Bulletin of the American Physical Society
APS April Meeting 2015
Volume 60, Number 4
Saturday–Tuesday, April 11–14, 2015; Baltimore, Maryland
Session E16: Particle Detectors II |
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Sponsoring Units: DPF Chair: Michael Tuts, Columbia University Room: Key 12 |
Saturday, April 11, 2015 3:30PM - 3:42PM |
E16.00001: 35t Prototype Detector for Experiment at Long Base Line Neutrino Facility (ELBNF) Far Detector Gabriel Santucci The 35ton prototype detector is a Liquid Argon Time Projection Chamber (LAr TPC) utilizing a membrane cryostat. It serves as a prototype for testing technology proposed for the ELBNF far detector. The construction of the prototype is an essential part of the ELBNF project due to the large amount of new technologies introduced for the far detector. In early 2014, it was shown that the membrane cryostat technology was able to reach and maintain the required LAr purity and an electron lifetime of 2.5 ms was achieved. The goals for the next phase include the installation of a fully functional TPC using the novel designs for the ELBNF far detector as much as possible. This includes the installation of the cold electronics, scintillation photon detectors and multiple Anode Plane Arrays with wrapped wires. In this talk I will review the status of the 35t prototype detector and describe what has been accomplished during 2014 and early 2015, including the commissioning phase and the early stages of data taking from cosmic-rays. [Preview Abstract] |
Saturday, April 11, 2015 3:42PM - 3:54PM |
E16.00002: Measurement of Electron Transportation Properties in Liquid Argon for Large Liquid Argon Time Projection Chambers Jyoti Joshi, Yichen Li, Xin Qian, Craig Thorn Liquid Argon (LAr) Time Projection Chambers (TPCs) provide a powerful, robust and elegant solution for the detection of neutrinos and other weakly interacting particles above a few tens of MeV. An energetic charged particle transiting the liquid produces ionization electrons that are drifted with constant velocity along a uniform electric field. By detecting the location and timing of the arrival of these electrons on a readout plane, LArTPCs provide 3D imaging of interaction events with excellent spatial resolution. During the drift to the readout plane, the ionization electrons diffuse. The resulting increase in the size of the charge distribution is one fundamental limitation to reach high spatial resolution at long drift distance. In addition, accurate modeling of the LArTPCs performance requires an accurate knowledge of the diffusion. In this talk, we report the measurement of longitudinal electron diffusion coefficients for a range of electric fields, which is directly applicable to existing LAr TPC experiments such as MicroBooNE. We also present the ongoing R{\&}D to advance our knowledge of LAr properties at BNL, which are essential for the design and optimal operation of future large LArTPCs such as the proposed LBNF far detector [Preview Abstract] |
Saturday, April 11, 2015 3:54PM - 4:06PM |
E16.00003: Large Area Pico-second Photodetectors (LAPPD) in Liquid Argon Ranjan Dharmapalan The Large Area Pico-second Photodetector (LAPPD) project has recently produced the first working devices with a small form factor and pico-second timing resolution. A number of current and proposed neutrino and dark matter experiments use liquid argon as a detector medium. A flat photodetector with excellent timing resolution will help with background suppression and improve the overall sensitivity of the experiment. We present the research done and some preliminary results to customize the LAPPD devices to work in a cryogenic environment. [Preview Abstract] |
Saturday, April 11, 2015 4:06PM - 4:18PM |
E16.00004: Production of 6cm x 6cm Micro-channel Plate Based Picosecond Photodetectors with the Argonne Small Tile Processing System (STPS) Lei Xia, Karen Byrum, Marcel Demarteau, Robert Wagner, Dean Walters, Jingbo Wang, Junqi Xie, Huyue Zhao Microchannel plate (MCP) based photodetectors feature fast timing, good position resolution and compact form factor. However, traditional MCP photodetectors suffer from limited charge lifetime and high cost. The LAPPD collaboration, over the years, developed Atomic Layer Deposition (ALD) coated new generation MCP's and low cost glass packaging technology. Recently, the Argonne group commissioned its small form factor tile processing system and produced the first fully processed sealed photodetectors with glass packaging, using the ALD coated MCP's. We report the design, construction and commissioning of the system, and production of the first devices. [Preview Abstract] |
Saturday, April 11, 2015 4:18PM - 4:30PM |
E16.00005: Performance of 6cmx6cm MCP-based picosecond photo-detectors Jingbo Wang, Junqi Xie, Robert Wagner, Dean Walters, Karen Byrum, Lei Xia, Allen Zhao, Edward May, Marcel Demarteau Microchannel plate (MCP)-based photo-detectors are capable of micron-level spatial imaging and picosecond-level timing resolution, making them a promising candidate for the next generation high-precision photo-detectors. Argonne National Laboratory (ANL) is currently producing 6x6~cm$^2$, cost-effective, thin planar, glass-body, MCP-based photo-detectors at a newly constructed production system. An indium sealing technique was successfully developed for a permanent detector seal and a several photo-detectors have been produced. The performance of the photo-detectors were characterized with a pulsed laser facility, showing a ~60~ps Transit Time Spread (TTS) resolution and \textless 500~$\mu$m spatial resolution. The test setup, data acquisition, data analysis and the experimental results will be presented and discussed. [Preview Abstract] |
Saturday, April 11, 2015 4:30PM - 4:42PM |
E16.00006: Development of a flexible trigger board for LBNE 35t prototype Nuno Barros Part of the LBNF program, a 35t LAr TPC prototype is being built at Fermilab to demonstrate the functioning of the different detector readout technologies planned for the full scale detector. The LBNE 35t prototype is planned to take cosmic muon data and thus make a proof of concept for the single phase LAr technology. This will contain prototypes of all detection systems planned to be used in the final detector design. Additionally, a series of refurbished scintillation panels will also be deployed for detection of passing muons. In order to combine and filter the data from all the detection systems, a trigger board was designed. Using a AVNET MicroZed FPGA board, a lot of flexibility is obtained in terms of the trigger logic, being easily adaptable to different applications. In LBNE 35t, it acts as a first stage trigger, collecting the inputs from all detection systems, applying the implemented logic and a first data filter, and passing the information downstream into the software DAQ cluster. In this talk a description of the board, along with its main features will be provided, along with its application in the 35t prototype. [Preview Abstract] |
Saturday, April 11, 2015 4:42PM - 4:54PM |
E16.00007: Study of the time evolution of hadronic and electromagnetic showers Dmitri Denisov, Nikolai Mokhov, Sergei Striganov Precision time determination for particles detection is critical for future detectors including high energy and high luminosity colliders in order to reject substantial out of time backgrounds. Such backgrounds could be coming from beams radiation for electron or muon colliders or from additional interactions in the same bunch crossing for hadron colliders. We will present recent results, based on modern simulation tools, of the space-time evolution for electromagnetic and hadronic showers which are typically used to detect electrons and photons or jets in the collider experiments. Our results demonstrate sub-nanosecond time resolution for detectors with fine spatial segmentation which provides excellent potential for use of such detectors in the future experiments. [Preview Abstract] |
Saturday, April 11, 2015 4:54PM - 5:06PM |
E16.00008: Image Classification Applied to High Energy Physics Events Jonathan Timcheck, Richard Hughes, Garrett Merz, Brian Winer We present a method for applying image classification algorithms to signal discrimination in high energy physics events. Deep Convolutional Neural Networks (DCNNs), state-of-the-art computational models inspired by the visual cortex, are trained to distinguish top-quark pair events from W$+$4jets events by looking at the electromagnetic and hadronic calorimeters of a generalized detector as an unrolled, flat image. DCNNs are capable of learning compact hierarchical representations, i.e., the important features in these events, and subsequently aggregate these features to perform classification. Our method yields performance competitive with that of traditional analyses and may be a useful tool in the upcoming higher-energy, higher-luminosity environment at the LHC due to its lack of dependence on isolated objects. [Preview Abstract] |
Saturday, April 11, 2015 5:06PM - 5:18PM |
E16.00009: Triple GEM detector sensitivity simulations with Geant4 for the CMS Forward Muon Upgrade at CERN LHC Florian Zenoni Triple Gas Electron Multiplier (GEM) detectors are being developed for the forward muon upgrade of the CMS experiment in Phase 2 of the CERN LHC. After the second long LHC shutdown, their implementation will take place for the GE1/1 system in the $1.5 < | \eta | < 2.2$ region of the muon endcap. This upgrade aims at controlling muon level-1 trigger rates, thanks to their high performance in extreme particle rates ($\sim$ MHz/cm$^2$). Moreover, the GEM technology can improve the muon track reconstruction and identification capabilities of the forward detector. The Triple GEMs will work in a hostile radiation background (several hundreds of Hz/cm$^2$) mostly made of photons, neutrons, electrons and positrons. To understand how this background could affect the detectors' functionality it is important to know the sensitivity to these kinds of radiation. The goal of this work is to estimate the sensitivity of Triple GEMs to background particles in the CMS cavern environment, thanks to the latest updates of GEANT4, a toolkit for the simulation of the passage of particles through matter. [Preview Abstract] |
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