Bulletin of the American Physical Society
2008 APS April Meeting and HEDP/HEDLA Meeting
Volume 53, Number 5
Friday–Tuesday, April 11–15, 2008; St. Louis, Missouri
Session B12: Detectors II |
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Sponsoring Units: DPF Chair: Ray Cowan, Massachusetts Institute of Technology Room: Hyatt Regency St. Louis Riverfront (formerly Adam's Mark Hotel), St. Louis C |
Saturday, April 12, 2008 10:45AM - 10:57AM |
B12.00001: The Upgraded CDF II Fast Track Trigger Robert Forrest The CDF eXtremely Fast Tracker (XFT) trigger system reconstructs charged particle tracks transverse to the beam line using hit data from the axial layers of the central drift chamber. These tracks are then associated with activity in other detector elements to find electron and muon candidates for use in trigger decisions. The XFT system has been upgraded to make use of the existing stereo layers of the chamber. The upgrade improves fake rejection, as well as enabling three dimensional reconstruction and extrapolation of tracks at the trigger level. This results in a higher purity of selected events, and controls the non-linear growth of trigger rates with increasing instantaneous luminosity. We describe the upgraded XFT system and present preliminary results on its performance with collision data at various high instantaneous luminosities. [Preview Abstract] |
Saturday, April 12, 2008 10:57AM - 11:09AM |
B12.00002: Performance and Longevity Studies of the Silicon Detector of the CDF Experiment Roberto Martinez Ballarin, Oscar Gonzalez Lopez, Ignacio Redondo Fernandez The CDF Silicon Detector is a system devoted to make precision tracking and vertex measurements. The silicon detector is used in regular data taking, having collected more than 3.0 fb$^{-1}$ of data during the Run II of the Tevatron Collider at Fermilab. The silicon detector is exposed to extreme conditions of irradiation so it provides an exceptional opportunity to study the effects of a prolonged high-radiation environment on silicon sensors. In this talk we describe the tools and comment the results obtained at CDF to monitor and investigate the evolution of the silicon detector performance as radiation damage becomes more severe, specifically after the innermost layers of the detector have crossed the so-called inversion point. [Preview Abstract] |
Saturday, April 12, 2008 11:09AM - 11:21AM |
B12.00003: Study of Beam-Induced Radiation in the CMS Detector at the Large Hadron Collider Anil Singh, Pushpalatha Bhat, Suman Beri, Nikolai Mokhov The intense radiation environment at the Large Hadron Collider (CERN) at the design energy of $\sqrt s $=14 TeV and luminosity of 10$^{34}$ cm$^{-2}$ sec$^{-1}$ poses unprecedented challenges for safe operation and performance quality of the silicon tracker detectors in the CMS and ATLAS experiments. The silicon trackers are crucial for the physics at the LHC experiments, and the inner layers, being situated only a few centimeters from the interaction point, are most vulnerable to beam-induced radiation. We have recently carried out extensive monte carlo simulation studies using MARS program to estimate particle fluxes and radiation dose in the CMS silicon pixel and strip trackers from proton-proton collisions and from machine background such as beam-gas interactions and beam-halo. We have also studied some possible machine accident scenarios. We will present results on radiation dose, particle fluxes and spectra from these studies and discuss implications for radiation damage and performance of the CMS silicon tracker detectors. [Preview Abstract] |
Saturday, April 12, 2008 11:21AM - 11:33AM |
B12.00004: Performance of CMS Endcap Muon Chambers Victor Barashko In the Compact Muon Solenoid (CMS) Experiment, muon detection in the forward direction is accomplished by the Endcap Muon System comprised of 468 Cathode Strip Chambers (CSC). These detectors also provide fast muon trigger and give a precise measurement of the muon trajectory. We present results of the detector performance analysis based on the cosmic ray data collected by the CMS experiment in 2006, with about 8\% of the full system (36 CSCs) operating for a few months. We show that CMS CSCs identify 2-dimensional trigger primitives with 99.9\% efficiency. These segments, found by the CSC electronics in less than 500 ns after passing of a muon through the chambers, are the input information for the Level-1 muon trigger and, also, are a necessary condition for chamber raw data read-out by the Data Acquisition System. The spatial resolution per chamber is measured to be around 100-200 microns (CSC resolution depends on strip width, which varies for the chambers from 4 to 16 mm). In contrast to the earlier studies based on a total detector area typically limited to 0.01 sq.m. (efficiency) and 3 sq.m. (resolution), results presented in this report were obtained for many installed CSCs operating in situ over an area of 20 sq.m. (efficiency) and 60 sq.m. (spatial resolution). [Preview Abstract] |
Saturday, April 12, 2008 11:33AM - 11:45AM |
B12.00005: Beam Test Results for ATLAS Muon Micromegas Woochun Park MicroMegas (MicroMEsh GAseous Structure) technology is a promising candidate to replace the ATLAS muon tracking and trigger chambers in the end-cap inner layer and in the highest rapidity region of the middle layer for a future Super-LHC version of the experiment. A small prototype was built and evaluated in a beam test performed at the CERN H6 in November 2007. Some preliminary results on the performance are presented. [Preview Abstract] |
Saturday, April 12, 2008 11:45AM - 11:57AM |
B12.00006: Track-based alignment of the CMS muon detector Jim Pivarski The outermost layer of the CMS experiment measures muon tracks with over 700 independent tracking chambers, mounted on modular wheels and disks. These supports can shift and flex under the magnetic force of the CMS solenoid, so the positions and orientations of the chambers must be determined under operating conditions. Two methods will be used to identify the chambers' true locations: a survey system built into the detector and a software-based optimization of tracks. We will discuss the latter, which poses interesting challenges due to the large amount of material between muon chambers. Proper alignment of the muon system is one of the most significant factors in muon momentum resolution above 1 TeV. [Preview Abstract] |
Saturday, April 12, 2008 11:57AM - 12:09PM |
B12.00007: Alignment of the Inner Detector of the ATLAS Experiment Sophio Pataraia The ATLAS Experiment is a general purpose detector that will operate at the Large Hadron Collider at CERN in Geneva, Switzerland. In order to achieve its physics goals, the ATLAS tracking requires that the position of the silicon detector elements have to be known to a precision better than about 10 micrometers. This precision can only be achieved by track based alignment algorithms. In this presentation the startup plans for the ATLAS Inner Detector are presented. This includes the implementation of the alignment algorithm in the overall computing model as well as tests of misaligned detector setups using simulated data. [Preview Abstract] |
Saturday, April 12, 2008 12:09PM - 12:21PM |
B12.00008: Test beam results from the CMS Zero Degree Calorimeters Jeffrey Wood The CMS Zero Degree Calorimeters are designed to measure forward neutrons and photons in TeV scale pp and heavy ion collisions. We will present test beam results from electron and pion beams in the energy range of 20-350 GeV. We will discuss the resolution and linearity of the detector as a function of energy. For pp collisions we expect to see protons with energies as high as the beam energy, 7TeV. This energy is 20 times larger than the highest available test beam energy and so calibration is a particular challange. Finally we will describe how we plan to use the detector for early physics measurements at the LHC. [Preview Abstract] |
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