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Dissipative Cryogenic Filters with Zero DC Resistance

Description: The authors designed, implemented and tested cryogenic RF filters with zero DC resistance, based on wires with a superconducting core inside a resistive sheath. The superconducting core allows low frequency currents to pass with negligible dissipation. Signals above the cutoff frequency are dissipated in the resistive part due to their small skin depth. The filters consist of twisted wire pairs shielded with copper tape. Above approximately 1 GHz, the attenuation is exponential in {radical}{ome… more
Date: April 22, 2008
Creator: Bluhm, Hendrik; Moler, Kathryn A. & /Stanford U., Appl. Phys. Dept
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Partner: UNT Libraries Government Documents Department
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Study of F- Production in BaBar RPCs

Description: The BaBar detector has operated over 200 2nd generation Resistive Plate Chambers (RPCs) in the forward endcap since 2002. Many chambers have increased noise rates and high voltage currents. These aging symptoms are correlated with the integrated RPC current as expected, but also depend on the rate and direction of the gas flow, indicating that pollutants produced in the gas can accelerate aging of downstream RPC surfaces. HF produced by decomposition of the Freon 134a component of the BaBar RPC… more
Date: February 22, 2008
Creator: Band, H.R.; /Wisconsin U., Madison; Bellini, F.; /Rome U. /INFN, Rome; Covarelli, R.; /Perugia U. /INFN, Perugia et al.
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Partner: UNT Libraries Government Documents Department
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Internal Alignment of the SLD Vertex Detector

Description: The tracking resolution and vertex finding capabilities of the SLD experiment depended upon a precise knowledge of the location and orientation of the elements of the SLD pixel vertex detector (VXD3) in 3D space. At the heart of the procedure described here to align the 96 CCDs is the matrix inversion technique of singular value decomposition (SVD). This tool was employed to unfold the detector geometry corrections from the track data in the VXD3. The algorithm was adapted to perform an optimal… more
Date: December 3, 2007
Creator: Jackson, D. J.; Wickens, F. J. & Su, D.
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Partner: UNT Libraries Government Documents Department
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Status And Prospects of the BaBar SVT

Description: The BABAR Silicon Vertex Tracker (SVT) has been efficiently operated for five years since the start of data taking in 1999. It has met design requirements and no degradation in its performance has been observed thus far. However, because of higher than expected background levels, and anticipated further increases in luminosity and dose rates, we have done a thorough study to assess the viability of operating the SVT until the end of the decade.
Date: May 16, 2006
Creator: Re, V.; Bruinsma, M.; Curry, S.; Kirkby, D.; Berryhill, J.; Burke, S. et al.
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Partner: UNT Libraries Government Documents Department
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A High-resolution TOF Detector - A Possible Way to Compete with a RICH Detector

Description: Using two identical 64-pixel Burle/Photonis MCP-PMTs to provide start and stop signals, they have achieved a timing resolution of {sigma}{sub Single{_}detector} {approx} 7.2 ps for N{sub pe} {approx} 50 photoelectrons (N{sub pe}) with a laser diode providing a 1 mm spot on the MCP window. The limiting resolution achieved was {sigma}{sub Single{_}detector} {approx} 5.0 ps for N{sub pe} {approx} 180, for which they estimate the MCP-PMT contribution of {sigma}{sub MCP-PMT} {approx} 4.5 ps. The ele… more
Date: July 25, 2008
Creator: Va'vra, J; Ertley, C.; Leith, D. W. G. S.; Ratcliff, B. & Schwiening, J.
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Partner: UNT Libraries Government Documents Department
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Studies of Helium Based Gas Mixtures Using a Small Cell Drift Chamber

Description: An international collaboration is currently working on the construction and design of an asymmetric B Factory at the Stanford Linear Accelerator Center that will be ready to collect data in 1999. The main physics motivation for such a facility is to test the description and mechanism of CP violation in the Standard Model of particle physics and provide insight into the question of why more matter than antimatter is observed in the universe today. In particular, this experiment will measure CP v… more
Date: July 7, 2006
Creator: Heise, Jaret & U., /British Columbia
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electronics for Satellite Experiments

Description: The tracking detector for the LAT science instrument on the GLAST mission is an example of a large-scale particle detection system built primarily by particle physicists for space flight within the context of a NASA program. The design and fabrication model in most ways reflected practice and experience from particle physics, but the quality assurance aspects were guided by NASA. Similarly, most of the electronics in the LAT as a whole were designed and built by staff at a particle physics lab.… more
Date: May 16, 2006
Creator: Johnson, Robert P. & /UC, Santa Cruz
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Partner: UNT Libraries Government Documents Department
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A 30 ps Timing Resolution for Single Photons with Multi-pixel Burle MCP-PMT

Description: We have achieved {approx}30 psec single-photoelectron and {approx}12ps for multi-photoelectron timing resolution with a new 64 pixel Burle MCP-PMT with 10 micron microchannel holes. We have also demonstrated that this detector works in a magnetic field of 15kG, and achieved a single-photoelectron timing resolution of better than 60 psec. The study is relevant for a new focusing DIRC RICH detector for particle identification at future Colliders such as the super B-factory or ILC, and for future … more
Date: July 5, 2006
Creator: Va'vra, J.; Benitez, J.; Coleman, J.; Leith, D. W. G. S.; Mazaheri, G.; Ratcliff, B. et al.
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Partner: UNT Libraries Government Documents Department
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Simulation of the Focusing DIRC Optics with Mathematica

Description: The Focusing DIRC is considered for the Barrel PID at a possible Super-B factory. To reduce sensitivity to background, it would be desirable to reduce a size of the present BaBar photon detector. One way to do it is to replace it with a focusing optics and use smaller photon detector pixels. We have simulated the focusing optics with simulation software based on a 3D calculation performed with the Mathematica program. The software does not use Optica package, instead, it uses its own 3D algorit… more
Date: February 15, 2010
Creator: Va'vra, J.
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Partner: UNT Libraries Government Documents Department
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SLAC Cosmic Ray Telescope Facility

Description: SLAC does not have a test beam for the HEP detector development at present. We have therefore created a cosmic ray telescope (CRT) facility, which is presently being used to test the FDIRC prototype. We have used it in the past to debug this prototype with the original SLAC electronics before going to the ESA test beam. Presently, it is used to test a new waveform digitizing electronics developed by the University of Hawaii, and we are also planning to incorporate the new Orsay TDC/ADC electron… more
Date: February 15, 2010
Creator: Va'vra, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Implementation And Performance of the ATLAS Second Level Jet Trigger

Description: ATLAS is one of the four major LHC experiments, designed to cover a wide range of physics topics. In order to cope with a rate of 40MHz and 25 interactions per bunch crossing, the ATLAS trigger system is divided in three different levels. The jet selection starts at first level with dedicated processors that search for high E{sub T} hadronic energy depositions. At the LVL2, the jet signatures are verified with the execution of a dedicated, fast jet reconstruction algorithm, followed by a calibr… more
Date: November 9, 2011
Creator: Conde Muino, Patricia; Aracena, I.; Brelier, B.; Cranmer, K.; Delsart, P. A.; Dufour, M. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fast Shower Simulation in the ATLAS Calorimeter

Description: The time to simulate pp collisions in the ATLAS detector is largely dominated by the showering of electromagnetic particles in the heavy parts of the detector, especially the electromagnetic barrel and endcap calorimeters. Two procedures have been developed to accelerate the processing time of electromagnetic particles in these regions: (1) a fast shower parameterisation and (2) a frozen shower library. Both work by generating the response of the calorimeter to electrons and positrons with Gean… more
Date: November 8, 2011
Creator: Barberio, E.; Boudreau, J.; Butler, B.; Cheung, S. L.; Dell'Acqua, A.; Di Simone, A. et al.
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Partner: UNT Libraries Government Documents Department
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Experience report with the Alignment Diagnostic System

Description: Since 2009 an Alignment Diagnostic System (ADS) has been operating at the undulator of the new Linac Coherent Light Source at SLAC National Accelerator Laboratory. The undulator spans a distance of 132 meters and is structured into 33 segments. Each segment is equipped with four hydrostatic leveling sensors and four wire position monitors. This report describes the set up and reflects the experience gained with the ADS.
Date: March 3, 2011
Creator: Gassner, Georg
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Partner: UNT Libraries Government Documents Department
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Second Generation Monolithic Full-depletion Radiation Sensor with Integrated CMOS Circuitry

Description: A second-generation monolithic silicon radiation sensor has been built and characterized. This pixel detector has CMOS circuitry fabricated directly in the high-resistivity floatzone substrate. The bulk is fully depleted from bias applied to the backside diode. Within the array, PMOS pixel circuitry forms the first stage amplifiers. Full CMOS circuitry implementing further amplification as well as column and row logic is located in the periphery of the pixel array. This allows a sparse-field re… more
Date: May 20, 2011
Creator: Segal, J. D.; Kenney, C. J.; Parker, S. I.; Aw, C. H.; Snoeys, W. J.; Wooley, B. et al.
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Partner: UNT Libraries Government Documents Department
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Beam Test of a Time-of-Flight Detector Prototype

Description: We report on results of a Time-of-Flight, TOF, counter prototype in beam tests at SLAC and Fermilab. Using two identical 64-pixel Photonis Microchannel Plate Photomultipliers, MCP-PMTs, to provide start and stop signals, each having a 1 cm-long quartz Cherenkov radiator, we have achieved a timing resolution of {sigma}{sub Single{_}detector} {approx} 14 ps.
Date: April 1, 2009
Creator: Va'vra, J.; Leith, D. W. G. S.; Ratcliff, B.; Ramberg, E.; Albrow, M.; Ronzhin, A. et al.
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Partner: UNT Libraries Government Documents Department
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ILC Marx Modulator Development Program Status

Description: Development of a first generation prototype (P1) Marx-topology klystron modulator for the International Linear Collider is nearing completion at the Stanford Linear Accelerator Center. It is envisioned as a smaller, lower cost, and higher reliability alternative to the present, bouncer-topology, 'Baseline Conceptual Design'. The Marx presents several advantages over conventional klystron modulator designs. It is physically smaller; there is no pulse transformer (quite massive at ILC parameters)… more
Date: March 4, 2009
Creator: Burkhart, C.; Beukers, T.; Larsen, R.; Macken, K.; Nguyen, M.; Olsen, J. et al.
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Partner: UNT Libraries Government Documents Department
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DPSS Laser Beam Quality Optimization Through Pump Current Tuning

Description: The goal of this study is to demonstrate how a DPSS laser beam's quality parameters can be simultaneously optimized through pump current tuning. Two DPSS lasers of the same make and model were used where the laser diode pump current was first varied to ascertain the lowest RMS noise region. The lowest noise was found to be 0.13% in this region and the best M{sup 2} value of 1.0 and highest laser output power were simultaneously attained at the same current point. The laser manufacturer reported… more
Date: March 30, 2012
Creator: Omohundro, Rob; /Newport Spectra-Physics, Santa Clara; Callen, Alice; /SLAC; Sukuta, Sydney & Coll., /San Jose City
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Partner: UNT Libraries Government Documents Department
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Fast Simulation of Electromagnetic Showers in the ATLAS Calorimeter: Frozen Showers

Description: One of the most time consuming process simulating pp interactions in the ATLAS detector at LHC is the simulation of electromagnetic showers in the calorimeter. In order to speed up the event simulation several parametrisation methods are available in ATLAS. In this paper we present a short description of a frozen shower technique, together with some recent benchmarks and comparison with full simulation. An expected high rate of proton-proton collisions in ATLAS detector at LHC requires large sa… more
Date: November 29, 2011
Creator: Barberio, E.; Boudreau, J.; Butler, B.; Cheung, S. L.; Dell'Acqua, A.; Di Simone, A. et al.
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Partner: UNT Libraries Government Documents Department
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Performance of the Anti-Coincidence Detector on the GLAST Large Area Telescope

Description: The Anti-Coincidence Detector (ACD), the outermost detector layer in the Gamma-ray Large Area Space Telescope (GLAST) Large Area Telescope (LAT), is designed to detect and veto incident cosmic ray charged particles, which outnumber cosmic gamma rays by 3-4 orders of magnitude. The challenge in ACD design is that it must have high (0.9997) detection efficiency for singly-charged relativistic particles, but must also have a low probability for self-veto of high-energy gammas by backsplash radiati… more
Date: October 22, 2007
Creator: Thompson, D. J.; Charles, E.; Hartman, R. C.; Moiseev, A. A. & Ormes, J. F.
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Partner: UNT Libraries Government Documents Department
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Environmental Test Activity on the Flight Modules of the GLAST LAT Tracker

Description: The GLAST Large Area Telescope (LAT) is a gamma-ray telescope consisting of a silicon micro-strip detector tracker followed by a segmented CsI calorimeter and covered by a segmented scintillator anticoincidence system that will search for {gamma}-rays in the 20 MeV-300 GeV energy range. The results of the environmental tests performed on the flight modules (towers) of the Tracker are presented. The aim of the environmental tests is to verify the performance of the silicon detectors in the expec… more
Date: February 15, 2007
Creator: Brigida, M.; Caliandro, A.; Favuzzi, C.; Fusco, P.; Gargano, F.; Giglietto, N. et al.
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Partner: UNT Libraries Government Documents Department
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The GLAST LAT Instrument Science Operations Center

Description: The Gamma-ray Large Area Space Telescope (GLAST) is scheduled for launch in late 2007. Operations support and science data processing for the Large Area Telescope (LAT) instrument on GLAST will be provided by the LAT Instrument Science Operations Center (ISOC) at the Stanford Linear Accelerator Center (SLAC). The ISOC supports GLAST mission operations in conjunction with other GLAST mission ground system elements and supports the research activities of the LAT scientific collaboration. The ISOC… more
Date: October 16, 2007
Creator: Cameron, Robert A.
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Partner: UNT Libraries Government Documents Department
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