Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session Y8: Advances in Detector Instrumentation and Computing |
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Sponsoring Units: DPF Room: Marriott Tampa Waterside Room 4 |
Tuesday, April 19, 2005 1:30PM - 1:42PM |
Y8.00001: Dilepton Triggers for SUSY Searches at CDF Melisa Rossi There are several SUSY scenarios that favour the production of events characterized by multiple leptons in the final state. The Collider Detector at Fermilab (CDF) has developed a dedicated dilepton trigger for exotic searches which is organized in a multipath structure. We will discuss the potential of this trigger and present a new strategy for monitoring and calibration which is based on single leptons rather than lepton pairs. The application of this technique to CDF Run II data will be illustrated. [Preview Abstract] |
Tuesday, April 19, 2005 1:42PM - 1:54PM |
Y8.00002: CMS HCAL Detector Upgrade Studies for SLHC Conditions Firdevs Duru, Ugur Akgun, Ahmet Ayan Super Large Hadron Collider (SLHC) will have reduced bunch spacing, increased interactions and crossings compared to LHC. These changes will increase the integrated luminosity to 1000 fb$^{-1}$/yr. Under such high radiation conditions the scintillators used for hadron calorimeter (HCAL) of the CMS detector will not survive. As a solution to this problem we propose to use quartz plates along with waveshifting fibers. In this talk we summarize the tests performed and methods developed to increase the efficiency of the quartz plates as well as radiation damage tests done by University of Iowa CMS group. [Preview Abstract] |
Tuesday, April 19, 2005 1:54PM - 2:06PM |
Y8.00003: Radiation-hard ASICs for Optical Data Transmission in the ATLAS Pixel Detector Paul Jackson, K.K. Gan, Amir Rahimi We have developed two radiation-hard ASICs for optical data transmission in the ATLAS pixel detector at the CERN Large Hadron Collider (LHC). The first circuit is a driver chip for a Vertical Cavity Surface Emitting Laser (VCSEL) diode for 80 Mbit/s data transmission from the detector. The second circuit is a Bi-Phase Mark decoder chip to recover the control data and 40 MHz clock which is received optically by a PIN diode on the detector side. During ten years of operation at the LHC, the ATLAS optical link circuitry will be exposed to a maximum total fluence of $10^{15}$ equivalent n/cm$^2$. We have successfully implemented both ASICs in deep submicron (0.25 micron) CMOS technology using enclosed layout transistors and guard rings for increased radiation hardness. The driver and the decoder chips are four-channel devices compatible with common cathode PIN and VCSEL arrays. We present comprehensive results from the final engineering run and from irradiation studies of both circuits with 24 GeV protons up to a total dose of 62 Mrad. Furthermore we report on the current status of the production run. [Preview Abstract] |
Tuesday, April 19, 2005 2:06PM - 2:18PM |
Y8.00004: The BaBar Limited Streamer Tubes Detector Quincy Wong We have replaced the Resistive Plate Chambers in the gaps of the BaBar Instrumented Flux Return, used to detect muons and neutral hadrons, with plastic Limited Streamer Tubes (LST). After extensive detector R\&D and testing we adopted a modular and robust design that provides a high degree of reliability and redundancy combined with easy maintainability. In this presentation we will discuss the design, the construction and the performance of the BaBar LST detector. [Preview Abstract] |
Tuesday, April 19, 2005 2:18PM - 2:30PM |
Y8.00005: Phototube Testing for the MiniBooNE Experiment Laura Gladstone, Steve Brice, Len Bugel, Janet Conrad, Bonnie Fleming, Eric Hawker, Phillip Killewald, Justin May, Shawn McKenney, Paul Nienaber, Ryan Patterson, Byron Roe, Vern Sandberg, Darrel Smith, Matt Wysocki The MiniBooNE experiment at FNAL is a neutrino $\nu_\mu \rightarrow \nu_e$ oscillation search whose detector is a 12 m spherical oil tank lined with 1520 8 inch photomultiplier tubes, Hamamatsu models R1408 and R5912, with custom--designed bases. Tests were performed on all the phototubes to determine the dark rate, charge and timing resolutions of the response, double--pulsing rate, and desired operating voltage for each tube, so that they could be sorted for optimal use in the detector. Eight additional phototubes were tested to find the angular dependance of their response, and these results for the R1408 and R5912 phototubes were fit to 5-- and 6--degree polynomials, respectively. This test was performed again at various voltages. These fits were incorporated into the MiniBooNE Monte Carlo. After the Super--K phototube implosion accident, an analysis was performed to determine the risk of a similar accident with MiniBooNE, and the risk was found to be negligible. *MiniBooNE is an experiment at Fermi National Accelerator Laboratory [Preview Abstract] |
Tuesday, April 19, 2005 2:30PM - 2:42PM |
Y8.00006: Grid-Enabled High Energy Physics Research using a Beowulf Cluster Akhtar Mahmood At Edinboro University of Pennsylvania, we have built a 8-node 25 Gflops Beowulf Cluster with 2.5 TB of disk storage space to carry out grid-enabled, data-intensive high energy physics research for the ATLAS experiment via Grid3. We will describe how we built and configured our Cluster, which we have named the Sphinx Beowulf Cluster. We will describe the results of our cluster benchmark studies and the run-time plots of several parallel application codes. Once fully functional, the Cluster will be part of Grid3[\textit{www.ivdgl.org/grid3}]. The current ATLAS simulation grid application, models the entire physical processes from the proton anti-proton collisions and detector's response to the collision debri through the complete reconstruction of the event from analyses of these responses. The end result is a detailed set of data that simulates the real physical collision event inside a particle detector. Grid is the new IT infrastructure for the 21$^{st}$ century science -- a new computing paradigm that is poised to transform the practice of large-scale data-intensive research in science and engineering. The Grid will allow scientist worldwide to view and analyze huge amounts of data flowing from the large-scale experiments in High Energy Physics. The Grid is expected to bring together geographically and organizationally dispersed computational resources, such as CPUs, storage systems, communication systems, and data sources. [Preview Abstract] |
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