Bulletin of the American Physical Society
APS April Meeting 2016
Volume 61, Number 6
Saturday–Tuesday, April 16–19, 2016; Salt Lake City, Utah
Session U17: Liquid Argon Neutrino Instrumentation |
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Sponsoring Units: DPF Chair: Mark Thomson, University of Cambridge Room: 251E |
Monday, April 18, 2016 3:30PM - 3:42PM |
U17.00001: First Results from the DUNE 35-ton Prototype using Cosmics Jonathan Insler The 35-ton prototype for the Deep Underground Neutrino Experiment (DUNE) Far Detector is a single-phase liquid argon time projection chamber (LAr-TPC) integrated detector that will take cosmics data for a two month run beginning in February 2016. The 35-ton prototype will characterize DUNE's Far Detector technology performance and provide a sample of real data for DUNE reconstruction algorithms. The 35-ton prototype has two drift volumes of lengths 2.23 m and 0.23 m on either side of its anode plane assembly (APA) and makes use of wire planes with wrapped wires and a photon detection system (PDS) utilizing photon detection panels read out by silicon photomultipliers (SiPMs). Data from the 35-ton LAr detector are expected to provide rich information on scintillation light and charged particle tracks. We present a preliminary analysis of cosmics data taken with the 35-ton detector with a focus on stopping muons. [Preview Abstract] |
Monday, April 18, 2016 3:42PM - 3:54PM |
U17.00002: Argon-39 Background in DUNE Photon Detectors Gleb Sinev The Deep Underground Neutrino Experiment (DUNE) is a $40$-kt liquid argon detector that will be constructed $5000$~ft underground in the Sanford Underground Research Facility in order to study neutrino and proton decay physics. Instrumenting liquid argon with photon detectors to record scintillation in addition to the ionization signal can significantly improve time and energy resolution of the experiment. Argon produces light with wavelength of $128$~nm. The reference design for the photon detectors includes acrylic bars covered in wavelength shifter, where the scintillation light can be captured and reemitted with longer wavelengths, then detected using silicon photomultipliers. Radiological backgrounds may noticeably deteriorate the photon detection system performance, especially for low-energy interactions. A particularly important background comes from argon-39 decays, because argon-39 is present in natural argon that will be used in DUNE and the background rate increases with the size of the experiment. The effect of the argon-39 background has been studied and is presented in this talk. [Preview Abstract] |
Monday, April 18, 2016 3:54PM - 4:06PM |
U17.00003: Wire-Cell Tomographic Event Reconstruction for large LArTPCs Xin Qian, Brett Viren, Chao Zhang Event reconstruction is one of the most challenging tasks in analyzing the data from current and future large liquid argon time projection chambers (LArTPCs). The performance of the event reconstruction holds the key to many potential future discoveries with the LArTPC technology including i) searching for new CP violation in the leptonic sector, ii) determining the neutrino mass hierarchy, and iii) searching for additional light (sterile) neutrino species. In this talk, we introduce a new reconstruction method: Wire-Cell [1]. The principle of Wire-Cell strictly follows the principle of LArTPC, that is, the same amount of ionization electrons are observed by all the wire-planes. Using both time and charge information, 3D image of the event topologies are firstly obtained. Further reconstruction steps including the clustering, tracking, and particle identifications (PID) are then directly applied to the 3D image. The principle, current status, and future development plan of Wire-Cell will be described. The results of Wire-Cell event reconstruction will be shown with an innovative web-based “BEE” 3D event display. [1] http://www.phy.bnl.gov/wire-cell/ [Preview Abstract] |
Monday, April 18, 2016 4:06PM - 4:18PM |
U17.00004: Simulations of Charged-Current Supernova $\nu_e$ Events in a Liquid Argon Time Projection Chamber Steven Gardiner, Christopher Grant, Emilija Pantic, Robert Svoboda Although it is still in its infancy, the study of supernova neutrinos has proven to be a fertile topic for fundamental science. A mere two dozen events recorded from supernova 1987A, the only supernova neutrino source observed so far, have led to numerous publications on a wide variety of topics. This bountiful scientific harvest has prompted the neutrino physics community to prepare to make more detailed observations of the neutrinos that will be produced in the next nearby supernova. Because of their unique $\nu_e$ sensitivity, liquid argon time projection chamber (LArTPC) experiments such as DUNE (Deep Underground Neutrino Experiment) have the potential to make valuable contributions to this detection effort. To better understand the expected SN $\nu_e$ signal in a LArTPC, we have developed a Monte Carlo event generator called MARLEY (Model of Argon Reaction Low-Energy Yields) for charged-current $\nu_e$ reactions on argon. By combining MARLEY with LArSoft, a LArTPC simulation package, we have obtained the most detailed predictions currently available for the response of a LArTPC to supernova $\nu_e$. We will discuss the implications of these results for the design and operation of LArTPCs sensitive to SN neutrinos. [Preview Abstract] |
Monday, April 18, 2016 4:18PM - 4:30PM |
U17.00005: ABSTRACT WITHDRAWN |
Monday, April 18, 2016 4:30PM - 4:42PM |
U17.00006: LArIAT Pion Absorption Analysis Andrew Olivier The Liquid Argon Time Projection Chamber in a Test Beam (LArIAT) experiment at the Fermilab Test Beam Facility exposes a liquid argon time projection chamber (LArTPC) to a test beam to study LArTPC responses to a variety of charged particles. LArIAT completed its first data-taking run in 2015, so efforts are now underway to develop data analysis techniques for identifying charged particle events and studying cross sections in liquid argon. Methods for analyzing the pion absorption and charge exchange cross section in LArIAT will be presented including a likelihood-based particle identification algorithm. Event identification techniques and cross section measurements from LArIAT can be applied directly or further developed to improve precision in DUNE reconstruction and analysis. [Preview Abstract] |
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