Bulletin of the American Physical Society
2011 Annual Meeting of the Four Corners Section of the APS
Volume 56, Number 11
Friday–Saturday, October 21–22, 2011; Tuscon, Arizona
Session D5: Detectors for High-Energy Physics |
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Chair: Shufang Su, University of Arizona Room: UA Student Union Presidio |
Friday, October 21, 2011 2:00PM - 2:12PM |
D5.00001: Preliminary Design of the Gas Cherenkov Muon Monitors for LBNE Craig Pitcher I am performing preliminary research for a future neutrino experiment at Fermilab called the Long Baseline Neutrino Experiment (LBNE). More specifically, I am determining the best geometry for the gas Cherenkov muon monitors. The purpose of the monitors is to measure, at least indirectly, the energy spectrum of the muons in the beam. I use computer software to simulate a realistic muon beam going through the monitors. Muons in the particle beam that go through the monitors emit Cherenkov radiation, and this light is detected by PMTs. I then plot the number of photons detected as a function of the muon's energy that emitted the detected photons. My goal is to have a very narrow peak on this plot. This peak shifts depending on the simulated index of refraction. The best design for the monitors is an L-shaped pipe filled with Freon gas of adjustable density. It is the simplest and cheapest to build of all the designs I tried, and it can accurately recover the muon energy spectrum based solely on the total number of photons detected in each pulse: using simulation data from 5 indices of refraction, I can recover the muon energy spectrum (within the uncertainties) of a beam that has 5 discrete muon energies. [Preview Abstract] |
Friday, October 21, 2011 2:12PM - 2:24PM |
D5.00002: Measuring Charge Collection Efficiency in Diamond Vertex Detectors Brian Josey, Sally Seidel, Martin Hoeferkamp As currently used at the Large Hadron Collider, vertex detectors are composed primarily of silicon sensors that image particle tracks by detecting the creation of electron-hole pairs caused by the excitation of the silicon atoms. We are investigating replacing these silicon detectors with detectors made out of diamond. Diamond is advantageous due to its radiation hardness. We are measuring the charge collection efficiency of diamond as a function of fluence. We are building a characterization station. Diamond samples will be placed into the characterization station and exposed to a strontium-90 beta source, before and after I irradiate them with 800 MeV protons at LANL. The radiation from the Sr-90 source will create electron-hole pairs. These will be read out by applying an electric field across the sample. The system is triggered by a scintillator-photomultiplier tube assembly. The goal of this measurement is to record collected charge as a function of bias voltage. The diamond charge collection data will be compared to silicon and predictions about detector operation at the LHC will be made. [Preview Abstract] |
Friday, October 21, 2011 2:24PM - 2:36PM |
D5.00003: Micromegas Detectors for an Upgraded ATLAS Detector at the High Luminosity LHC Jason Veatch, Kenneth Johns, Venkat Kaushik To cope with increased background rates and degraded muon detector performance at proposed luminosities that exceed the nominal LHC luminosity, we are investigating the use of large, bulk Micromegas for the Small Wheel upgrade at ATLAS. We describe several different prototypes that have have been constructed to minimize sparking and provide two-dimensional readout. We also describe a large area prototype of a size needed for the ATLAS Small Wheel. The use of Micromegas in Time Projection Chamber mode was studied with two different types of front-end electronics and results from recent test beam runs are presented. [Preview Abstract] |
Friday, October 21, 2011 2:36PM - 2:48PM |
D5.00004: A Wavelength-shifting Light Collector for the LBNE Far Detector William Johnston, Norm Buchanan The Long Baseline Neutrino Experiment (LBNE) is a proposed neutrino oscillation experiment designed to look for CP-violation in the neutrino sector as well as to measure the neutrino mixing angle $\theta _{13}$. In addition, the far detector has the goals of measuring neutrinos from supernovae as well as being able to search for proton decay with sensitivity beyond current limits. One proposed far detector is a 200 kton water Cerenkov detector. A light collection system is being investigated for this detector that will enable a reduction in the number of photomultiplier tubes needed, resulting in a considerable cost reduction while preserving the physics potential of the experiment. Measurements and simulations of one light collector design, based on flat wavelength-shifting plates, will be presented. [Preview Abstract] |
Friday, October 21, 2011 2:48PM - 3:00PM |
D5.00005: Estimating Neutrino Oscillation Parameter Sensitivities for LBNE with GLoBES Matthew Bass, Robert Wilson The Long Baseline Neutrino Experiment (LBNE) is being designed primarily to explore the neutrino mixing parameters. With a proposed baseline of 1300 km, the experiment will be especially capable in searching for CP violation and determining the neutrino mass hierarchy. It is critical to determine the experimental requirements in terms of the physics goals of sensitivity to CP violation, mass hierarchy, and $\theta_{13}$ in a $\nu_{\mu}$ to $\nu_{e}$ oscillation analysis. In this study the General Long Baseline Experiment Simulator (GLoBES) is used to characterize sensitivity to these parameters in terms of detector technology (Liquid Argon or Water Cerenkov), neutrino running times, and background systematics. [Preview Abstract] |
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