Bulletin of the American Physical Society
APS April Meeting 2010
Volume 55, Number 1
Saturday–Tuesday, February 13–16, 2010; Washington, DC
Session P12: Instrumentation for Particle Physics II |
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Sponsoring Units: DPF Chair: Kevin Pitts, University of Illinois at Urbana-Champaign Room: Virginia A |
Monday, February 15, 2010 10:45AM - 10:57AM |
P12.00001: The CDF Silicon Detector: Performance and Longevity Sabastian Carron Montero The CDF Run II silicon detector is the largest operating silicon detector in High Energy Physics. Its 722,000 channels spread over 7 m$^{2}$ of silicon micro-strip sensors allow precision tracking and vertexing. The CDF silicon detector played a critical role in the discovery of Bs mixing and is used extensively for the current Higgs Boson searches. Over the last 7 years, the detector efficiency has remained stable at 95 $\%$ after the Run II commissioning period. While originally designed to withstand up to 3 fb$^{-1}$ of data, the CDF silicon detector will have to last until the end of Run II when 10 fb$^{-1}$ of data is expected to be delivered. In this talk we describe the study of 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] |
Monday, February 15, 2010 10:57AM - 11:09AM |
P12.00002: In situ performance of the Transition Radiation Tracker of the ATLAS detector M. Liu, A. Bocci, E.B. Klinkby, A. Goshaw The Transition Radiation Tracker (TRT) is the outermost of the three tracking subsystems of the ATLAS Inner Detector at the Large Hadron Collider. It is a straw-tube based gas detector providing continuous tracking as well as particle identification capability. The TRT has been successfully commissioned with data collected from millions of cosmic ray muons. In this talk, we present a study of the in situ performance of the detector, with particular emphasis on the measurement of the robustness of track reconstruction. [Preview Abstract] |
Monday, February 15, 2010 11:09AM - 11:21AM |
P12.00003: Study of the behavior of highly ionizing particles in the ATLAS Transition Radiation Tracker K. Finelli, A. Bocci, E.B. Klinkby, M. Kruse The Transition Radiation Tracker (TRT) is the outermost of the 3 tracking subsystems of the ATLAS Inner Detector at the Large Hadron Collider. It is a straw based gas detector providing continuous tracking as well particle identification capability. It also provides information about the amount of ionization produced by charged particles crossing the straws. In this talk we present a study of the detector response to heavy ionizing particles that could either be heavy or doubly charged as predicted by some new physics models. We also discuss studies using this information in the TRT to discriminate these particles from those with normal ionization. [Preview Abstract] |
Monday, February 15, 2010 11:21AM - 11:33AM |
P12.00004: Study of transition radiation in the ATLAS Transition Radiation Tracker using test beam and cosmic ray data Alex Harvey Experiments at the design luminosity of the LHC face a challenge in particle identification. Many of the interesting event signatures involve leptons. Transition radiation (TR) as a constraint on identification of ultra-relativistic electrons can be significant in rejecting background while efficiently selecting interesting events. The ATLAS Transition Radiation Tracker (TRT) is designed to produce and detect TR with this in mind. Simulations of TR will be compared with data taken during the 2004 ATLAS Combined Test Beam run and during the 2008 and 2009 cosmic-ray commissioning runs. [Preview Abstract] |
Monday, February 15, 2010 11:33AM - 11:45AM |
P12.00005: Measurement of Lorentz Angle for the CMS Pixel Detector Ashish Kumar At the core of the CMS all-silicon tracking system is the silicon pixel detector, comprising three barrel layers and two pixel disks in the forward and backward regions, accounting for a total of 66 million channels. The pixel detector will provide high-resolution 3D coordinates of the tracks produced in high energy pp collisions. Under the combined action of electric and magnetic fields, the charged carriers traversing the pixel sensors experience the Lorentz force. It causes charge sharing among neighboring pixels which is crucial in enhancing the spatial resolution. In the barrel pixels, the electric and magnetic fields are perpendicular resulting in maximum Lorentz drift, while, in the disks, the fields are oriented at 20 degrees resulting in much smaller Lorentz drift. We present the results of Lorentz angle measurement for the pixel detector using CMS data taken with cosmic runs. [Preview Abstract] |
Monday, February 15, 2010 11:45AM - 11:57AM |
P12.00006: Laser Testing for the ATLAS Forward Proton Time of Flight Detector Ian Howley, Andrew Brandt In 10 trillionths of a second light travels 3mm. Our group at UTA is currently developing the most precise time of flight (TOF) detector ever deployed in a collider experiment, with a resolution on this 10 picosecond scale. In conjunction with several other universities we have proposed to install a fast timing system as part of a proton detector upgrade to the main ATLAS detector at the Large Hadron Collider (LHC) . Precise measurement of the timing of proton tracks will allow rejection of background to the physics processes of interest, which include the elusive Higgs Boson. Laser based tests at UTA allow us to measure the response of our detectors downstream electronics including constant fraction discriminators, amplifiers and most importantly the microchannel plate photomultiplier tubes, which are at the heart of this fast-timing system. By isolating the individual components of the detector in this fashion, we can fully characterize each device's response. My research is part of the ongoing data analysis using the CERN analysis package ROOT. By closely examining the pulse height, time difference distributions, and transit time spread (TTS) we are be able to understand the performance of the detectors and electronics in laser and beam tests to better prepare ourselves for future test beams and eventually full scale installation and operation. I will present the latest performance test results from data I have analyzed. [Preview Abstract] |
Monday, February 15, 2010 11:57AM - 12:09PM |
P12.00007: Performance of a Single-Crystal Diamond-Pixel Telescope Dmitry Hits, Steve Schnetzer, Robert Stone, Ed Bartz, John Doroshenko, Valerie Halyo, Bert Harrop, Adam Hunt, Dan Marlow, Will Johns, William Bugg, Matt Hollingsworth, Stefan Spanier, Richard Hall-Wilton, Vladimir Ryjov, Manfred Pernicka We will present the results of a test beam study of a single-crystal, diamond, pixel telescope. This telescope is a prototype for a dedicated luminosity monitor for CMS. The telescope has three equally-spaced planes with a total length of 7.5 cm. Each plane consists of a single-crystal CVD diamond with an active area of 4mm $\times$ 4mm bump-bonded to a PSI46v2 pixel readout chip. The study was carried out in a high energy pion beam at the CERN SPS. We will present results on the performance of the telescope including occupancy, efficiency, pulse height distributions and tracking. [Preview Abstract] |
Monday, February 15, 2010 12:09PM - 12:21PM |
P12.00008: The CMS Luminosity Measurement and Results of its First Calibration using Van de Meer Scans Jeremy Werner, Nadia Adam, Valerie Halyo, Adam Hunt, John Jones, Daniel Marlow We present an overview of the hadronic forward calorimeter (HF) based luminosity measurement at CMS, with an emphasis on the results of the recent Van de Meer scans. We describe the HF luminosity readout along with the methods used to extract the relative luminosity measurement at CMS. Finally, we review the procedure to calibrate the luminosity measurement and present the results from the first collisions. [Preview Abstract] |
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