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 R11: Detectors I |
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Sponsoring Units: DPF Chair: Dan Amidei, University of Michigan Room: Hyatt Regency St. Louis Riverfront (formerly Adam's Mark Hotel), St. Louis B |
Monday, April 14, 2008 10:45AM - 10:57AM |
R11.00001: The CMS High-Level Trigger and Trigger Menus Aram Avetisyan The CMS experiment is one of the two general-purpose experiments due to start operation soon at the Large Hadron Collider (LHC). The LHC will collide protons at a centre of mass energy of 14 TeV, with a bunch-crossing rate of 40 MHz. The online event selection for the CMS experiment is carried out in two distinct stages. At Level-1 the trigger electronics reduces the 40 MHz collision rate to provide up to 100 kHz of interesting events, based on objects found using its calorimeter and muon subsystems. The High Level Trigger (HLT) that runs in the Filter Farm of the CMS experiment is a set of sophisticated software tools that run in a real-time environment to make a further selection and archive few hundred Hz of interesting events. The coherent tuning of the HLT algorithms to accommodate multiple physics channels is a key issue for CMS, one that literally defines the reach of the experiment's physics program. In this presentation we will discuss the strategies and trigger configuration developed for startup physics program of the CMS experiment, up to a luminosity of 10$^{31}$ s$^{-1}$cm$^{-2}$. Emphasis will be given to the full trigger menus, including physics and calibration triggers. [Preview Abstract] |
Monday, April 14, 2008 10:57AM - 11:09AM |
R11.00002: Glass Beads in Liquid Scintillator Lee Patrick Glass beads are added to liquid scintillator in several configurations and containers. Light output from each configuration is measured as cosmic ray muons pass through the beads and scintillator. This talk will outline an effort to both understand and find a configuration that can serve as a transparent, cost-effective, high density target in future high energy experiments (eg a quasi-homogenous active target in neutrino experiments). [Preview Abstract] |
Monday, April 14, 2008 11:09AM - 11:21AM |
R11.00003: Development of Digital Hadron Calorimeter Using Gas Electron Multiplier Technology Jacob Smith, H. Brown, C. Han, K.P. Hong, S.N. Kim, W.J. Kim, J. Li, C. Medina, S. Park, Andrew White, Jaehoon Yu A sampling digital hadron calorimeter (DHCAL) in combination with the Particle Flow Algorithms could provide the precise jet energy resolution demanded by the physics goals of the International Linear Collider. UTA's High Energy Physics group has been developing a DHCAL using Gas Electron Multiplier (GEM) technology. The prototype GEM detector consists of two layers of GEM foils, the thin copper-clad high voltage resistant polymer foil perforated by a high density of holes. With a high voltage applied and immersed in an easily ionizing gas, this system amplifies charge deposits from traversing charged particles in a hadronic shower. Since the readout pad can be made as small as the pitch (140 microns), GEM can resolve individual particles in the shower down to the tens of microns. Results from beam tests of GEM-based prototypes at Fermilab's Meson Test Beam Facility and cosmic ray tests will be presented. A description of possible electronic readout systems and data acquisition options for GEM based ILC will also be presented. [Preview Abstract] |
Monday, April 14, 2008 11:21AM - 11:33AM |
R11.00004: CMS ECAL Laser Monitoring System Yousi Ma The CMS Electromagnetic CALorimeter (ECAL) is a precision detector made using scintillating PbWO$_4$ crystals, capable of 0.5\% energy resolution. However, the crystals will undergo significant changes in transparency during LHC running, and thus a monitoring system is needed to track crystal response to maintain the excellent design resolution. We will discuss the design and performance of the laser monitoring system, including new results test beams with the endcap ECAL detectors. [Preview Abstract] |
Monday, April 14, 2008 11:33AM - 11:45AM |
R11.00005: Performance of the Transition Radiation Tracker in ATLAS using cosmic ray runs Taeksu Shin, Kenneth McFarlane, Vassilios Vassilakopoulos, O. Keith Baker The experimental physics program at the LHC is expected to begin this year at CERN. In preparation for this research, the detectors are being commissioned in a series of cosmic ray data runs. An overview of the ATLAS detector, the data collection and analysis, and studies in preparation for first physics will be given. In this talk, emphasis will be given to the performance of the Transition Radiation Tracker in the Inner Detector. [Preview Abstract] |
Monday, April 14, 2008 11:45AM - 11:57AM |
R11.00006: The Transition Radiation Detector of AMS 02 Feng Zhou The Alpha Magnetic Spectrometer AMS02 is equipped with a large transition radiation detector (TRD) ready for particle identification. The positron/proton separation is essential for searching for the indirect Dark Matter signals in cosmic rays. Discrimination at 10$^{2}$ to 10$^{3}$ level between positron and proton with energy up to 300 GeV has been achieved. Readiness and maintenance free operation for more than three years in space, testing and current cosmic ray measurements will be discussed. [Preview Abstract] |
Monday, April 14, 2008 11:57AM - 12:09PM |
R11.00007: Quantum 1/f Noise in Precision Measurements Peter H. Handel An investigation of electronic 1/f noise in ultrasmall devices and systems is presented, focused on nanoscale engineering of electronic devices for low phase noise. The investigation is based on the quantum 1/f formulas and raises new questions of electronic noise, since fluctuations are more important in smaller devices. Based on the quantum 1/f noise theory, we find that in a certain transition range of sizes this general law is suspended, but reappears for 1/f noise in the nanometer domain, where the transition from coherent to conventional quantum 1/f effect is complete. The coherent and conventional quantum 1/f effects and their connection are briefly derived. The resulting quantum 1/f formulas are used to derive the 1/f noise of GaN/AlGaN MODFETs, RTDs, BAW and SAW quartz resonators, MEMS resonators, and spin valves. They are also used to calculate phase noise in these devices and in oscillators based on them, from first principles along with some classical noise sources. Device optimization is thus facilitated for ultra-small devices. [Preview Abstract] |
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