LHCb experiment plans to have a fully upgraded detector and data acquisition system in order to take data with instantaneous luminosities up to 5 times greater than currently. For this reason the first tracking and vertexing detector, the VELO, will be completely redesigned to be able to cope with the much larger occupancies and data acquisition rates. Two main design alternatives, micro-strips or pixel detectors, are under consideration to build the upgraded detector. This paper describes the options presently under consideration, as well as a few highlights of the main aspects of the current R&D. Preliminary results using a pixel telescope are also presented.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2013
J. Amoraal; J. Blouw; S. Blusk; S. Borghi; M. Cattaneo; N. Chiapolini; G. Conti; M. Deissenroth; F. Dupertuis; R. Van Der Eijk; V. Fave; M. Gersabeck; A. Hicheur; W. Hulsbergen; D. Hutchcroft; A. Kozlinskiy; R. W. Lambert; F. Maciuc; R. Märki; M. Martinelli; Marcel Merk; M. Needham; L. Nicolas; J. Palacios; C. Parkes; A. Pellegrino; S. Pozzi; G. Raven; E. Rodrigues; C. Salzmann
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 D-0 -> K-pi(+) decays to remove a curvature bias in the LHCb spectrometer. (c) 2013 Elsevier B.V. All rights reserved.
Journal of Instrumentation | 2013
A. Affolder; K. Akiba; M. Alexander; S. Ali; M. Artuso; J. Benton; M. van Beuzekom; P. M. Bjørnstad; G. Bogdanova; S. Borghi; T. J. V. Bowcock; H. Brown; J. Buytaert; G. Casse; P. Collins; S. De Capua; D. Dossett; L. Eklund; C. Farinelli; J. Garofoli; M. Gersabeck; Timothy Gershon; H. Gordon; J. Harrison; V. Heijne; K. Hennessy; D. Hutchcroft; E. Jans; M. John; T. Ketel
LHCb is a dedicated experiment to study New Physics in the decays of beauty and charm hadrons at the Large Hadron Collider (LHC) at CERN. The beauty and charm hadrons are identified through their flight distance in the Vertex Locator (VELO), and hence the detector is critical for both the trigger and offline physics analyses. Due to their close proximity to the LHC beam the VELO sensors are exposed to higher ftuences than those of any other LHC subdetector. These proceedings present the primary results from radiation damage studies performed from the start of LHC data taking until late 2012. They include the first observation of type-inversion at the LHC, the highest statistics measurement of the silicon effective band gap after irradiation, and the observation of a radiation-induced charge loss effect due to the presence of a second metal layer.
Journal of Instrumentation | 2011
A. Mac Raighne; K. Akiba; L. Alianelli; R. L. Bates; M. van Beuzekom; J. Buytaert; M. Campbell; P. Collins; M. Crossley; R. Dumps; L. Eklund; C. Fleta; A. Gallas; M. Gersabeck; E.N. Gimenez; V.V. Gligorov; M. John; X. Llopart; M. Lozano; D. Maneuski; Julien Marchal; M. Nicol; R. Plackett; C. Parkes; G. Pellegrini; D Pennicard; E. Rodrigues; G. A. Stewart; Kawal Sawhney; N. Tartoni
Three-dimensional (3D) silicon sensors offer potential advantages over standard planar sensors for radiation hardness in future high energy physics experiments and reduced charge-sharing for X-ray applications, but may introduce inefficiencies due to the columnar electrodes. These inefficiencies are probed by studying variations in response across a unit pixel cell in a 55μm pitch double-sided 3D pixel sensor bump bonded to TimePix and Medipix2 readout ASICs. Two complementary characterisation techniques are discussed: the first uses a custom built telescope and a 120GeV pion beam from the Super Proton Synchrotron (SPS) at CERN; the second employs a novel technique to illuminate the sensor with a micro-focused synchrotron X-ray beam at the Diamond Light Source, UK. For a pion beam incident perpendicular to the sensor plane an overall pixel efficiency of 93.0±0.5% is measured. After a 10o rotation of the device the effect of the columnar region becomes negligible and the overall efficiency rises to 99.8±0.5%. The double-sided 3D sensor shows significantly reduced charge sharing to neighbouring pixels compared to the planar device. The charge sharing results obtained from the X-ray beam study of the 3D sensor are shown to agree with a simple simulation in which charge diffusion is neglected. The devices tested are found to be compatible with having a region in which no charge is collected centred on the electrode columns and of radius 7.6±0.6μm. Charge collection above and below the columnar electrodes in the double-sided 3D sensor is observed.
ieee nuclear science symposium | 2009
Aaron Mac Raighne; K. Akiba; L. Alianelli; M. Artuso; R. L. Bates; Florian Bayer; J. Buytaert; P. Collins; M. Crossley; L. Eklund; C. Fleta; A. Gallas; M. Gandelman; M. Gersabeck; E.N. Gimenez; V.V. Gligorov; T. Huse; M. John; Lourdes Ferre Llin; M. Lozano; D. Maneuski; Julien Marchal; Thilo Michel; Michelle Nicol; Giulio Pellegrini; D. E. Perira; R. Plackett; V. O'Shea; C. Parkes; E. Rodrigues
In this article we report on the use micro-focus synchrotron X-ray radiation and pion beams to compare the detection efficiencies and charge sharing properties of novel 3D detectors to that of the current planar technology. Detector substrates are bump-bonded to the Medipx2 and Timepix chips. 55μm square pixel maps of the detection efficiencies have been produced using X-ray and MIP beams. For X-rays, a drop of 3-4% detection efficiency over the pixel area was found due to the central electrode. The corner electrodes show no degradation in efficiency compared to that of the planar device. For MIPs a drop of 0.5% in efficiency due to the central electrode was observed. Evidence of a considerable reduction in charge sharing in the 3D detectors compared to the planar devices is also shown.
Physics Letters B | 2017
C. Q. Geng; Y.K. Hsiao; E. Rodrigues
We study for the first time the three-body charmless baryonic decays
Physical Review D | 2016
C. Q. Geng; Y. K. Hsiao; E. Rodrigues
\bar B^0_s\to \bar p \Lambda M^+ (p \bar \Lambda M^-)
arXiv: Computational Physics | 2018
L. A. T. Bauerdick; Martin Ritter; Oliver Gutsche; M. D. Sokoloff; N. F. Castro; M. Girone; T. Sakuma; P. Elmer; Brian Bockelman; Elizabeth Sexton-Kennedy; G. Watts; J. Letts; F. Würthwein; C. Vuosalo; Jim Pivarski; Daniel S. Katz; Riccardo Maria Bianchi; K. Cranmer; Robert Gardner; Shawn Patrick McKee; B. Hegner; E. Rodrigues; David Lange; Christoph Paus; JoséM. Hernández; K. Pedro; Bodhitha Jayatilaka; Lukasz Kreczko
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Proceedings of The European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2017) | 2018
E. Rodrigues
M=\pi, K