Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session C13: High Energy Instrumentation |
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Sponsoring Units: DPF Chair: Andrew White, University of Texas at Arlington Room: Hyatt Regency Jacksonville Riverfront City Terrace 9 |
Saturday, April 14, 2007 1:30PM - 1:42PM |
C13.00001: Detector for $6.3 < \eta < 7.7$ (0.21$^{\circ}$ to 0.051$^{\circ}$) for 14 TeV p-p reactions Edwin Norbeck, Paul Debbins, Yasar Onel Diffractive events in high-energy p-p reactions are characterized by rapidity gaps, angular regions in which there are no reaction products. Ideally, they should be studied by an experiment that detects particle over the entire sphere. With the CMS experiment at the LHC (large hadron collider), particles in the range of $6.3 < \eta < 7.7$ (0.21$^{\circ}$ to 0.051$^{\circ})$ are intercepted by the TAS, a copper cylinder of diameter 50 cm and length 180 cm that shields the following superconducting magnet. The TAS, and the detectors in it, extend to $\eta$ = 5.0, but for $\eta < 6.3$ the particles are intercepted by the CASTOR and HF detectors in CMS. The TAS is provided with a horizontal 20 cm $\times$ 20 cm slot located 20 cm (1.3 nuclear interactions lengths) from the front. When bake out of the beam pipe through the TAS is required, the entire copper cylinder is heated to 250$^{\circ}$C for 24 hrs. Showers produced in the front part of the TAS make \v{C}erenkov light in sheets of quartz fibers located in the slot. The fibers cover four quadrants, left-right and top-bottom. The fibers are collected into four bundles that run in channels along the side of the TAS to photomultiplier tubes at the rear where they are shielded from reaction products. [Preview Abstract] |
Saturday, April 14, 2007 1:42PM - 1:54PM |
C13.00002: The CDF II eXtremely Fast Tracker Upgrade Heather Gerberich The CDF II eXtremely Fast Tracker (XFT) is the trigger track processor which reconstructs charged particle tracks in the transverse plane of the CDF II central outer tracking chamber. The XFT tracks are also extrapolated to the electromagnetic calorimeter and muon chambers and are associated to electromagnetic clusters and muon stubs to generate trigger electron and muon candidates. The steady increase of the Tevatron instantaneous luminosity demanded an upgrade of the system to cope with the higher occupancy of the chamber. The XFT upgrade improves track reconstruction by including additional data from the stereo layers of the chamber, which allows a reduction in the level of fake tracks as well as a full three dimensional reconstruction of the tracks. A review of this upgrade is presented. [Preview Abstract] |
Saturday, April 14, 2007 1:54PM - 2:06PM |
C13.00003: Performance of Endcap Muon System of the Compact Muon Solenoid Yuriy Pakhotin The Endcap Muon System of the Compact Muon Solenoid (CMS) detector for the Large Hadron Collider will provide muon identification, momentum measurement, and Level-1 trigger. A $60^\circ$-sector of CMS was taking cosmic ray data in summer-fall 2006. In this report, we present results of muon detection efficiency and precision as obtained in situ during these tests. [Preview Abstract] |
Saturday, April 14, 2007 2:06PM - 2:18PM |
C13.00004: Identification of Photon Conversions in the ATLAS detector David Joffe Reconstruction of photon conversions in the ATLAS detector at the LHC will be crucial for proper identification of electrons and photons from physics events. The positions of reconstructed conversions may also be used to map out material in the inner detector. This talk will illustrate the methods used in the ATLAS software for identifying and reconstructing conversions using available track and calorimeter information. The efficiency of the conversion identification algorithms will be discussed, as well as the effect of conversions on physics measurements. [Preview Abstract] |
Saturday, April 14, 2007 2:18PM - 2:30PM |
C13.00005: Study of KamLAND Liquid Scintillator response to low energy electrons with Compton Spectrometer Oleg Perevozchikov The measurement of the liquid scintilaltor non-linearity plays an important role for the low threshold scintillator detectors. Direct measurements of such non-linearity is very difficult and sometime is not possible, especially for neutrino detectors like KamLAND. UT group has built high resolution Compton Spectrometer to study the non-linear response from liquid scintillator to low energy electrons. Our focus is the characterized KamLAND scintillator non-linearity for the incoming solar phase of the experiment. In my presentation I would like to explain the procedure of the measurements and present obtained results. I will present Monte-Carlo results of Cherenkov light contribution to the KamLAND Liquid Scintillator Response as well. [Preview Abstract] |
Saturday, April 14, 2007 2:30PM - 2:42PM |
C13.00006: A Fast, Compact, Segmented Tungsten/SciFi Calorimeter Ronald McNabb, Jason Crnkovic, Kevin Lynch, David Hertzog The new E969 muon g-2 experiment at BNL will need to run at significantly higher stored muon rate to collect the necessary statistics in a reasonable time. The higher instantaneous decay electron rate will require a new segmented calorimeter to keep the systematic error from pileup small. A fast, tungsten-scintillating fiber calorimeter with PMT readout has been designed for this purpose. The high density of tungsten results in compact showers, which are necessary both to distinguish multiple simultaneous showers and to satisfy strict space constraints. Beam tests and Monte Carlo simulations of a single calorimeter segment have been performed. Analysis of these studies indicates that the new design should satisfy the requirements of the g-2 experiment. [Preview Abstract] |
Saturday, April 14, 2007 2:42PM - 2:54PM |
C13.00007: ABSTRACT WITHDRAWN |
Saturday, April 14, 2007 2:54PM - 3:06PM |
C13.00008: Online Laser Monitoring for the CMS electromagnetic calorimeter: 2006 Test Beam Results Christopher Rogan The Compact Muon Solenoid (CMS) experiment is a general-purpose particle physics detector designed to exploit the physics of p-p collisions at a CM energy of 14 TeV at the Large Hadron Collider (LHC). The CMS electromagnetic calorimeter (ECAL) is composed of 76,000 lead tungstate (PWO$_{4})$ crystals. Although radiation resistant, light output of PWO$_{4}$ crystals displays a loss caused by the creation of color centers, which absorb a fraction of transmitted light. Subsequent recovery occurs due to color center annihilation, leading to periodic, dose-rate dependent light output variations. A laser based light monitoring system is designed to track variations of crystal's transparency and provide corrections for precision inter-calibrations, which are crucial for the CMS physics program. Crystal transparency is measured using laser pulses injected into the crystals via optical fibers. The laser monitoring system includes a blue light source and an optical fiber based light distribution system with reference PN diode readout. An online monitoring data analysis system was developed for the 2006 test beam effort, allowing variations in crystal transparencies to be analyzed in a quasi real-time. This talk describes software and DAQ infrastructure of the online monitoring data analysis system and its performance. The monitoring stability will also be discussed. [Preview Abstract] |
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