Bulletin of the American Physical Society
Joint Fall 2011 Meeting of the Texas Sections of the APS, AAPT, and Zone 13 of the SPS
Volume 56, Number 7
Thursday–Saturday, October 6–8, 2011; Commerce, Texas
Session N8: High Energy Physics V |
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Chair: Fred Olness, Southern Methodist University Room: Sam Rayburn Center Second Floor, Pride Room |
Saturday, October 8, 2011 12:05PM - 12:17PM |
N8.00001: Monitoring the Performance of a CMS Tier3 Cluster for LHC Data Analysis Jacob Hill, Joel Walker, David Toback, Guy Almes, Steve Johnson, Michael Kowalczyk, Vaikunth Thukral, Daniel Cruz Every Tier 3 site is a unique entity composed of a vast array of extremely complicated interdependent hardware and software, extensively cross-networked for participation in the global endeavor of processing LHC data. Successful operation of a Tier 3 site, including performance optimization and tuning, requires intimately detailed, near real-time feedback on how the individual system components are behaving at a given moment, and how this compares to design goals and historical norms. Our monitoring project represents the creation of an array of custom server daemons which harvest data from the excellent existing analysis tools at various locations across the web, collecting the results into a site specific unified display designed extreme visual efficiency and information density.~ A functioning ``Beta'' deployment of the monitor for the Texas A{\&}M Brazos Cluster is available online: http://collider.physics.tamu.edu/tier3/mon/. [Preview Abstract] |
Saturday, October 8, 2011 12:17PM - 12:29PM |
N8.00002: The cryogenic performance of opto-electronic components for a liquid argon time projection chamber in neutron physics Lin Zhu, Andy Liu, Jingbo Ye A Liquid Argon Time Projection Chamber (LArTPC) has been proposed as a potential far site detector for the long baseline neutrino experiment (LBNE). A cold front-end electronics scheme operates in liquid argon (89 K) is under development. In this talk, I will present functional and reliability studies of opto-electronic components in liquid nitrogen (LN2, 77 K). Components of an optical data link, including a serializer ASIC, laser diodes, optical fibers, and optical connectors, have been tested to function in LN2. One type of Field Programmable Gate Arrays (FPGAs) chip is found to function at 77 K. For an optical link with its transmitting side in LAr without access for maintenance for 15+ years, the challenge lies in the system reliability. To meet this challenge, we need to understand the reliability at component level and based on that knowledge design a system with redundancy so that we do not lose data over the lifetime of the system Preliminary reliability test results on component level, including those from the FPGA chip, will be presented. A methodology is proposed to check the hot carrier issue, the most concerned failure mode in electronics operating in deep cryogenic temperatures. [Preview Abstract] |
Saturday, October 8, 2011 12:29PM - 12:41PM |
N8.00003: Structured Cable for High-Current Coils of Tokamaks Christopher Benson, Peter McIntyre, Akhdiyor Sattarov, Thomas Mann The 45 kA superconducting cable for the ITER central solenoid coil has yielded questionable results in two recent tests. In both cases the cable T$_{c}$ increased after cycling only a fraction of the design life, indicating degradation due to fatigue and fracture among the superconducting strands. The Accelerator Research Lab at Texas A{\&}M University is developing a design for a Nb$_{3}$Sn structured cable suitable for such tokamak coils. The superconductor is configured in 6 sub-cables, and each subcable is supported within a channel of a central support structure within a high-strength armor sheath. The structured cable addresses two issues that are thought to compromise opposition at high current. The strands are supported without cross-overs (which produce stress concentration); and armor sheath and core structure bypass stress through the coil and among subcables so that the stress within each subcable is only what is produced directly upon it. Details of the design and plans for development will be presented. [Preview Abstract] |
Saturday, October 8, 2011 12:41PM - 12:53PM |
N8.00004: Gas Electron Multiplier Detector Characterization with KPiX Readout System Using Particle Beams Safat Khaled Gas Electron Multiplier (GEM) detectors are a type of gaseous ionization detector created in 1997 by the Gas Detector Development Group in CERN. The High Energy Physics Group at the University of Texas at Arlington has been developing and testing double-layer GEM detectors for the digital hadron calorimeters for experiments at future accelerators, such as the International Linear Collider. The group performed a beam test experiment using four 30cmx30cm GEM prototype detectors of which one was read out using the 13bit KPiX chip cyrrently developed by the Stanford Linear Accelerator Center team. In this talk, we present the results of beam test data analysis to understand characteristics and performance of the prototype GEM. More specifically, we present the measured response, efficiency and gain of the prototype detectors. [Preview Abstract] |
Saturday, October 8, 2011 12:53PM - 1:05PM |
N8.00005: Reconstructing Drell-Yan Data at SeaQuest Tyler Hague SeaQuest is a fixed target experiment at Fermi National Accelerator Laboratory. Using the 120-GeV main injector, SeaQuest will study the nucleon sea through proton-proton and proton-deuterium Drell- Yan reactions. The Drell-Yan process occurs when a quark and an antiquark annihilate into a virtual photon that then decays into a lepton pair. From these Drell-Yan cross sections, the ratio of the d-bar to the u-bar quark distributions can be extracted. From measurements on several nuclear targets, the energy loss of fast quarks in the nucleus can be deduced. The MySQL database for SeaQuest and a new approach utilizing database commands for track reconstruction will be described. Reconstruction occurs within the database using dynamically created queries to create temporary tables. These are used to construct partial tracks at each station that can be combined into full tracks. Typically the wire chambers at each station will be used for tracking and the hodoscopes will be used for the trigger. In addition, track reconstruction with only hodoscopes is being developed for monitoring hodoscope efficiencies. [Preview Abstract] |
Saturday, October 8, 2011 1:05PM - 1:17PM |
N8.00006: Superconducting Accelerating Structure for High-Current Cyclotrons for Accelerator-Driven Subcritical Fission Nathaniel Pogue, Peter McIntyre, Akhdiyor Sattarov An accelerator driven molten salt fission core is being designed to provide reliable power by subcritical nuclear fission for the next few millennia. Fission is driven by proton beams from a flux-coupled stack of three high-current cyclotrons. A key innovation in attaining the needed beam current and efficiency is a superconducting Niobium rf accelerating cavity that can accelerate bunches in the 200 orbits uniformly. The unique design allows for several cavities to be stacked, and also provides uniform acceleration and eliminates higher order modes in the cyclotron. The design and properties of the superconducting cavity will increase the efficiency of the cyclotron and the overall energy amplification from the molten salt core by an order of magnitude compared to conventional designs. [Preview Abstract] |
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