Bulletin of the American Physical Society
2009 APS April Meeting
Volume 54, Number 4
Saturday–Tuesday, May 2–5, 2009; Denver, Colorado
Session B9: Instrumentation for High Energy Physics |
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Sponsoring Units: DPF Chair: Michael Strauss, University of Oklahoma Room: Governor's Square 11 |
Saturday, May 2, 2009 10:45AM - 10:57AM |
B9.00001: Studies of First Tracks in the CMS Pixel Detector Andrew York During 2008 the silicon pixel detector of the CMS experiment at LHC has participated in cosmic particle measurements which provided several 100 millions of charged muon tracks. This allowed commissioning of the reconstruction software and extensive data quality monitoring. Afterwards, detector alignment properties such as pixel residuals and pixel efficiencies were determined. I will discuss the detector studies during this talk. [Preview Abstract] |
Saturday, May 2, 2009 10:57AM - 11:09AM |
B9.00002: Advantages of Digital Calorimetry Edwin Norbeck, Burak Bilki, Yasar Onel A sampling calorimeter has absorber plates interleaved with particle detectors. Good energy resolution requires a large sampling fraction and detectors with excellent energy resolution. However, for a minimum ionizing particle (MIP) the energy lost in an absorber plate and detector is known. In this case the detector needs only to indicate the passage of the particle, a ``1'' or a zero, hence the name ``digital calorimeter.'' The transverse position resolution must be good enough so that usually only one MIP hits a detector pixel. If a MIP interacts to produce several MIPs, a computer program will track the particles back to the vertex to determine the number of MIPs in pixels near the vertex. A single MIP may be on the edge between two pixels and register in both, or it may be below threshold and pass through a pixel without being recorded. Elaborate computer programs, including particle flow algorithms, are needed to extract the energy from the digital data. A calorimeter with a shape of a cubic meter is being constructed that will consist of 40 layers with 10,000 pixels in each detector, for a total of 400,000 single-bit channels. This is an ``imaging'' calorimeter that will measure jet energies better than is possible with a conventional analog calorimeter. [Preview Abstract] |
Saturday, May 2, 2009 11:09AM - 11:21AM |
B9.00003: CMS-ECAL detector performance with 2008 data Jason Haupt The precision timing of the CMS-ECAL detector was determined and verified from 2008 beam data and with a laser monitoring system. This talk will discuss the data and the methods employed to accurately time in the detector with respect to collisions. [Preview Abstract] |
Saturday, May 2, 2009 11:21AM - 11:33AM |
B9.00004: Techniques for the Identification of Cosmic and Beam Halo Muons in the CMS ECAL Detector Michael Balazs Energetic cosmic muons or muons from beam halo can produce photons as they pass through the CMS Electromagnetic Calorimeter (ECAL) and fake secondaries from beam-beam interactions. The pattern of light for these photons in the ECAL is different from the pattern of light produced by secondaries. Secondaries from the interaction point hit a crystal approximately perpendicular to the face because the crystals in the ECAL are rotated such that they point back approximately to the interaction point. Muons from the beam halo, on the other hand, will transverse multiple crystals producing a distinctive pattern of light. In addition to the shower pattern, shower timing can be used to distinguish muon signals from the secondaries. The photons from cosmic muons will be asynchronous with the beam allowing them to removed while photons from beam halo muons will have a very specific time distribution determined by geometric factors with respect to the interaction time. These techniques will be discussed in this talk. [Preview Abstract] |
Saturday, May 2, 2009 11:33AM - 11:45AM |
B9.00005: Application of a Novel Multi-Pixel Solid State Photon Detector to the T2K P0D Daniel Ruterbories, Bruce Berger, David Warner, Robert Wilson The Pi-Zero sub-detector (P0D) of the T2K off-axis near detector (ND280) will utilize novel silicon-based photosensors. The MPPCs (Multi-Pixel Photon Counters) are a custom design manufactured for T2K by Hamamatsu Photonics. The P0D is designed to measure muon neutrino interactions on a water target. It is a highly-segmented detector with 10,400 photosensors instrumenting the fiber readout of 80 layers of plastic scintillator. In this presentation, we describe the photosensor performance requirements of the P0D, and we report on the results of an extensive electro-optical quality assurance procedure carried out on 11,000 devices at Colorado State University. [Preview Abstract] |
Saturday, May 2, 2009 11:45AM - 11:57AM |
B9.00006: Alignment of the ATLAS Inner Detector tracking system John Alison The CERN's Large Hadron Collider (LHC) is the world largest particle accelerator. It will collide two proton beams at an unprecedented center of mass energy of 14 TeV. ATLAS is equipped with a charge particle tracking system built on two technologies: silicon and drift tube based detectors, composing the ATLAS Inner Detector (ID). The alignment of the tracking system poses a challenge as one should solve a linear equation with almost 36,000 degrees of freedom. The required precision for the alignment of the most sensitive coordinates of the silicon sensors is just few microns. This limit comes from the requirement that the misalignment should not worsen the resolution of the track parameter measurements by more than 10{\%}. So far the proposed alignment algorithms are tested on several applications. We will present the outline of the alignment approach and results from Cosmic Ray runs and large scale computing simulation of physics samples mimicking the ATLAS operation during real data taking. The full alignment chain is tested using that stream and alignment constants are produced and validated within 24 hours. Cosmic ray data serves to produce an early alignment of the real ATLAS Inner Detector even before the LHC starts. [Preview Abstract] |
Saturday, May 2, 2009 11:57AM - 12:09PM |
B9.00007: Time Reconstruction in the CMS ECAL Detector Seth Cooper Signal time reconstruction in the CMS ECAL is of great importance to nearly all physics analyses at CMS. The reconstruction should be precise and accurate, even when the signal is out of time or the pulse height is low. This talk will cover time reconstruction in the CMS ECAL detector and examine its performance on data including test beams, cosmic rays, and LHC beam events from 2008. [Preview Abstract] |
Saturday, May 2, 2009 12:09PM - 12:21PM |
B9.00008: Tracking Performance of the ATLAS Inner Detector Tompkins Lauren, Beate Heinemann The ATLAS experiment is one of the large scale experiments designed to explore high energy collisions at the Large Hadron Collider, a proton-proton accelerator with a center of mass energy of 14 TeV. Tracking of the individual particle trajectories in the ATLAS experiment is provided by the Inner Detector. It consists of three layers of silicon pixel detectors, four layers of silicon strip detectors, and a transition radiation tracker comprised of straw proportional tubes, which provides both tracking and transition radiation detection. In preparation for collision data the ATLAS experiment has taken large amounts of cosmic ray data that have been used to calibrate and align the tracking detectors. In this presentation we will show the observed tracking performance of the Inner Detector in cosmic ray data and compare it to the expected performance for collisions using simulated data. We will examine resolutions, efficiencies and mis-identification rates to paint a picture of the tracking performance in both early data and at the detector's design luminosity. [Preview Abstract] |
Saturday, May 2, 2009 12:21PM - 12:33PM |
B9.00009: Commissioning of CMS Endcap Muon System Elizabeth Brownell This talk is as an overview of the evolution and current state of commissioning work on the CMS endcap muon system. I intend to highlight the progress in operating the detector, some problems encountered and solutions developed, lessons learned in the process, points which still require action to be taken, and data taking results. [Preview Abstract] |
Saturday, May 2, 2009 12:33PM - 12:45PM |
B9.00010: Calibration and Rate Measurements of a Digital Hadron Calorimeter Burak Bilki, Edwin Norbeck, Yasar Onel, Jose Repond, Lei Xia The calibration procedure of a finely granulated Digital Hadron Calorimeter (DHCAL) with Resistive Plate Chambers (RPCs) as active element is performed with a stack of nine layers exposed to the Fermilab test beam. The broad-band muon beam is used for calibration. Measurement of rate capability of RPCs is performed with proton beams of variable intensity. Performance parameters of the RPCs such as the efficiency and the pad multiplicity are investigated as a function of beam and detector specifications. [Preview Abstract] |
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