The PIBETA project at PSI, Switzerland, is a program of measurements with the aim of making a precise determination of the pi+ -> pi0 e+ nu (PIBETA) decay rate, which provides a new constraint on the Cabibbo-Kobayashi-Masakava matrix element Vud. The PIBETA decay is measured with a stopped pion beam and normalized to pi+ -> e+ nu events. The heart of the detector is a 3pi spherical calorimeter consisting of 240 pure CsI crystals. Details of the design, construction and commissioning of the detector are described and preliminary results of the 1999 data taking with about 1% accuracy in the PIBETA branching ratio are reported.
Authors:PIBETA Collaboration
Proposed speaker: Stefan Ritt
Contact person:Stefan Ritt
(Paul Scherrer Institute),
Stefan.Ritt@psi.ch
Sessions: PA-12 New Detectors and Techniques /
Supporting papers:
Notes:
The BTeV program at the Tevatron is proposed to do a complete study of CP violation, mixing and rare decays in the b and c systems. The detector is triggered primarily on detached vertices from heavy flavor decays sensed in a pixel detector. Particles are tracked using straw tubes and silicon. Particle identification is accomplished in a RICH detector using gaseous and aerogel radiators. A PbWO4 electromagnetic calorimeter provides photon detection and electron identification. A muon system provides muon identification as well as a redundant trigger. The most relevant properties of these subsystems are discussed
Authors:BTeV Collaboration
Proposed speaker: Sheldon Stone
Contact person:Sheldon Stone
(Syracuse University),
stone@phy.syr.edu
Sessions: PA-12 New Detectors and Techniques / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The CMS crystal calorimeter, comprising about 80.000 scintillating lead tungstate crystals read out by a avalanche photodiodes in the barrel and vacuum phototriodes in the endcap, is designed to give excellent energy resolution in the LHC environment. We are now entering in the construction phase. We present here a status report on the project, with recent results on tests beam, crystal production and photodetector choice.
Authors:CMS Collaboration
Proposed speaker: Francois Zach
Contact person:francois zach
(Institut de Physique nucleaire de Lyon),
zach@in2p3.fr
Sessions: PA-12 New Detectors and Techniques /
Supporting papers:
Notes:
Abstract A system of 18 detector modules, designed for the use in the forward-backward tracker of the CMS experiment, has been tested in a high intensity pion beam at the Paul-Scherrer-Institut (Villigen, CH). Each module was equipped with four Micro Strip Gas Chamber (MSGC) substrates and a large area Gas Electron Multipliers (GEM) as second amplification stage, making up for a total number of 36.864 channels. The robustness of the detector modules when operated within an LHC-like environment was studied. Voltage settings yielding 98% detection efficiency for minimum ionising particles were set, and the number of strips lost over a period of two weeks under permanent irradiation with a particle flux of 4 x 10^3Hz/mm2 was recorded. The corresponding loss of strips was found to be well below the ceiling of 10% of the total number of channels read out. This limit was set by an extrapolation to the LHC running period of ten years, and the requirements of the CMS experiment on detection efficiency. A signal-to-noise ratio of 100, exceeding the requirements by a factor of three, has been achieved and provides a comfortable safety margin for long term operation.
Authors:On behalf of the CMS forward MSGC community.
Proposed speaker: Dirk Macke
Contact person:Dirk Macke
(RWTH Aachen),
macke@physik.rwth-aachen.de
Sessions: PA-12 New Detectors and Techniques / PL-14 Future Accelerators
Supporting papers:
Notes:
Future experiments are using silicon detectors in a high radiation environment and in high magnetic fields. The radiation tolerance of the silicon detectors improves by cooling them to temperatures below 180 K. At low temperatures the mobility increases, which leads to larger deflections of the charge carriers in high magnetic fields. A good knowledge of the Lorentz angle is needed for design and operation of future experiments. We present measurements of the Lorentz angle in irradiated and non-irradiated silicon detectors between 77 K and 300K. These results are found to be in strong disagreement with standard simulations.
Authors:W. de Boer, J. Bol, E. Grigoriev, F. Hauler, S. Heising, O. Herz, L. Jungermann, R. Keranen, F. Roederer, T. Schneider
Proposed speaker: W. de Boer
Contact person:Wim de Boer
(Univ. Karlsruhe),
wim.de.boer@cern.ch
Sessions: PA-12 New Detectors and Techniques / PL-14 Future Accelerators
Supporting papers:
Notes:The results will be updated, if new Higgs mass limits from LEP become available.
We report the main results of the BTeV silicon pixel detector beam test carried out at Fermilab during the 1999-2000 fixed target run. The tests were performed using a 227 GeV/c pion beam incident on a six-plane silicon microstrip telescope. Several single-chip silicon pixel planes were placed in the middle of the apparatus. Spatial resolution was studied vs sensor bias, readout threshold, and applied magnetic field. In addition, interactions were observed in an upstream 2.2 mm thick diamond target.
Authors:J.A. Appel, J.N. Butler, G. Cardoso, H. Cheung, G. Chiodini, D.C. Christian, E.E. Gottschalk, et al
Proposed speaker: J.A. Appel
Contact person:Jeffrey A. Appel
(Fermilab),
appel@fnal.gov
Sessions: PA-12 New Detectors and Techniques / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
A radiation hard optical readout system designed for the ATLAS Semiconductor Tracker (SCT) is described. Two independent versions of the front-end optical package housing two VCSEL emitters and an epitaxial Si PIN photodiode have been irradiated with neutron fluences over 10^15 n.cm^-2, the level encountered in the ATLAS pixel detector. Environmental tests have been performed down to -20 degC. Extensive radiation and lifetime tests have also been carried out on the opto-electronic components and the front-end VCSEL driver and timing/ control ASICs. Bit error rate, cross-talk and single event upset measurements using irradiated devices show that the system easily meets the performance specification.
Authors:D.G.Charlton et al. (Birmingham, Oxford, RAL, CERN, Taipei)
Proposed speaker: J.D.Dowell (Birmingham)
Contact person:John D Dowell
(University of Birmingham),
j.d.dowell@bham.ac.uk
Sessions: PA-12 New Detectors and Techniques /
Supporting papers:
Notes:
The DIRC is a novel type of Cherenkov imaging device that has been developed, built and installed as part of the BaBar detector at the asymmetric B-factory PEP-II at SLAC. The DIRC is based on total internal reflection of Cherenkov photons produced and guided within thin, rectangular quartz bars covering the barrel region of BaBar. The photon detector is an array of photomultiplier tubes covering the photon phase space at the backward end of the bars. The talk introduces the DIRC principle and presents performance results on the Cherenkov angle measurement and on particle identification.
Authors:DIRC Collaboration
Proposed speaker: Andreas Hocker
Contact person:Andreas Hocker
(Laboratoire de l'Accelerateur Lineaire),
hoecker@lal.in2p3.fr
Sessions: PA-12 New Detectors and Techniques / PL-01a New Results from e+e- B-factories : BABAR
Supporting papers:
Notes:
To measure luminosity after HERA upgrade in 2000, the H1 collaboration has chosen to build a quartz-fibre/tungsten Cerenkov calorimeter, based on a technology suitable for high radiation level environments. We present the results of the beam tests performed at the CERN SPS in 1999. An energy resolution of 19 %/sqrt{E} for electrons from 8 to 100 GeV has been measured. The combination of tungsten absorbers and a particular fibre orientation leads to very narrow apparent showers which translates into a position resolution of 5 mm/sqrt{E}.
Authors:B. Andrieu, E. Barrelet, F. Bonnin, V. Boudry, S. Ferron, I. Herynek, J. Hladky, F. Moreau, P. Smirnov, Y. Soloviev, A.E. Specka, F. Zomer
Proposed speaker: B. Andrieu
Contact person:Bernard Andrieu
(Ecole Polytechnique),
andrieu@in2p3.fr
Sessions: PA-12 New Detectors and Techniques /
Supporting papers:
Notes:
The status of chemical vapor deposited diamond as a highly radiation-hard sensor material for pixel detectors will be described. Recent test beam results using CMS pixel configurations and electronics will be highlighted. Side-by-side comparison will be made between the performance including efficiency, pulse height and spatial resolution of diamond and silicon sensors measured under similar conditions. Results with ATLAS pixel configurations and electronics and recent studies of the radiation hardness and signal characteristics of diamond sensors will also be presented.
Authors:RD42 Collaboration
Proposed speaker: Steve Schnetzer
Contact person:Steve R Schnetzer
(Rutgers University),
steves@physics.rutgers.edu
Sessions: PA-12 New Detectors and Techniques / PL-07b Search for New Particles and New Phenomena (Results from Hadron Colliders)
Supporting papers:
Notes:
The ATLAS collaboration is presently building its liquid argon electromagnetic calorimeter with accordion shape. We will describe the calorimeter and report on its construction. The first barrel and end cap modules, equipped with a presampler, were tested at CERN in an electron beam. Preliminary results (energy and position resolution) will be presented.
Authors:ATLAS
Proposed speaker: Robert ZITOUN
Contact person:Robert ZITOUN
(LAPP, Annecy, France),
zitoun@lapp.in2p3.fr
Sessions: PA-12 New Detectors and Techniques /
Supporting papers:
Notes:
The LHC at CERN will provide proton-proton collisions at a centre-of-mass energy of 14 TeV and a bunch crossing interval of 25 ns. At design luminosity this will result in an inelastic pp interaction rate of ~1 GHz. The CMS experiment will have a multi-level trigger system in order to reduce this rate to about 100 Hz for events written to a mass storage. This online data selection is an unprecedented experimental challenge. The architecture and the technology of the level-1 muon trigger are described. The level-1 and level-2 trigger algorithms are presented and the expected performance is summarized.
Authors:CMS
Proposed speaker: Norbert Neumeister
Contact person:Norbert Neumeister
(CERN),
Norbert.Neumeister@cern.ch
Sessions: PA-12 New Detectors and Techniques /
Supporting papers:
Notes:
In the next generation of high energy experiments, the Resistive Plate Chambers (RPC's) will operate in a hostile radiation environment. To this purpose, we operated RPC's and front-end boards in the thermal column of the Triga Mark 2 Reactor of the Univesrity of Pavia and in Gamma Irradiation Facilities of Cern and the University of Bari. We present our results on: a- detector sensitivity to neutrons and low energy gamma rays; b- sensitivity to neutrons and low energy gamma rays of the front end electronics; c- ageing of the materials used as major parts of the detector.
Authors:Bari Pavia collaboration
Proposed speaker: Sergio P. Ratti
Contact person:Sergio P. Ratti
(Universita' di Pavia),
sergio.ratti@pv.infn.it
Sessions: PA-12 New Detectors and Techniques /
Supporting papers:
Notes:
Low resistivity active pixel sensors have been developped in order to detect minimum ionising particles. Exposure of the first prototype to a high energy pion beam has revealed large signal/noise ratio and excellent detection efficiency, thus demonstrating that this new technique has a wide range of applications in High Energy Physics experiments, and looks particularly attractive for future vertex detectors.
Authors:collaboration of IReS-Strasbourg and LEPSI-Strasbourg
Proposed speaker: Marc WINTER
Contact person:Marc WINTER
(Insitut de Physique Subatomique),
marc.winter@ires.in2p3.fr
Sessions: PA-12 New Detectors and Techniques / PL-14 Future Accelerators
Supporting papers: "A Monolithic Active Pixel Sensor for Charged Particle Tracking and Imaging using Standard VLSI CMOS Technology" J.D.Berst et al., Preprint LEPSI-99-15
Notes:
The D0 collaboration is nearing completion of a large detector upgrade designed to operate for the 2001 Run II at the Fermilab Tevatron. This new detector includes: an 800k channel silicon tracker; a novel 80k scintillating fiber tracker and preshower detectors; a 2T superconducting solenoid; a new forward muon system; as well as new front-end and data acquisition electronics designed to handle the tenfold increase in luminosity and the changed bunch structure. We present results on the performance of some of the detector subsystems, together with the expected physics program and capabilities of the detector for Run II and beyond.
Authors:The DZero Collaboration
Proposed speaker: To be decided by the DZero Collaboration
Contact person:Bernard G. Pope
(Michigan State University),
pope@pa.msu.edu
Sessions: PA-12 New Detectors and Techniques /
Supporting papers:
Notes:
The D0 collaboration is completing production of a 793,000 channel silicon strip tracking system for the D0 upgrade. The tracker consists of 768 ladder and wedge assemblies including both single and double sided detectors. The production process includes burn-in of electronics, mechanical assembly under coordinate measuring machines, wirebonding, repair of bad channels, detector burn-in, laser testing, and final assembly. We will describe observed failure modes of the detectors, including microdischarge and lithography defects. We will present results of the production and testing process, and describe the anticipated performance of the detector. Lessons for future production of large scale tracking systems will be discussed.
Authors:The DZero Collaboration
Proposed speaker: To be decided by the DZero Collaboration
Contact person:Bernard G. Pope
(Michigan State University),
pope@pa.msu.edu
Sessions: PA-12 New Detectors and Techniques /
Supporting papers:
Notes:
Recently, the CMS collaboration has decided to equip the central tracker exclusively with silicon detectors. The new layout and its performance will be discussed.
Authors:CMS-Collaboration
Proposed speaker: K. Freudenreich
Contact person:Klaus Freudenreich
(federal institute of technology),
Klaus.Freudenreich@cern.ch
Sessions: PA-12 New Detectors and Techniques / PL-14 Future Accelerators
Supporting papers:
Notes:
ATHENA [1], one of 3 experiments at the new low energy antiproton facility at CERN (AD [2]), is designed for testing fundamental physic principles (CPT, Gravitation) to a high degree of precision by comparing cold antihydrogen to hydrogen. To monitor production and spectroscopy of the antihydrogen atoms, a detector dedicated for the endproducts of antihydrogen annihilations was developed. To meet the requirements of low temperature operation (77 K) in a high magnetic field, compact size, low power consumption and high granularity, a combination of two layers of each 16 double sided Si-micro-strip modules (16 cm long) was chosen, surrounded by 192 pure CsI crystals, which are read by UV sensitive photo diodes. The frontend electronics (working point 77 K), realised in VLSI CMOS technique, features a self triggering capability of the independent sub detectors.
Authors:The ATHENA collaboration
Proposed speaker: C. Regenfus
Contact person:Christian Regenfus
(CERN),
regenfus@cern.ch
Sessions: PA-12 New Detectors and Techniques /
Supporting papers: [1] M. Holzscheiter et al. (the ATHENA collaboration): Antihydrogen production and precision experiments. Cern Doc. SPSLC 96-47/P 302, 1996. [2] S. Maury at al.: The Antiproton Decelerator project. Cern Doc. CERN/PS 96-43 (AR), 1996.
Notes:
The 64-channel Multianode Photo Multiplier (MAPMT) has been evaluated as a possible photo detector for the LHCb Ring Imaging Cherenkov (RICH) detector. An array of 3x3 MAPMTs has been assembled and mounted onto the RICH\1 prototype vessel. The MAPMT was read out at LHC speed (40 MHz) with the APVm chip. We will present data taken with charged particle beams at CERN and show that Cherenkov light can be detected over the full area of the closely packed MAPMTs by means of quartz lenses focusing the light onto the sensitive area of the device. The number of observed photons is in agreement with the expectations. Results from LED light scans measure the homogeneity of the light yield over the sensitive area. We have also exposed the MAPMT/lens to charged particles. The behaviour of the MAPMT in magnetic fields has been investigated. The results show that the MAPMT meets the performance requirements for charged particle identification in the LHCb RICH detector. The MAPMT has been chosen as the backup photo detector for LHCb.
Authors:LHCb RICH
Proposed speaker: F. Muheim
Contact person:Franz Muheim
(University of Edinburgh),
f.muheim@ed.ac.uk
Sessions: PA-12 New Detectors and Techniques /
Supporting papers:
Notes:
KLOE, a new state of art detector recently commissioned for physiscs operation at DA$\Phi$NE, has many innovative interesting features, especially in the DAQ and Trigger areas. Custom electronics asserts a trigger in a 2 microseconds decision time and distributes it to the FEE with a 50 ps time resolution. Data are read out using 10 front-end data acquistion chains and sent to a farm of online servers through a FDDI Gigaswitch. This design of the KLOE DAQ system allows us to manage an input data rate as high as 50 Mbytes/s, and is completely scalable by extending the number of computers connected to the switch. The experience from processing 2.3 billion triggers and 4200 Gbytes of data on tape will be presented.
Authors:The KLOE Collaboration
Proposed speaker: P. Branchini (ICHEP ID 2553)
Contact person:Juliet Lee-Franzini (ICHEP ID 1790)
(Laboratori nazionali di Frascati),
Juliet.leefranzini@lnf.infn.it
Sessions: PA-12 New Detectors and Techniques / PL-02 CP Violation and Rare Decays ( Kaon, Muon )
Supporting papers:
Notes:(024)
Over the last few years lot of progress has been made in the understanding of the operation of CMS silicon detectors in a harsh enviroment of LHC. The talk will review the main characteristics and performances of the CMS Silicon Sensors that are the outcome of a considerable R&D effort produced in the past years. The present design and technological process for the manufacturing of about 200 sqm silicon tracker appear to be well suited for running our system up to 10 years at LHC.
Authors:CMS Silicon Tracker Collaboration
Proposed speaker: Gian mario Bilei
Contact person:Gian Mario Bilei
(INFN Perugia),
gianmario.bilei@pg.infn.it
Sessions: PA-12 New Detectors and Techniques / PL-14 Future Accelerators
Supporting papers:
Notes: (112)
The Alpha Magnetic Spectrometer is a detector designed to search for anti-matter and dark matter by the analysis of cosmic rays in space. Its installation is scheduled on the International Space Station (ISSA) for an operational period of 3 years. A precursor flight on a Space Shuttle occured in 1998 with a Silicon surface of 2.2 m2. The construction of the 7 m2 second phase is starting. The AMS silicon tracker has a large dynamic range of up to 100 MIPS for dE/dX measurement. We discuss the design,construction and performance of the detector.
Authors:The AMS tracker collaboration
Proposed speaker: Divic Rapin
Contact person:Divic J Rapin
(University of Geneva),
Divic.Rapin@physics.unige.ch
Sessions: PA-12 New Detectors and Techniques /
Supporting papers:
Notes:
The HERA-B experiment at DESY is a large acceptance spectrometer to detect B mesons produced in a fixed target p(920 GeV) nucleus interaction. The experiment is designed to reconstruct 4-5 interactions per event using a silicon vertex detector, an inner microstrip gas chamber with gas electron multiplier and an outer large volume honeycomb drift chamber. All three detectors are operated in a radiation environment similar to that of the planned LHC experiments. The detector designs and technologies will be reviewed in the context of performance measurements. Track and vertex reconstruction will be discussed using data from the first year of common operation.
Authors:HERA-B
Proposed speaker:
Contact person:Reinhard Eckmann
(DESY),
eckmann@desy.de
Sessions: PA-12 New Detectors and Techniques /
Supporting papers:
Notes:
End of abstracts for PA-12 New Detectors and Techniques