Bulletin of the American Physical Society
APS April Meeting 2014
Volume 59, Number 5
Saturday–Tuesday, April 5–8, 2014; Savannah, Georgia
Session J12: Instrumentation & Methods I |
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Sponsoring Units: DPF Chair: Mike Tuts, Columbia University Room: 100 |
Sunday, April 6, 2014 10:45AM - 10:57AM |
J12.00001: Data acquisition system for the n$^{3}$He experiment Latiful Kabir The n$^{3}$He experiment at the Spallation Neutron Source will measure the parity violating spin asymmetry of the recoil proton in the reaction n$+^{3}$He$\to $p $+$T$+$765 KeV. This is sensitive to $\Delta $I$=$0 and 1 components of the Hadronic Weak Interaction (HWI), and is expected to be extremely small (of the order 10$^{-7})$.Protons from the reaction are recorded in current mode in order to achieve a statistical sensitivity of 10$^{-8}$ in a reasonable amount of time.In addition instrumental asymmetries must be suppressed by an additional order of magnitude.The asymmetry is measured as a function of time-of-flight of the neutron to study the energy dependence of any systematic effects.We will present details and preliminary tests of the 144 channel data acquisition system designed to meet these requirements. [Preview Abstract] |
Sunday, April 6, 2014 10:57AM - 11:09AM |
J12.00002: Solid xenon radiation detectors Michelle J. Dolinski Cryogenic liquid xenon detectors have become a popular technology in the search for rare events, such as dark matter interactions and neutrinoless double beta decay. The power of the liquid xenon detector technology is in the combination of the ionization and scintillation signals, resulting in particle discrimination and improved energy resolution over the ionization-only signal. The improved energy resolution results from a unique anti-correlation phenomenon that has not been described from first principles. Solid xenon bolometers, under development at Drexel University, are expected to have excellent counting statistics in the phonon channel, with energy resolution of 0.1\% or better. This additional energy channel may offer the final piece of the puzzle in understanding liquid xenon detector energy response. [Preview Abstract] |
Sunday, April 6, 2014 11:09AM - 11:21AM |
J12.00003: Capacitive coupling based wire chamber diagnostic system Gabriel Collin This talk describes a method for inducing charge on a wire plane by pulsing a capacitively coupled antenna. This is designed to aid other systems in diagnosing wire integrity. Results from studying a prototype with the MicroBooNE TPC will be presented. [Preview Abstract] |
Sunday, April 6, 2014 11:21AM - 11:33AM |
J12.00004: ABSTRACT WITHDRAWN |
Sunday, April 6, 2014 11:33AM - 11:45AM |
J12.00005: A measurent on proportional scintillation properties in liquid xenon Junji Naganoma I present a property measurement on proportional scintillation in liquid xenon (LXe). LXe time projection chamber (TPC) has superior features for the direct detections of weekly interacting massive particle (WIMP) due to its high density, usability of scintillation and ionization signals for particle identification, capability of position reconstruction, relatively higher WIMP cross section, and sensitivity to spin-independent and spin-dependent interactions. Currently XENON and LUX collaborations utilize liquid-gas double-phase Xe detectors, denser liquid phase is for WIMP interaction, and gas phase is for ionization signal detection. There are some technical difficulties for future larger size double-phase Xe detector, such as precise liquid level control and high cathode voltage to keep ~1kV/cm electric field. Single phase TPC using proportional scintillation in LXe can overcome these difficulties since liquid level control is not necessay and cathode voltage can be reduced while keeping the same electric field by arraging electrodes properly. To test the feasibility of the concept we measured the properties of proportional scintillation in LXe using thin wire and gas electron multiplier at Columbia University Nevis labs. [Preview Abstract] |
Sunday, April 6, 2014 11:45AM - 11:57AM |
J12.00006: Kimballton Underground Research Facility Steven Derek Rountree The Kimballton Underground Research Facility (KURF) is an operating deep underground research facility with six active projects, and greater than 50 trained researchers. KURF is 30 minutes from the Virginia Tech (VT) campus in an operating limestone mine with drive-in access (eg: roll-back truck, motor coach), over 50 miles of drifts (all 40' x 20$+$'; the current lab is 35' x 22' x 100'), and 1700' of overburden (1450m.w.e.). The laboratory was built in 2007 and offers fiber optic internet, LN2, 480/220/110 V power, ample water, filtered air, 55 F constant temp, low Rn levels, low rock background activity, and a muon flux of only $\sim $0.004 muons per square meter, per second, per steradian. The current users are funded by NSF, DOE, and NNSA. Current user group: 1) mini-LENS (VT, Louisiana State University, BNL); 2) Double Beta Decay to Excited States (Duke University); 3) HPGe Low-Background Screening (University of North Carolina (UNC), VT); 4) MALBEK (UNC); 5{\&}6) Watchman -- 5) Radionuclide Detector and 6) MARS detector (LLNL, SNL, UC-Davis, UC-Berkeley, UH, Hawaii Pacific, UC-Irvine, VT) [Preview Abstract] |
Sunday, April 6, 2014 11:57AM - 12:09PM |
J12.00007: ABSTRACT WITHDRAWN |
Sunday, April 6, 2014 12:09PM - 12:21PM |
J12.00008: Design, Production and Testing of Cost-Effective, Large-Area, MCP-based Planar Photodetectors Junqi Xie, Karen Byrum, Marcel Demarteau, John Noonan, Sagar Setru, Mathew Virgo, Robert Wagner, Dean Walters, Xing Wang, Lei Xia, Huyue Zhao Microchannel plate (MCP)-based photodetectors with large-area, thin planar geometry and glass-body assembly, are considered as next generation photodetector to replace photomultiplier tubes. They have shown significant potential for applications in high energy collider physics and astrophysics. Due to the extreme sensitivity of the photocathode to water and oxygen, the production of this kind of photodetectors requires photocathodes to be transferred under high vacuum. A new photodetector production facility at Argonne National Laboratory was designed and constructed. The facility aims to produce small form-factor, MCP-based photodetectors completely made out of glass. 6 x 6 cm$^{2}$ photodetectors using metal and alkali antimonide as photocathode are currently under production. An overview of the production sequence and first performance results will be presented. Scaling up the production to larger form-factor devices will be discussed. The challenge of sealing a large area photodetector has recently been overcome. Windows with 20x20cm$^{2}$ active photocathode area were successfully sealed and progress towards large-area photodetector production progress will be reported. [Preview Abstract] |
Sunday, April 6, 2014 12:21PM - 12:33PM |
J12.00009: Applying Machine Learning to GlueX Data Analysis Thomas Boettcher GlueX is a high energy physics experiment with the goal of collecting data necessary for understanding confinement in quantum chromodynamics. Beginning in 2015, GlueX will collect huge amounts of data describing billions of particle collisions. In preparation for data collection, efforts are underway to develop a methodology for analyzing these large data sets. One of the primary challenges in GlueX data analysis is isolating events of interest from a proportionally large background. GlueX has recently begun approaching this selection problem using machine learning algorithms, specifically boosted decision trees. Preliminary studies indicate that these algorithms have the potential to offer vast improvements in both signal selection efficiency and purity over more traditional techniques. [Preview Abstract] |
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