Bulletin of the American Physical Society
APS April Meeting 2011
Volume 56, Number 4
Saturday–Tuesday, April 30–May 3 2011; Anaheim, California
Session J7: Instrumentation I |
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Sponsoring Units: DNP Chair: Andreas Piechaczek, Oak Ridge Associated Universities Room: Grand E |
Sunday, May 1, 2011 1:30PM - 1:42PM |
J7.00001: A testing system for CUORE preamplifier production Xiaohua Liu A testing system has been developed for the quality control of the production of the preamplifier for CUORE experiment. There are a total of 988 channels for the readout of CUORE TeO2 crystal bolometers. The preamplifier has a JFET pair at input stage, a gain of 202V/V, very low noise, adjustable common mode rejection ratio, a circuit for the compensation of the detector bias and the offset of JFET pair. The testing system can verify the functions and measure the characteristics to ensure the preamplifiers meet the specifications. The testing system consists of a test carrier board, a bandpass filter board, low noise power supplies, digital control adapters, a data acquisition(DAQ) system and test software based on MATLAB. A test procedure has been developed to configure the devices and test circuits, to control DAQ board to generate the stimulus signal and to acquire the response signal, to analyze the acquired data and store the test result. A web database has also been developed to store the test result. We will present the CUORE electronics testing system and discuss test result from the preamplifier production. [Preview Abstract] |
Sunday, May 1, 2011 1:42PM - 1:54PM |
J7.00002: LGB Crystals in Plastic for Anti-Neutrino Detection and $^{3}$He Replacement Kareem Kazkaz, Nathaniel Bowden, Peter Nelson, Marisa Pedretti Scintillating lithium gadolinium borate (LGB) crystals have a high neutron capture cross-section and a long scintillation decay constant. By mixing small shards into a clear plastic matrix, neutrons can be moderated to allow for easier capture within the high capture cross-section crystal. If the plastic is scintillating, the combination can be used to measure an anti-neutrino flux. A non-scintillating plastic makes for a possible solid-state replacement for He-3 tubes. We present experimental data from both kinds of detector, with a focus on neutron efficiency and gamma identification or rejection. We explore Monte Carlo models to determine the optimal LGB content, and present preliminary results from using pulse shape analysis to reduce systematic effects. [Preview Abstract] |
Sunday, May 1, 2011 1:54PM - 2:06PM |
J7.00003: Demonstration of a Lightguide Detector for Liquid Argon TPCs Leonard Bugel, J. Conrad, C. Ignarra, B. Jones, T. Katori, T. Smidt, H. Tanaka We report demonstration of light detection in liquid argon using an acrylic lightguide detection system. This opens the opportunity for development of an inexpensive large area light collection system for large liquid argon time projection chambers. The guides are constructed of acrylic, with TPB embedded in a surface coating with a matching index of refraction. We study the response to early scintillation light produced by a 5.3 MeV alpha. We measure responses from 7 to 8 PE on average, compared to an ideal expectation of 10 PE on average. We estimate the attenuation length of light along the lightguide bar to be greater than 0.5 m. The coating response and attenuation length can be improved; we show however, that these results are already sufficient for triggering in a large detector. [Preview Abstract] |
Sunday, May 1, 2011 2:06PM - 2:18PM |
J7.00004: Compton Imaging results of the AGATA A006 detector Mike Slee, Andrew Boston, Helen Boston, Daniel Judson, Steven Moon By comparing the pulse shapes, using pulse shape analysis (PSA), the interaction positions within a position sensitive HPGe crystal can be accurately located. Compton Image Reconstruction can be used to create an image testing the accuracy of the ability to locate the positions of scatter and absorption events, through PSA. The more accurately the points of interaction are known the better the image will be, thus the PSA algorithms are. An interesting use for this is for imaging applications, most commercial Compton Imagers use scintillators but the energy resolution from these systems is poor. One suggested method would be to utilize two planer Ge strip detectors but despite the high energy resolution the efficiency is poor due the detector being operated in coincidence. To achieve increased efficiency and high resolution, a large volume HPGe position sensitive crystal, such as the AGATA A006 detector, can be utilized to detect full energy events that Compton scatter within the detector. Results of Compton Imaging from the AGATA A006 detector will be discussed. [Preview Abstract] |
Sunday, May 1, 2011 2:18PM - 2:30PM |
J7.00005: The GlueX Barrel Electromagnetic Calorimeter Zisis Papandreou, George Lolos, Andrei Semenov The goal of the {\sc GlueX} experiment at Jefferson Lab is to search for exotic hybrid mesons as evidence of gluonic excitations, in an effort to understand confinement in QCD. A key subsystem of the {\sc GlueX} detector is the electromagnetic barrel calorimeter ({\sc BCAL}) located inside a 2-Tesla superconducting solenoid. {\sc BCAL} is a ``spaghetti calorimeter,'' consisting of layers of corrugated lead sheets, interleaved with planes of 1-mm-diameter, double-clad, Kuraray SCSF-78MJ scintillating fibres, bonded in the lead grooves using optical epoxy. The detector will consist of 48 modules and will be readout using nearly 4,000 large-area (1.26~cm$^2$ each) silicon photomultiplier arrays. {\sc BCAL} construction is well under way at the University of Regina and test results will be shown. [Preview Abstract] |
Sunday, May 1, 2011 2:30PM - 2:42PM |
J7.00006: ABSTRACT WITHDRAWN |
Sunday, May 1, 2011 2:42PM - 2:54PM |
J7.00007: The Monte-Carlo Environment for the STAR High Level Trigger Hongwei Ke, Hao Qiu, Xiangming Sun The STAR High Level Trigger (HLT) is implemented in order to select events of interest in real time by tracking events online. In year 2010, the HLT has successfully selected the events with high pT charged particles, di-electron and light nuclei with charge=2. In this talk, we will report the preliminary results of Monte-Carlo simulations for the environment of the STAR HLT. The simulations include application of GPU for secondary vertex finding and the HLT tracking efficiency. The HLT's performance and its scalability will also be discussed. [Preview Abstract] |
Sunday, May 1, 2011 2:54PM - 3:06PM |
J7.00008: e+A physics at an Electron-Ion Collider Matthew Lamont It is believed that the dense matter crated in A+A collisions at RHIC and LHC evolves from an initial state involving the collision of soft gluon fields of each nucleus rapidly producing a thermalized state. These fields in the relevant region are only vaguely known. In e+A collisions, the final state interactions are absent and the initial conditions are not wiped out by the evolving system. This, coupled with the fact that the kinematics of the partonic interactions can be fully controlled in DIS, makes electron-ion collisions the ideal tool to study the nature of the initial state. In this talk I will review the capabilities and aspirations of the physics obtainable with e+A collisions at a future eRHIC collider. [Preview Abstract] |
Sunday, May 1, 2011 3:06PM - 3:18PM |
J7.00009: A Novel Detector for High Flux Thermal Neutrons Elise Martin, Septimiu Balascuta, David Bowman, Chris Crawford, Charles Fieseler, Nadia Fomin, Kyle Grammer, Geoffrey Greene, Seppo Penttila The NPDGamma experiment at the SNS measures the parity-violating gamma asymmetry, $A_\gamma$, in the $\vec{n} + p \rightarrow d + \gamma$ reaction to set limits to the $f_\pi$ contribution in the weak hadronic potential. The projected sensitivity is $\delta A_\gamma=10^{-8}$. To verify we can achieve the required counting statistics we must know the neutron flux. We have built a novel, absolutely calibrated, high dynamic range neutron detector, which uses a boron target in the neutron beam to produce a single, monoenergetic, gamma ray per captured neutron. The gamma rays are then detected by a CsI crystal and viewed by a vacuum photo-diode. The absolute flux and beam profile are obtained by scanning the detector across the beam. In addition to the absolute beam flux measurement, the detector has been used to define the beam position after the reflecting supermirror polarizer. The detector will be used also to align accurately the gamma detector array of the experiment, minimizing false asymmetries. We will describe the neutron detector, its calibration, and results for neutron flux and beam profile data for the FNPB beam line at the SNS, where the NPDGamma experiment is installed. [Preview Abstract] |
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