Astroparticle, Particle and Space Physics, Detectors and Medical Physics Applications - Proceedings of the 8th Conference, 2004
Excellent jet energy reconstruction and shower separation are of utmost importance for experiment... more Excellent jet energy reconstruction and shower separation are of utmost importance for experiments at future e+ e~ linear colliders. The energy flow algorithms, proven to be extremely effective at LEP, require a highly segmented calorimeter, both longitudinally and trasversely to the shower axis. The proposed technique is meant to fulfill those requirements. It consists of a sampling calorimeter made by absorber and scintillator layers with wavelength shifting fibers, complemented by three planes of Silicon pads to obtain very ...
Medical Imaging 2004: Visualization, Image-Guided Procedures, and Display, 2004
The planned target volume in intracoronary brachytherapy is the vessel wall. The success of the t... more The planned target volume in intracoronary brachytherapy is the vessel wall. The success of the treatment is based on the need of delivering doses possibly not lower than 8 and not higher than 30 Gy. An automatic procedure in order to acquire intravascular ultrasound images of the whole volume to be irradiated is pointed out; a motor driven pullback device,
Abstract Real time dosimetry is a critical issue in most radiotherapy applications. SUCIMA (Silic... more Abstract Real time dosimetry is a critical issue in most radiotherapy applications. SUCIMA (Silicon Ultra fast Cameras for electron and gamma sources In Medical Applications) is a project addressing the development of an imaging technique of extended radioactive sources based on monolithic and hybrid position sensitive silicon sensors, where" imaging" has to be understood as the record of a dose map. The requirements for the detectors are given by the main applications, namely brachytherapy and real time monitoring of a proton ...
Excellent jet energy reconstruction and shower separation are of utmost importance for experiment... more Excellent jet energy reconstruction and shower separation are of utmost importance for experiments at future e· e-linear colliders. The energy flow algorithms, proven to be extremely effective at LEP, require a highly segmented calorimeter, both longitudinally and trasversely to the shower axis. The proposed technique is meant to fulfill those requirements.
An excellent jet energy reconstruction is a very important requirement for a Linear Collider Dete... more An excellent jet energy reconstruction is a very important requirement for a Linear Collider Detector [1]. The capability to separate the contribution due to charged particles measured by the tracking system from the one coming from neutral particles detected in the calorimeters is mandatory for jet measurements.
Answering a question of Geelen, Gerards, Robertson and Whittle [2], we prove that the branchwidth... more Answering a question of Geelen, Gerards, Robertson and Whittle [2], we prove that the branchwidth of a bridgeless graph is equal to the branchwidth of its cycle matroid. Our proof is based on branch-decompositions of hypergraphs.
Page 1. LHCb Collaboration LHCb 00-0 RICH 000 00 xxxxxxxxx, 0000 LHCb RICH-2 Mechanics O. Ullalan... more Page 1. LHCb Collaboration LHCb 00-0 RICH 000 00 xxxxxxxxx, 0000 LHCb RICH-2 Mechanics O. Ullaland, D. Voillat, P. Wertelaers, P. Wicht European Organization for Nuclear Research, Geneva, Switzerland S. Cuneo, V. Gracco, P. Musico, A. Petrolini, M. Sannino Universita Dipart. di Fisica, di Genova, Genova, Italy M.
With the help of a software package for solving Maxwell equations, MAFIA, a design of the magneti... more With the help of a software package for solving Maxwell equations, MAFIA, a design of the magnetic shielding of the photodetectors array of RICH2 is proposed.
University of Bristol, Bristol, UK NH Brook, RD Head, F. Metlica, A. Muir, A. Phillips, FF Wilson... more University of Bristol, Bristol, UK NH Brook, RD Head, F. Metlica, A. Muir, A. Phillips, FF Wilson University of Cambridge, Cambridge, UK A. Buckley, V. Gibson, K. Harrison, CR Jones, SG Katvars, C. Lazzeroni, J. Storey, CP Ward, SA Wotton University of Milano-Bicocca and INFN, Milano, Italy M. Alemi, T. Bellunato, M. Calvi, C. Matteuzzi, M. Musy, P. Negri, D. Perego University of Edinburgh, Edinburgh, UK R. Chamonal, S. Eisenhardt, J. Lawrence, J .McCarron, F. Muheim, S. Playfer, A.
Beam tests were performed in 1998 to investigate the performance of a prototype of the downstream... more Beam tests were performed in 1998 to investigate the performance of a prototype of the downstream RICH of the LHCb using hybrid photo-diodes and multi anode PMTs. The angular resolutions obtained from these photodetectors under various experimental configurations are compared with the expectations from simulation.
Abstract Inclusive jet cross sections are measured in photoproduction at HERA using the H1 detect... more Abstract Inclusive jet cross sections are measured in photoproduction at HERA using the H1 detector. The data sample of e+p→ e++ jet+ X events in the kinematic range of photon virtualities Q2≤ 1 GeV2 and photon-proton centre-of-mass energies 95≤ Wγp≤ 285 GeV represents an integrated luminosity of 24.1 pb− 1. Jets are defined using the inclusive k⊥ algorithm.
Abstract Two different stacks of aerogel were tested on a pion/proton beam of momentum between 3 ... more Abstract Two different stacks of aerogel were tested on a pion/proton beam of momentum between 3 and 10 GeV/c. The optical characteristics of the tested aerogel samples were different: in particular one sample was hygroscopic while the other was hydrophobic. Two HPD tubes were used as photodetectors, and different thickness of the stacks were tried, in order to determine the photoelectron yield, the Cherenkov angle and its resolution. π/p separation has been proved up to momenta of 10 GeV/c.
We have constructed a prototype of an electromagnetic calorimeter, for future linear collider exp... more We have constructed a prototype of an electromagnetic calorimeter, for future linear collider experiments, alternating 45 layers of lead and scintillator planes. The scintillation light is collected by means of WLS fibers from square cells of 5×5 cm2. To improve the reconstruction of the shower profile, three silicon pad (∼0.9×0.9 cm2) detector planes have been inserted between the lead and scintillator layers at 2.6 and 12 X0. The prototype has been tested with electron beams at low (50÷750 MeV) and high energies (5÷50 GeV): a good linearity in response and an energy resolution of ∼11.5%/√(E/GeV) have been achieved. A position resolution of 2.5 mm has also been measured for 10 GeV impinging electrons. The calorimeter particle identification capability has been tested comparing electron and pion beams.
We present the results obtained by testing in a beam sample of silica aerogel which is foreseen a... more We present the results obtained by testing in a beam sample of silica aerogel which is foreseen as one of the radiators for the Ring Imaging Cherenkov counter of LHCb. Pion and proton beams with momenta ranging from 6 to 10 GeV/c traversed different thickness of aerogel. Two large diameter (12 cm) Hybrid Photodiodes with 2048 channels, produced at CERN, were used as photodetectors. The number of photoelectrons and the radius of the Cherenkov rings allowed pion-proton separation over the whole considered momentum range. r (M. Paganoni) 0168-9002/02/$ -see front matter r 2002 Elsevier Science B.V. All rights reserved. PII: S 0 1 6 8 -9 0 0 2 ( 0 1 ) 0 1 8 2 6 -5
A prototype of an electromagnetic sampling calorimeter for future linear collider experiments has... more A prototype of an electromagnetic sampling calorimeter for future linear collider experiments has been commissioned by the LCCAL collaboration. In order to improve the reconstruction of the shower profile, three silicon pad detector planes have been inserted between lead and scintillator layers at 2, 6 and 12 X0. The scintillator light is collected by means of lateral W.L.S. fibers. The electrical parameters of the pad detectors have been determined by a static IV and CV characterisation; charge collection efficiency and tracking capability have been measured during beam tests. Results from test-beam runs are shown.
This document describes the concepts of the engineering design to be adopted for the upstream Rin... more This document describes the concepts of the engineering design to be adopted for the upstream Ring Imaging Cherenkov detector (RICH 1) of the reoptimized LHCb detector. Our aim is to ensure that coherent solutions for the engineering design and integration for all components of RICH 1 are available, before proceeding with the detailed design of these components.
The use of aerogel as a radiator in the RICH detectors of LHCb is a challenge due to the hot envi... more The use of aerogel as a radiator in the RICH detectors of LHCb is a challenge due to the hot environment of the hadron collider LHC. Large size tiles of silica aerogel were recently produced with unprecedented optical quality for such dimensions. Results of laboratory measurements and beam tests are briefly reported. A description of a method to measure the uniformity of the index of refraction within the tile is given.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, Jan 1, 2004
Real-time dosimetry is a critical issue in most radiotherapy applications. Silicon Ultra fast Cam... more Real-time dosimetry is a critical issue in most radiotherapy applications. Silicon Ultra fast Cameras for electron and gamma sources In Medical Applications (Nucl. Phys. B 125 (2003) 133) is an EC project addressing the development of an imaging device for extended radioactive sources based on monolithic and hybrid-position-sensitive silicon sensors. Large-area Silicon strip detectors read out by low noise charge integrating chips were used to characterize a 90Sr intravascular brachytherapy source in terms of dose–depth curves in a tissue equivalent material and homogeneity of the activity. The results obtained with the Silicon sensor were compared to measurements with standard certified systems and are reported in the paper.
We report on the ongoing work towards a hybrid photon detector with integrated silicon pixel read... more We report on the ongoing work towards a hybrid photon detector with integrated silicon pixel readout for the ring imaging Cherenkov detectors of the LHCb experiment at the Large Hadron Collider at CERN. The photon detector is based on a cross-focussed image intensifier tube geometry where the image is de-magnified by a factor of 4. The anode consists of a silicon pixel array, bump-bonded to a fast, binary readout chip with matching pixel electronics.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, Jan 1, 2000
We report on the ongoing work towards a hybrid photon detector with integrated silicon pixel read... more We report on the ongoing work towards a hybrid photon detector with integrated silicon pixel readout for the ring imaging Cherenkov detectors of the LHCb experiment at the Large Hadron Collider at CERN. The photon detector is based on an electrostatically focussed image intensifier tube geometry where the image is de-magnified by a factor of ∼5. The anode consists of a silicon pixel array, bump-bonded to a binary readout chip with matching pixel electronics. The performance of full-scale prototypes equipped with 61-pixel anodes and external analogue readout is presented. The average signal-to-noise ratio is ∼11 with a peaking time of 1.2 μs. The tube active-to-total surface ratio is 81.7%, which meets the LHCb requirements. The spatial precision is measured to be better than 90 μm. A cluster of three such tubes has been installed in the LHCb RICH 1 prototype where Cherenkov gas rings have been successfully detected. Progress towards the encapsulation of new pixel electronics into a tube is also reported. In particular, the status of the development of a binary readout chip with a peaking time of 25 ns and a low and uniform detection threshold is summarized.
Astroparticle, Particle and Space Physics, Detectors and Medical Physics Applications - Proceedings of the 8th Conference, 2004
Excellent jet energy reconstruction and shower separation are of utmost importance for experiment... more Excellent jet energy reconstruction and shower separation are of utmost importance for experiments at future e+ e~ linear colliders. The energy flow algorithms, proven to be extremely effective at LEP, require a highly segmented calorimeter, both longitudinally and trasversely to the shower axis. The proposed technique is meant to fulfill those requirements. It consists of a sampling calorimeter made by absorber and scintillator layers with wavelength shifting fibers, complemented by three planes of Silicon pads to obtain very ...
Medical Imaging 2004: Visualization, Image-Guided Procedures, and Display, 2004
The planned target volume in intracoronary brachytherapy is the vessel wall. The success of the t... more The planned target volume in intracoronary brachytherapy is the vessel wall. The success of the treatment is based on the need of delivering doses possibly not lower than 8 and not higher than 30 Gy. An automatic procedure in order to acquire intravascular ultrasound images of the whole volume to be irradiated is pointed out; a motor driven pullback device,
Abstract Real time dosimetry is a critical issue in most radiotherapy applications. SUCIMA (Silic... more Abstract Real time dosimetry is a critical issue in most radiotherapy applications. SUCIMA (Silicon Ultra fast Cameras for electron and gamma sources In Medical Applications) is a project addressing the development of an imaging technique of extended radioactive sources based on monolithic and hybrid position sensitive silicon sensors, where" imaging" has to be understood as the record of a dose map. The requirements for the detectors are given by the main applications, namely brachytherapy and real time monitoring of a proton ...
Excellent jet energy reconstruction and shower separation are of utmost importance for experiment... more Excellent jet energy reconstruction and shower separation are of utmost importance for experiments at future e· e-linear colliders. The energy flow algorithms, proven to be extremely effective at LEP, require a highly segmented calorimeter, both longitudinally and trasversely to the shower axis. The proposed technique is meant to fulfill those requirements.
An excellent jet energy reconstruction is a very important requirement for a Linear Collider Dete... more An excellent jet energy reconstruction is a very important requirement for a Linear Collider Detector [1]. The capability to separate the contribution due to charged particles measured by the tracking system from the one coming from neutral particles detected in the calorimeters is mandatory for jet measurements.
Answering a question of Geelen, Gerards, Robertson and Whittle [2], we prove that the branchwidth... more Answering a question of Geelen, Gerards, Robertson and Whittle [2], we prove that the branchwidth of a bridgeless graph is equal to the branchwidth of its cycle matroid. Our proof is based on branch-decompositions of hypergraphs.
Page 1. LHCb Collaboration LHCb 00-0 RICH 000 00 xxxxxxxxx, 0000 LHCb RICH-2 Mechanics O. Ullalan... more Page 1. LHCb Collaboration LHCb 00-0 RICH 000 00 xxxxxxxxx, 0000 LHCb RICH-2 Mechanics O. Ullaland, D. Voillat, P. Wertelaers, P. Wicht European Organization for Nuclear Research, Geneva, Switzerland S. Cuneo, V. Gracco, P. Musico, A. Petrolini, M. Sannino Universita Dipart. di Fisica, di Genova, Genova, Italy M.
With the help of a software package for solving Maxwell equations, MAFIA, a design of the magneti... more With the help of a software package for solving Maxwell equations, MAFIA, a design of the magnetic shielding of the photodetectors array of RICH2 is proposed.
University of Bristol, Bristol, UK NH Brook, RD Head, F. Metlica, A. Muir, A. Phillips, FF Wilson... more University of Bristol, Bristol, UK NH Brook, RD Head, F. Metlica, A. Muir, A. Phillips, FF Wilson University of Cambridge, Cambridge, UK A. Buckley, V. Gibson, K. Harrison, CR Jones, SG Katvars, C. Lazzeroni, J. Storey, CP Ward, SA Wotton University of Milano-Bicocca and INFN, Milano, Italy M. Alemi, T. Bellunato, M. Calvi, C. Matteuzzi, M. Musy, P. Negri, D. Perego University of Edinburgh, Edinburgh, UK R. Chamonal, S. Eisenhardt, J. Lawrence, J .McCarron, F. Muheim, S. Playfer, A.
Beam tests were performed in 1998 to investigate the performance of a prototype of the downstream... more Beam tests were performed in 1998 to investigate the performance of a prototype of the downstream RICH of the LHCb using hybrid photo-diodes and multi anode PMTs. The angular resolutions obtained from these photodetectors under various experimental configurations are compared with the expectations from simulation.
Abstract Inclusive jet cross sections are measured in photoproduction at HERA using the H1 detect... more Abstract Inclusive jet cross sections are measured in photoproduction at HERA using the H1 detector. The data sample of e+p→ e++ jet+ X events in the kinematic range of photon virtualities Q2≤ 1 GeV2 and photon-proton centre-of-mass energies 95≤ Wγp≤ 285 GeV represents an integrated luminosity of 24.1 pb− 1. Jets are defined using the inclusive k⊥ algorithm.
Abstract Two different stacks of aerogel were tested on a pion/proton beam of momentum between 3 ... more Abstract Two different stacks of aerogel were tested on a pion/proton beam of momentum between 3 and 10 GeV/c. The optical characteristics of the tested aerogel samples were different: in particular one sample was hygroscopic while the other was hydrophobic. Two HPD tubes were used as photodetectors, and different thickness of the stacks were tried, in order to determine the photoelectron yield, the Cherenkov angle and its resolution. π/p separation has been proved up to momenta of 10 GeV/c.
We have constructed a prototype of an electromagnetic calorimeter, for future linear collider exp... more We have constructed a prototype of an electromagnetic calorimeter, for future linear collider experiments, alternating 45 layers of lead and scintillator planes. The scintillation light is collected by means of WLS fibers from square cells of 5×5 cm2. To improve the reconstruction of the shower profile, three silicon pad (∼0.9×0.9 cm2) detector planes have been inserted between the lead and scintillator layers at 2.6 and 12 X0. The prototype has been tested with electron beams at low (50÷750 MeV) and high energies (5÷50 GeV): a good linearity in response and an energy resolution of ∼11.5%/√(E/GeV) have been achieved. A position resolution of 2.5 mm has also been measured for 10 GeV impinging electrons. The calorimeter particle identification capability has been tested comparing electron and pion beams.
We present the results obtained by testing in a beam sample of silica aerogel which is foreseen a... more We present the results obtained by testing in a beam sample of silica aerogel which is foreseen as one of the radiators for the Ring Imaging Cherenkov counter of LHCb. Pion and proton beams with momenta ranging from 6 to 10 GeV/c traversed different thickness of aerogel. Two large diameter (12 cm) Hybrid Photodiodes with 2048 channels, produced at CERN, were used as photodetectors. The number of photoelectrons and the radius of the Cherenkov rings allowed pion-proton separation over the whole considered momentum range. r (M. Paganoni) 0168-9002/02/$ -see front matter r 2002 Elsevier Science B.V. All rights reserved. PII: S 0 1 6 8 -9 0 0 2 ( 0 1 ) 0 1 8 2 6 -5
A prototype of an electromagnetic sampling calorimeter for future linear collider experiments has... more A prototype of an electromagnetic sampling calorimeter for future linear collider experiments has been commissioned by the LCCAL collaboration. In order to improve the reconstruction of the shower profile, three silicon pad detector planes have been inserted between lead and scintillator layers at 2, 6 and 12 X0. The scintillator light is collected by means of lateral W.L.S. fibers. The electrical parameters of the pad detectors have been determined by a static IV and CV characterisation; charge collection efficiency and tracking capability have been measured during beam tests. Results from test-beam runs are shown.
This document describes the concepts of the engineering design to be adopted for the upstream Rin... more This document describes the concepts of the engineering design to be adopted for the upstream Ring Imaging Cherenkov detector (RICH 1) of the reoptimized LHCb detector. Our aim is to ensure that coherent solutions for the engineering design and integration for all components of RICH 1 are available, before proceeding with the detailed design of these components.
The use of aerogel as a radiator in the RICH detectors of LHCb is a challenge due to the hot envi... more The use of aerogel as a radiator in the RICH detectors of LHCb is a challenge due to the hot environment of the hadron collider LHC. Large size tiles of silica aerogel were recently produced with unprecedented optical quality for such dimensions. Results of laboratory measurements and beam tests are briefly reported. A description of a method to measure the uniformity of the index of refraction within the tile is given.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, Jan 1, 2004
Real-time dosimetry is a critical issue in most radiotherapy applications. Silicon Ultra fast Cam... more Real-time dosimetry is a critical issue in most radiotherapy applications. Silicon Ultra fast Cameras for electron and gamma sources In Medical Applications (Nucl. Phys. B 125 (2003) 133) is an EC project addressing the development of an imaging device for extended radioactive sources based on monolithic and hybrid-position-sensitive silicon sensors. Large-area Silicon strip detectors read out by low noise charge integrating chips were used to characterize a 90Sr intravascular brachytherapy source in terms of dose–depth curves in a tissue equivalent material and homogeneity of the activity. The results obtained with the Silicon sensor were compared to measurements with standard certified systems and are reported in the paper.
We report on the ongoing work towards a hybrid photon detector with integrated silicon pixel read... more We report on the ongoing work towards a hybrid photon detector with integrated silicon pixel readout for the ring imaging Cherenkov detectors of the LHCb experiment at the Large Hadron Collider at CERN. The photon detector is based on a cross-focussed image intensifier tube geometry where the image is de-magnified by a factor of 4. The anode consists of a silicon pixel array, bump-bonded to a fast, binary readout chip with matching pixel electronics.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, Jan 1, 2000
We report on the ongoing work towards a hybrid photon detector with integrated silicon pixel read... more We report on the ongoing work towards a hybrid photon detector with integrated silicon pixel readout for the ring imaging Cherenkov detectors of the LHCb experiment at the Large Hadron Collider at CERN. The photon detector is based on an electrostatically focussed image intensifier tube geometry where the image is de-magnified by a factor of ∼5. The anode consists of a silicon pixel array, bump-bonded to a binary readout chip with matching pixel electronics. The performance of full-scale prototypes equipped with 61-pixel anodes and external analogue readout is presented. The average signal-to-noise ratio is ∼11 with a peaking time of 1.2 μs. The tube active-to-total surface ratio is 81.7%, which meets the LHCb requirements. The spatial precision is measured to be better than 90 μm. A cluster of three such tubes has been installed in the LHCb RICH 1 prototype where Cherenkov gas rings have been successfully detected. Progress towards the encapsulation of new pixel electronics into a tube is also reported. In particular, the status of the development of a binary readout chip with a peaking time of 25 ns and a low and uniform detection threshold is summarized.
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