The L3+C muon detector at the CERN electron-positron collider, LEP, is used for the detection of ... more The L3+C muon detector at the CERN electron-positron collider, LEP, is used for the detection of very-high-energy cosmic γ-ray sources through the observation of muons of energies above 20, 30, 50 and 100 GeV. Daily or monthly excesses in the rate of single-muon events pointing to some particular direction in the sky are searched for. The periods from mid July to November 1999, and April to November 2000 are considered. Special attention is also given to a selection of known γray sources. No statistically significant excess is observed for any direction or any particular source.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001
An emulsion spectrometer has been built and tested with pion beams in a 0.7 T magnetic field. A m... more An emulsion spectrometer has been built and tested with pion beams in a 0.7 T magnetic field. A momentum resolution, ∆P/P = 13% ± 1%, has been obtained for 5 and 10 GeV/c particles.
Laboratoire d&amp... more Laboratoire d'Annecy le Vieux de Physique des Particules.
We propose to complement the tracking devices of the HI experiment at the HERA ep-collider with h... more We propose to complement the tracking devices of the HI experiment at the HERA ep-collider with high resolution position sensitive detectors close to the beam line in the central and backward region. These detectors will improve the physics potential of the HI ...
It is expected that the peak luminosity delivered by the accelerator will increase to over 300 × ... more It is expected that the peak luminosity delivered by the accelerator will increase to over 300 × 10 30 cm −2 s −1. One of the upgraded systems is the Central Track Trigger (CTT). The CTT uses the Central Fiber Tracker (CFT) and Preshower detectors to identify central tracks with pT > 1.5 GeV at the first trigger level. Track candidates are formed by comparing fiber hits to predefined track equations. In order to minimize latency, this operation is performed in parallel using combinatorial logic implemented in FPGAs. Limited hardware resources prevented the use of the full granularity of the CFT. This leads to a high fake track rate as the occupancy increases. In order to mitigate the problem, new trackfinding hardware was designed and commissioned. We report on the upgrade and the improved performance of the CTT system.
This paper describes the electronics used for the ATLAS monitored drift tube (MDT) chambers. Thes... more This paper describes the electronics used for the ATLAS monitored drift tube (MDT) chambers. These chambers are the main component of the precision tracking system in the ATLAS muon spectrometer. The MDT detector system consists of 1,150 chambers containing a total of 354,000 drift tubes. It is capable of measuring the sagitta of muon tracks to an accuracy of 60 µm, which corresponds to a momentum accuracy of about 10% at p T = 1 TeV. The design and performance of the MDT readout electronics as well as the electronics for controlling, monitoring and powering the detector will be discussed. These electronics have been extensively tested under simulated running conditions and have undergone radiation testing certifying them for more than 10 years of LHC operation. They are now installed on the ATLAS detector and are operating during cosmic ray commissioning runs.
We propose to use part of the muon spectrometer of the L3 detector at LEP, CERN, to measure the c... more We propose to use part of the muon spectrometer of the L3 detector at LEP, CERN, to measure the cosmic ray muon spectrum in the momentum range between 20 and 2000 GeV/c with high precision. In addition we shall get the angular dependence, the charge ratio, and the time variations of the muon momentum spectrum, as well as multimuon events.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1991
The honeycomb strip chamber (H SC) is a new position sensitive detector. It consists of a stack o... more The honeycomb strip chamber (H SC) is a new position sensitive detector. It consists of a stack of folded foils, forming a rigid honeycomb structure. In the centre of each hexagonal cell a wire is strung. Conducting strips on Ihe foils, perpendicular lo the wires, pick up the induced avalanche charge. Test results of a prototype show that processing the signals from three adjacent strips nearest to the track gives a spatial resolution better than 64 for perpendicular incident tracks. The chamber performance is only slightly affected by a magnetic field.
Conference Record of the 1991 IEEE Nuclear Science Symposium and Medical Imaging Conference
ABSTRACT Summary form only given. The Honeycomb Strip Chamber is a new segmented-cathode proporti... more ABSTRACT Summary form only given. The Honeycomb Strip Chamber is a new segmented-cathode proportional chamber made from foil with conductive strips. The foil is folded perpendicular to the strips into a ribbon foil. Two of these foils form a layer of honeycomb cells; a wire is strung in the center. An eight-layer prototype has been constructed. The position resolution could be measured by an analysis of track residuals. Results better than σ=64 μm per plane were obtained for perpendicular tracks
Zeitschrift für Physik C: Particles and Fields, 1995
The total punchthrough probability of showers produced by negative pions, positive pions, positiv... more The total punchthrough probability of showers produced by negative pions, positive pions, positive kaons and protons, has been measured as a function of depth in an absorber in a magnetic field ranging from 0 to 3 Tesla. The incident particle momentum varied from 10 to 300 GeV/c. The lateral shower development and particle multiplicity at several absorber depths have been determined. The measure ments are compared with the predictions of Monte Carlo simulation programs.
and placement strategy 9.4 Infrastructure and detector services 9.4.1 Civil engineering 9.4.2 Ele... more and placement strategy 9.4 Infrastructure and detector services 9.4.1 Civil engineering 9.4.2 Electrical power distribution 9.4.3 Airconditioning and cooling systems 9.4.4 Gas distribution 9.4.5 Cryogenic systems 9.4.6 Racks and cables 9.4.7 Drag-chains and mobile services 9.4.8 Grounding and electromagnetic compatibility 9.5 Support and access structures 9.5.1 Feet and rail system 9.5.2 Trucks 9.5.3 Surrounding structures (HS and HO) 9.5.4 Muon barrel access structures 9.5.5 Big wheels 9.6 Detector installation 9.6.1 Phase 1: infrastructure in the main cavern, feet and rails 9.6.2 Phase 2: barrel calorimetry and barrel toroid 9.6.3 Phase 3: end-cap calorimeters and muon barrel chambers 9.6.4 Phase 4: muon big wheels, inner detector and completion of muon barrel 9.6.5 Phase 5: end-cap toroid magnets and muon small wheels 9.6.6 Phase 6: beam-pipe and forward shielding 9.7 Access and detector opening 9.7.1 Access scenarios 9.7.2 Movement system 9.8 Beam-pipe 9.9 Safety in ATLAS 9.9.1 Organisation of safety 9.9.2 Access control 9.9.3 Safety systems 9.9.4 Detector safety system 9.9.5 Safety during operation 9.10 Interface to the LHC machine
The Pierre Auger Observatory, located on a vast, high plain in western Argentina, is the world's ... more The Pierre Auger Observatory, located on a vast, high plain in western Argentina, is the world's largest cosmic ray observatory. The objectives of the Observatory are to probe the origin and characteristics of cosmic rays above 10 17 eV and to study the interactions of these, the most energetic particles observed in nature. The Auger design features an array of 1660 water Cherenkov particle detector stations spread over 3000 km 2 overlooked by 24 air fluorescence telescopes. In addition, three high elevation fluorescence telescopes overlook a 23.5 km 2 , 61-detector infilled array with 750 m spacing. The Observatory has been in successful operation since completion in 2008 and has recorded data from an exposure exceeding 40,000 km 2 sr yr. This paper describes the design and performance of the detectors, related subsystems and infrastructure that make up the Observatory.
The L3+C muon detector at the CERN electron-positron collider, LEP, is used for the detection of ... more The L3+C muon detector at the CERN electron-positron collider, LEP, is used for the detection of very-high-energy cosmic γ-ray sources through the observation of muons of energies above 20, 30, 50 and 100 GeV. Daily or monthly excesses in the rate of single-muon events pointing to some particular direction in the sky are searched for. The periods from mid July to November 1999, and April to November 2000 are considered. Special attention is also given to a selection of known γray sources. No statistically significant excess is observed for any direction or any particular source.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001
An emulsion spectrometer has been built and tested with pion beams in a 0.7 T magnetic field. A m... more An emulsion spectrometer has been built and tested with pion beams in a 0.7 T magnetic field. A momentum resolution, ∆P/P = 13% ± 1%, has been obtained for 5 and 10 GeV/c particles.
Laboratoire d&amp... more Laboratoire d'Annecy le Vieux de Physique des Particules.
We propose to complement the tracking devices of the HI experiment at the HERA ep-collider with h... more We propose to complement the tracking devices of the HI experiment at the HERA ep-collider with high resolution position sensitive detectors close to the beam line in the central and backward region. These detectors will improve the physics potential of the HI ...
It is expected that the peak luminosity delivered by the accelerator will increase to over 300 × ... more It is expected that the peak luminosity delivered by the accelerator will increase to over 300 × 10 30 cm −2 s −1. One of the upgraded systems is the Central Track Trigger (CTT). The CTT uses the Central Fiber Tracker (CFT) and Preshower detectors to identify central tracks with pT > 1.5 GeV at the first trigger level. Track candidates are formed by comparing fiber hits to predefined track equations. In order to minimize latency, this operation is performed in parallel using combinatorial logic implemented in FPGAs. Limited hardware resources prevented the use of the full granularity of the CFT. This leads to a high fake track rate as the occupancy increases. In order to mitigate the problem, new trackfinding hardware was designed and commissioned. We report on the upgrade and the improved performance of the CTT system.
This paper describes the electronics used for the ATLAS monitored drift tube (MDT) chambers. Thes... more This paper describes the electronics used for the ATLAS monitored drift tube (MDT) chambers. These chambers are the main component of the precision tracking system in the ATLAS muon spectrometer. The MDT detector system consists of 1,150 chambers containing a total of 354,000 drift tubes. It is capable of measuring the sagitta of muon tracks to an accuracy of 60 µm, which corresponds to a momentum accuracy of about 10% at p T = 1 TeV. The design and performance of the MDT readout electronics as well as the electronics for controlling, monitoring and powering the detector will be discussed. These electronics have been extensively tested under simulated running conditions and have undergone radiation testing certifying them for more than 10 years of LHC operation. They are now installed on the ATLAS detector and are operating during cosmic ray commissioning runs.
We propose to use part of the muon spectrometer of the L3 detector at LEP, CERN, to measure the c... more We propose to use part of the muon spectrometer of the L3 detector at LEP, CERN, to measure the cosmic ray muon spectrum in the momentum range between 20 and 2000 GeV/c with high precision. In addition we shall get the angular dependence, the charge ratio, and the time variations of the muon momentum spectrum, as well as multimuon events.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1991
The honeycomb strip chamber (H SC) is a new position sensitive detector. It consists of a stack o... more The honeycomb strip chamber (H SC) is a new position sensitive detector. It consists of a stack of folded foils, forming a rigid honeycomb structure. In the centre of each hexagonal cell a wire is strung. Conducting strips on Ihe foils, perpendicular lo the wires, pick up the induced avalanche charge. Test results of a prototype show that processing the signals from three adjacent strips nearest to the track gives a spatial resolution better than 64 for perpendicular incident tracks. The chamber performance is only slightly affected by a magnetic field.
Conference Record of the 1991 IEEE Nuclear Science Symposium and Medical Imaging Conference
ABSTRACT Summary form only given. The Honeycomb Strip Chamber is a new segmented-cathode proporti... more ABSTRACT Summary form only given. The Honeycomb Strip Chamber is a new segmented-cathode proportional chamber made from foil with conductive strips. The foil is folded perpendicular to the strips into a ribbon foil. Two of these foils form a layer of honeycomb cells; a wire is strung in the center. An eight-layer prototype has been constructed. The position resolution could be measured by an analysis of track residuals. Results better than σ=64 μm per plane were obtained for perpendicular tracks
Zeitschrift für Physik C: Particles and Fields, 1995
The total punchthrough probability of showers produced by negative pions, positive pions, positiv... more The total punchthrough probability of showers produced by negative pions, positive pions, positive kaons and protons, has been measured as a function of depth in an absorber in a magnetic field ranging from 0 to 3 Tesla. The incident particle momentum varied from 10 to 300 GeV/c. The lateral shower development and particle multiplicity at several absorber depths have been determined. The measure ments are compared with the predictions of Monte Carlo simulation programs.
and placement strategy 9.4 Infrastructure and detector services 9.4.1 Civil engineering 9.4.2 Ele... more and placement strategy 9.4 Infrastructure and detector services 9.4.1 Civil engineering 9.4.2 Electrical power distribution 9.4.3 Airconditioning and cooling systems 9.4.4 Gas distribution 9.4.5 Cryogenic systems 9.4.6 Racks and cables 9.4.7 Drag-chains and mobile services 9.4.8 Grounding and electromagnetic compatibility 9.5 Support and access structures 9.5.1 Feet and rail system 9.5.2 Trucks 9.5.3 Surrounding structures (HS and HO) 9.5.4 Muon barrel access structures 9.5.5 Big wheels 9.6 Detector installation 9.6.1 Phase 1: infrastructure in the main cavern, feet and rails 9.6.2 Phase 2: barrel calorimetry and barrel toroid 9.6.3 Phase 3: end-cap calorimeters and muon barrel chambers 9.6.4 Phase 4: muon big wheels, inner detector and completion of muon barrel 9.6.5 Phase 5: end-cap toroid magnets and muon small wheels 9.6.6 Phase 6: beam-pipe and forward shielding 9.7 Access and detector opening 9.7.1 Access scenarios 9.7.2 Movement system 9.8 Beam-pipe 9.9 Safety in ATLAS 9.9.1 Organisation of safety 9.9.2 Access control 9.9.3 Safety systems 9.9.4 Detector safety system 9.9.5 Safety during operation 9.10 Interface to the LHC machine
The Pierre Auger Observatory, located on a vast, high plain in western Argentina, is the world's ... more The Pierre Auger Observatory, located on a vast, high plain in western Argentina, is the world's largest cosmic ray observatory. The objectives of the Observatory are to probe the origin and characteristics of cosmic rays above 10 17 eV and to study the interactions of these, the most energetic particles observed in nature. The Auger design features an array of 1660 water Cherenkov particle detector stations spread over 3000 km 2 overlooked by 24 air fluorescence telescopes. In addition, three high elevation fluorescence telescopes overlook a 23.5 km 2 , 61-detector infilled array with 750 m spacing. The Observatory has been in successful operation since completion in 2008 and has recorded data from an exposure exceeding 40,000 km 2 sr yr. This paper describes the design and performance of the detectors, related subsystems and infrastructure that make up the Observatory.
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Papers by Thei Wijnen