Bulletin of the American Physical Society
2007 Joint Fall Meeting of the Texas Sections of the APS and AAPT; Zone 13 of SPS
Volume 52, Number 16
Thursday–Saturday, October 18–20, 2007; College Station, Texas
Session G1: HEN3: High Energy/Nuclear |
Hide Abstracts |
Chair: James White, Texas A&M University Room: Rudder Tower 701 |
Friday, October 19, 2007 3:45PM - 3:57PM |
G1.00001: Testing of Edgeless Planar Detectors for the LHC William Spearman, Gennaro Ruggiero One goal of the TOTEM project at CERN's LHC is to measure protons scattered at very high pseudorapidities. Conventional detectors have very large dead zones making them a non-option for an experiment which requires detection capabilities at about 1 mm from the beam. To overcome the limitations of conventional detectors, edgeless planar detectors were developed which will be placed in special fixtures in the beam pipe known as Roman Pots. To make these detectors edgeless, current terminating structures were used which channel the current generated by electrostatic impurities and the current resulting from the biasing voltage away from the sensitive area. The design and testing of the current terminating capability of these structures, with special regard concerning the effects of radiation on the performance of these silicon detectors, will be discussed. [Preview Abstract] |
Friday, October 19, 2007 3:57PM - 4:09PM |
G1.00002: CMS Endcap Hadron Calorimeter (HE) Response to High Energy Electron and Pions Youn Roh, Nural Akchurin, Sung-won Lee The response of the CMS endcap hadron calorimeter to high energy beam will be presented. The data were taken at the H2 beam line at CERN in the summer of 2007 with 10-300 GeV/c pions and electrons. We report on the overall performance of the endcap calorimeters with emphasis on response linearity and energy resolution. [Preview Abstract] |
Friday, October 19, 2007 4:09PM - 4:21PM |
G1.00003: Gas Electron Multiplier Prototype Test Beam Studies for International Linear Collider Jacob Smith, H. Brown, C. Medina, J. Li, K.P. Hong, S.N. Kim, C. Han, S. Park, A. White, J. Yu A sampling digital hadron calorimeter (DHCAL) in combination with the Particle Flow Algorithms could provide the high 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. GEM consists of multiple layers of copper-clad thin plastic foil each containing micron sized holes. With a high voltage applied across each layer this system amplifies the signal from energy deposits of traversing charged particles from a hadronic shower. In addition, due to the small pitch between the holes, GEM can resolve individual particles in the shower down to the micrometer level. This talk will focus on the development and performance of UTA's double GEM detectors. Results from beam tests at Fermilab's Meson Test Beam Facility will also be presented. [Preview Abstract] |
Friday, October 19, 2007 4:21PM - 4:33PM |
G1.00004: Development of a CMS Tier-3 center and HEP computing for LHC physics Chiyoung Jeong, Micah Gatz, Alan Sill, Sung-won Lee, Nural Akchurin This presentation will highlight HEP computing efforts made to prepare Texas Tech University to operate a Tier-3 site for the upcoming LHC experiments at CERN. Transferring large amounts of CMS data using the PhEDEX (Physics Experiment Data Export) file transfer system, development of a remote data quality monitoring station for first pass-analysis and processing the CMS data on a HEP cluster at TTU will be discussed. [Preview Abstract] |
Friday, October 19, 2007 4:33PM - 4:45PM |
G1.00005: Missing Transverse Energy in events with tau particles at the CMS detector Alfredo Gurrola, Teruki Kamon, Chi-Nhan Nguyen, Alexei Safonov The Large Hadron Collider (LHC) is expected to probe new physics beyond the Standard Model. A characteristic feature of new physics signals at the LHC will be the presence of large missing transverse energy (MET). Furthermore, our ability to fully reconstruct the Higgs mass in the di-tau decay channel is very sensitive to the measurement of the missing energy. Thus, it becomes extremely important to measure the missing energy accurately and with good precision. We overview the current status of MET measurements at the CMS detector, and present a method for improving this measurement in events with hadronically decaying taus. [Preview Abstract] |
Friday, October 19, 2007 4:45PM - 4:57PM |
G1.00006: Database for the PHENIX RPC Factory Timothy Jones The Pioneering High Energy Nuclear Interaction Experiment (PHENIX) is located on the Relativistic Heavy Ion Collider (RHIC) ring at Brookhaven National Laboratory. One of the goals of RHIC is to discover the origin of the proton spin. Resistive Plate Chambers (RPCs) will be used at PHENIX as a level 1 trigger to select single high transverse momentum muon events from a large background of low transverse momentum muon events. During the assembly of the RPCs, we will be keeping track of information from quality control tests, performance tests and the position each RPC will occupy in the detector. This information will be used for calibrations after the RPCs are installed in PHENIX. Therefore, the information needs to be organized and stored in such a way that it can easily be accessed over the next several years. This will be done through the use of a database that will be accessed both by a program which inputs data automatically from a number of systems and by a web interface that will be used both to input information and access that information at a later date. The structure of the database will be presented as well as the methods that will be used to input the information. [Preview Abstract] |
Friday, October 19, 2007 4:57PM - 5:09PM |
G1.00007: Electron identification at STAR and the Barrel Preshower detector Matt Cervantes The Barrel Electromagnetic Calorimeter (BEMC) in the STAR experiment at RHIC is a sampling lead scintillator consisting of 4800 towers. The data from the first 2 layers of each tower is read out separately and formally defines the Barrel Preshower (BPRS) detector. The BPRS distinguishes between electrons developing a shower early in the calorimeter tower as opposed to interactions that occur beyond these first 2 layers. We will report on the commissioning of the BPRS into the STAR detector and its implementation into an electron-based analysis. We present the standard method of particle identification currently used for electron selection and investigate the effect of using the BPRS detector. Comparison of such an analysis with and without the BPRS will be shown. [Preview Abstract] |
Friday, October 19, 2007 5:09PM - 5:21PM |
G1.00008: Coil Configurations Study for Bi-2212 Subscale Magnets Christopher English The Superconducting Magnet Group at Lawrence Berkeley National Laboratory is developing subscale superconducting magnets consisting of Bi-2212 (Bi$_{2}$-St$_{2}$-Ca-Cu$_{2}$O$_{x})$ racetrack coils as part of its subscale program. Several configurations are being considered: the stand-alone racetrack, subscale common coil, subscale dipole, and subscale hybrid dipole. In order to prepare for the assembly and testing of these magnets, a study has been carried out to determine the short sample current (I$_{ss})$ and the Lorentz forces for each configuration. OPERA 3D has been used to ascertain the load lines for each subscale magnet. The intersection of these load lines with the engineering critical current density versus magnetic field curve ($J_{EC}(B))$ for Bi-2212 round wire subsequently determined the I$_{ss}$. The results show little variation in the I$_{ss}$ of each configuration due to the small slope of the $J_{CE}(B)$ in the field range of 5-10 T. The Lorentz forces, also determined with OPERA 3D, have been analyzed by defining the magnetic pressure on the coils. Results from this analysis show that a possible testing sequence for the subscale program could be the stand-alone racetrack, subscale common coil, subscale dipole, and finally the subscale hybrid dipole, in order of increasing magnetic pressure. [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