Bulletin of the American Physical Society
Joint Fall 2009 Meeting of the Texas Sections of the APS, AAPT, and SPS
Volume 54, Number 13
Thursday–Saturday, October 22–24, 2009; San Marcos, Texas
Session C3: High Energy Physics |
Hide Abstracts |
Chair: Carlos Bertulani, Texas A&M - Commerce Room: LBJ Student Center 3-10.1 |
Friday, October 23, 2009 2:00PM - 2:12PM |
C3.00001: Superconducting RF Cavity for Testing Materials and Fabrication Processes at 1.3 GHz at over 3 times the BCS Limit of Niobium Nathaniel Pogue, Peter McIntyre, Akhdiyor Sattarov A 1.3 GHz test cavity has been designed to test wafer samples of superconducting materials. The surface magnetic field on the sample wafer is 3.75 times greater than anywhere else on the cavity surface. The cavity also facilitates measurement of the rf surface resistance corresponding to a Q of 10$^{10}$. The cavity is operated in a TE(01) mode. A high purity sapphire hemisphere is used to enhance the circulating field on the sample and suppress the fields on the remainder of the cavity surface. The sapphire purity must be tested for its loss tangent and dielectric constant. To test these properties a smaller sapphire rod of the same quality will be inserted into a CEBAF cavity operating in a TE(01) mode. This will allow us to measure the temperature of the sapphire as a function of input energy and time, and the dielectric constant through its effect on the resonant frequency. [Preview Abstract] |
Friday, October 23, 2009 2:12PM - 2:24PM |
C3.00002: Development of Digital Hadron Calorimeter Using Gas Electron Multiplier (GEM) Technology Seongtae Park, Jacob Smith, Edwin Baldelomar, Clayton Wills, Mark Sosebee, Andy White, Jaehoon Yu, Kwangjune Park High Energy Physics Experiments at future International Linear Collider requires high precision jet energy measurements. For this purpose, the University of Texas at Arlington has been developing gas electron multiplier (GEM) based Digital Hadron Calorimeter (DHCAL) over the past seven years. Several prototype detector with various sizes, including multiple 30x30 cm$^{2}$ GEM detectors have been built. In this talk, the detector construction and its performance test results are presented. Detectors have been tested with Ru106, Fe55 and cosmic ray. Data taking has been done using KPiX ASICS (being developed at SLAC) for front-end readout electronics for SiD detector concept. As a future plan, 1x1 m$^{2}$ large GEM detector construction and testing are described. [Preview Abstract] |
Friday, October 23, 2009 2:24PM - 2:36PM |
C3.00003: 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] |
Friday, October 23, 2009 2:36PM - 2:48PM |
C3.00004: Results from the Commissioning of the ATLAS Pixel Detector with Cosmic data Masayuki Kondo The ATLAS Pixel Detector is the innermost detector of the ATLAS experiment at the Large Hadron Collider at CERN with approximately 80M electronic channels, designed to be high-acceptance, high-resolution, low-noise tracking performance providing the desired refinement in charged track pattern recognition capability in order to meet the stringent track reconstruction requirements of ATLAS. Being the last sub-system installed in ATLAS by the end of June 2007, Pixel Detector was successfully connected, commissioned, and tested in situ while meeting an extremely tight operations schedule, and is ready to take data upon the projected turn-on of the LHC. UTD group has successfully deployed and commissioned the environmental controls crucial for stable detector operation. Since fall 2008, Pixel Detector was included in the combined ATLAS detector operation, collecting physics data with cosmic muons. Details from the Pixel Detector calibration procedures and the results obtained with collected cosmic data, are presented along with the current detector status summary. [Preview Abstract] |
Friday, October 23, 2009 2:48PM - 3:00PM |
C3.00005: The Monte Carlo Simulation for the ATLAS Experiment Wei Cheng Wong The Monte Carlo simulation of physics events and the ATLAS detector has been a critical part of the Atlas experiment operated at the Large Hadron Collider (LHC) at CERN. Large samples of simulated physics events have been produced that are used for physics and the study of the complex detector. The cutting edge techniques and facilities, including the Grid Computing, the operation of the storage system, simulation validations, user access to the simulated events, the ATLAS Experiment Data Management System, and the user experience, will be presented. [Preview Abstract] |
Friday, October 23, 2009 3:00PM - 3:12PM |
C3.00006: TAMU3: High-field superconducting dipole development for future hadron colliders Eddie F. Holik III High-field superconducting dipole magnets suitable for future hadron colliders are being developed at Texas A{\&}M University. Technology advancements are being pursued to enable the use of advanced superconductors Nb$_{3}$Sn and Bi-2212. These techniques include stress management, flux-plate control of persistent-current multipoles, fine-filament superconducting mixed-strand cable, block-coil geometry for ease of construction and potential suppression of snap-back, and metal-filled bladders to provide uniform surface compliance and coil pre-load. The latest such magnet, TAMU3, is presently under construction. Its design and fabrication will be described. [Preview Abstract] |
Friday, October 23, 2009 3:12PM - 3:24PM |
C3.00007: Stress Management and Capacitive Stress Transducers Used in Dipole Magnets Christopher Benson, Peter McIntyre, Al McInturff, Andrew Jaisle, Trey Holik Research in accelerator dipole magnet technology is aimed first and foremost to produce as high a magnetic field as possible. However, stresses in the superconducting coil packages from Lorentz forces limit the maximum field. Future dipole magnets are being designed, built, and tested by the Accelerator Research Lab at Texas A\&M University which incorporate unique stress management techniques. Within these magnets, custom capacitive pressure transducers are being developed to monitor the Lorentz forces within the coil package. A brief introduction to stress management techniques used in future TAMU magnets will be given, along with the status of current and future research involving tooling and fabrication techniques used in the production of capacitive pressure transducers. [Preview Abstract] |
Friday, October 23, 2009 3:24PM - 3:36PM |
C3.00008: Intercalibration Analysis in the Calorimeter/ITC from the Atlas Detector Using Cosmic Ray Data Carlos Medina The Large Hadron Collider is the largest most ambitious experiment in high energy physics history. It involves the greatest number of scientists from around the world. The first collisions will start being produced in late 2009 and we expect that the information collected will help us understand the physics behind the standard model such as higgs physics and the supersymmetric theories. The high energy physics group in UTA is actively involved with the design, construction and commissioning process of the ATLAS Tile Calorimeter. This work presents an analysis on the inter-calibration of the ITC (intermediate tile calorimeter) cell response to cosmic rays detection. Based on the cosmic data recently taken in the ATLAS detector, while waiting for real collisions, we are able to compare values of energy deposition in individual cells to guarantee the homogeneous performance of the ITC. [Preview Abstract] |
Friday, October 23, 2009 3:36PM - 3:48PM |
C3.00009: Petavac: 100 TeV hadron collisions in the SSC tunnel Peter McIntyre, Akhdiyor Sattarov Nb$_{3}$Sn superconductor has been tamed into practical use to make possible high-field dipoles (16 T) and solenoids (25 T). A ring of Nb$_{3}$Sn dipoles and quadrupoles could be installed in the SSC tunnel in Waxahatchie to make a hadron collider with 100 TeV collision energy - 7 times higher than the design energy of CERN's LHC. The Petavac would access new physics through boson fusion, making it possible to observe signals from supersymmetry and superstrings up to $\sim $10 TeV mass scale. [Preview Abstract] |
Friday, October 23, 2009 3:48PM - 4:00PM |
C3.00010: Study of hadronic W decays in the Jets+MET final state Kittikul Kovitanggoon, Sung-Won Lee, Teruki Kamon, Michael Weinberger We present a systematic study of hadronic W decays in the Jets+MET final state to characterize the supersymmetry signal at the LHC. Because of the complicated end point, the experimental question leads to detection of the Standard Model W bosons (and eventually detecting top quark) in Jets+MET final state. We will discuss a data-driven method to extract W event inclusively in the hadronic decays from a minimal super gravity process, on the basis of Monte Carlo data. [Preview Abstract] |
Friday, October 23, 2009 4:00PM - 4:12PM |
C3.00011: ABSTRACT WITHDRAWN |
Friday, October 23, 2009 4:12PM - 4:24PM |
C3.00012: Test Chamber for Optimizing a High Pressure Xenon Neutrinoless Double Beta Decay Detector Paul Robert The NEXT experiment is designed to search for neutrinoless double beta decay in high pressure xenon gas; the gas is enriched with $^{136}$Xe which is a double beta decay candidate emitter. It is currently in the research and development phase and is scheduled to be operating in Canfranc Underground Laboratory in Huesca Spain within the next 5 years. High pressure xenon gas is chosen because of its excellent energy resolution and the ability to observe tracks. Observation of the track end points will provide excellent background rejection. The design and principle of a test chamber used to optimize the detector design will be discussed. [Preview Abstract] |
Friday, October 23, 2009 4:24PM - 4:36PM |
C3.00013: The Design,Construction, and Goals of the LUX Dark Matter Search Experiment Rachel Mannino The LUX (Large Underground Xenon) experiment will be the world's most sensitive search experiment for the dark matter candidate known as the WIMP (Weakly Interacting Massive Particle). It is currently under construction and will be deployed in the Davis Cavern at Homestake Mine in South Dakota later this fall. The design, construction, and physics reach will be discussed. [Preview Abstract] |
Friday, October 23, 2009 4:36PM - 4:48PM |
C3.00014: Low-Background Screening for Rare Event Experiments Using a Multi Parallel Plate Chamber Clement Sofka Rare event searches, such as double beta decay and direct dark matter (DM) detection, present a host of challenges in detector design and implementation. One of the most limiting factors is the presence of background radiation which originates from radioactive isotope impurities in the materials used to construct the detector. We present a unique method for detecting ultra-low levels of contamination by placing voltages of alternating polarity on several stacked parallel plates separated by a narrow gap in a pressurized gas. Our design exploits the geometry of the well-known single-layer parallel plate chamber (PPC), but uses multiple plates made out of the material being measured. The design, efficiency, and anticipated sensitivity will be discussed. [Preview Abstract] |
Friday, October 23, 2009 4:48PM - 5:00PM |
C3.00015: Under what conditions do accelerating charges radiate? An examination of recent literature Edward Butterworth, Paul Cox The process by which accelerated charges emit electromagnetic radiation remains surprisingly obscure: even at the advanced level, most textbooks do not treat it in detail, and published reports show a wide variety of descriptions of the process, some of which have led to paradoxes. Three situations receive particular attention in the literature: a static charge in a gravitational field, a uniformly accelerated charge and a charge in uniform circular motion. Some of the paradoxes reported may relate to terminological confusion: Shariati {\&} Khorami (1999) identify three distinct ways in which the word ``radiation'' is commonly used. Against published claims that uniformly accelerated charges do not radiate, Boulware (1980) and de Almeida {\&} Suu (2006) propose that they do, but into a region of spacetime inaccessible to a comoving observer. Piazzese (2003) obtains the result that charges in uniform circular motion do not radiate, subject to particular constraints that limit orbital size; with the result that electrons in Bohr orbits do not radiate, while synchrotron radiation is allowed. The present paper provides an overview of the body of literature on this topic, and identifies several significant themes that seem appropriate for further development. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700