Bulletin of the American Physical Society
2017 Fall Meeting of the APS Division of Nuclear Physics
Volume 62, Number 11
Wednesday–Saturday, October 25–28, 2017; Pittsburgh, Pennsylvania
Session 1WC: Advances in Particle Detectors |
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Chair: Brian Quinn, Carnegie Mellon University Room: Marquis C |
Wednesday, October 25, 2017 9:00AM - 9:30AM |
1WC.00001: Gaseous Electron Multiplier (GEM) Detectors Invited Speaker: Kondo Gnanvo Gaseous detectors have played a pivotal role as tracking devices in the field of particle physics experiments for the last fifty years. Recent advances in photolithography and micro processing techniques have enabled the transition from Multi Wire Proportional Chambers (MWPCs) and Drift Chambers to a new family of gaseous detectors refer to as Micro Pattern Gaseous Detectors (MPGDs). MPGDs combine the basic gas amplification principle with micro-structure printed circuits to provide detectors with excellent spatial and time resolution, high rate capability, low material budget and high radiation tolerance. Gas Electron Multiplier (GEMs) is a well-established MPGD technology invented by F. Sauli at CERN in 1997 and deployed various high energy physics (HEP) and nuclear NP experiment for tracking systems of current and future NP experiments. GEM detector combines an exceptional high rate capability (1 MHz / mm$^{\mathrm{2}})$ and robustness against harsh radiation environment with excellent position and timing resolution performances. Recent breakthroughs over the past decade have allowed the possibility for large area GEMs, making them cost effective and high-performance detector candidates to play pivotal role in current and future particle physics experiments. After a brief introduction of the basic principle of GEM technology, I will give a brief overview of the GEM detectors used in particle physics experiments over the past decades and especially in the NP community at Thomas Jefferson National Laboratory (JLab) and Brookhaven National Laboratory (BNL). I will follow by a review of state of the art of the new GEM development for the next generation of colliders such as Electron Ion Collider (EIC) or High Luminosity LHC and future Nuclear Physics experiments. I will conclude with a presentation of the CERN-based RD51 collaboration established in 2008 and its major achievements regarding technological developments and applications of MPGDs. [Preview Abstract] |
Wednesday, October 25, 2017 9:30AM - 10:00AM |
1WC.00002: Novel Micromegas trackers Invited Speaker: Franck Sabatie The latest development in Micromegas trackers includes the Micromegas Vertex Tracker (MVT) soon to be installed in Jefferson Lab Hall B, in the CLAS12 central tracking system. The MVT is composed of 6 cylindrical layers and 6 flat disks of resistive bulk Micromegas detectors. They have been designed to withstand the high particle flux environment and the high magnetic field using a low material budget of less than 0.5{\%} of a radiation length per detector. The MVT is read out using front-end electronics based on the ``Dream'' Asic developed at CEA Saclay/Irfu. The low material budget requirements and very stringent space restrictions of the central tracking system surrounded by a 5T solenoid prevent the use of on-detector frontend electronics. The ability of the Dream chip to work with high-capacitance detectors allows deploying the electronics some 2 m away using flat micro-coaxial cables. After a short introduction to Micromegas detectors and the state-of-the-art achievements in this technology, I will focus on the CLAS12 MVT detector system, from the fabrication techniques to the readout electronics. Possible future developments will briefly be presented as well. [Preview Abstract] |
Wednesday, October 25, 2017 10:00AM - 10:30AM |
1WC.00003: Plasma-panel based detectors Invited Speaker: Peter Friedman The plasma panel sensor (PPS) is a novel micropattern gas detector inspired by plasma display panels (PDPs), the core component of plasma-TVs. A PDP comprises millions of discrete cells per square meter, each of which, when provided with a signal pulse, can initiate and sustain a plasma discharge. Configured as a detector, a pixel or cell is biased to discharge when a free-electron is generated in the gas. The PPS consists of an array of small plasma discharge pixels, and can be configured to have either an ``open-cell'' or ``closed-cell'' structure, operating with high gain in the Geiger region. We describe both configurations and their application to particle physics. The open-cell PPS lends itself to ultra-low-mass, ultrathin structures, whereas the closed-cell microhexcavity PPS is capable of higher performance. For the ultrathin-PPS, we are fabricating 3-inch devices based on two types of extremely thin, inorganic, transparent, substrate materials: one being 8-10 \textmu m thick, and the other 25-27 \textmu m thick. These gas-filled ultrathin devices are designed to operate in a beam-line vacuum environment, yet must be hermetically-sealed and gas-filled in an ambient environment at atmospheric pressure. We have successfully fabricated high resolution, submillimeter pixel electrodes on both types of ultrathin substrates. We will also report on the fabrication, staging and operation of the first microhexcavity detectors (\textmu H-PPS). The first \textmu H-PPS prototype devices have a 16 by 16 matrix of closed packed hexagon pixels, each having a 2 mm width. Initial tests of these detectors, conducted with Ne based gases at atmospheric pressure, indicate that each pixel responds independent of its neighboring cells, producing volt level pulse amplitudes in response to ionizing radiation. Results will include the hit rate response to a radioactive beta source, cosmic ray muons, the background from spontaneous discharge, pixel isolation and uniformity, and efficiency measurements. [Preview Abstract] |
Wednesday, October 25, 2017 10:30AM - 11:00AM |
1WC.00004: COFFEE BREAK
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Wednesday, October 25, 2017 11:00AM - 11:30AM |
1WC.00005: Hybrid RICH detector Invited Speaker: Patrizia Rossi A large area ring-imaging Cherenkov detector has been designed to provide clean hadron identification capability in the momentum range from 3~GeV/c to 8~GeV/c for the CLAS12 experiments at the upgraded 12~GeV Continuous Electron Beam Accelerator Facility (CEBAF) of Jefferson Lab. The adopted solution foresees a novel hybrid optics design based on an aerogel radiator, composite mirrors, and a densely packed and highly segmented photon detector (multi-anode photomultiplier tubes). Depending on the incident particle track angle, Cherenkov light will either be imaged directly (forward tracks) or after two reflections and passes through the aerogel (large angle tracks). The installation of the RICH detector in CLAS12 is scheduled for the fall 2017. In this presentation the detector design will be described, along with the results on individual detector components tests and from testbeam and cosmic ray studies. [Preview Abstract] |
Wednesday, October 25, 2017 11:30AM - 12:00PM |
1WC.00006: Development of fast-timing microchannel plate photomultiplier Invited Speaker: Junqi Xie Planar microchannel plate photomultipliers (MCP-PMTs) with bialkali photocathodes are able to achieve single photon detection with excellent time (picosecond) and spatial (millimeter) resolution. They have recently drawn great interests in experiments requiring time of flight (TOF) measurement and/or Cherenkov imaging. The Argonne MCP-PMT detector group has recently designed and fabricated 6 cm x 6 cm MCP-PMTs. Atomic layer deposition (ALD) method is used to grow resistive and secondary emission layers to functionalize the glass capillary array. Initial characterization indicates that these MCP-PMTs exhibits a transit-time spread of 57 psec at single photoelectron detection mode and of 27 psec at multi photoelectron mode (\textasciitilde 100 photoelectrons). The MCP-PMTs were also tested at Fermilab test beam facility for its particle detection performance and rate capability, showing high rate capability up to 75 kHz/cm2, higher than the requirement for future electron-ion collider (EIC) experiment. A recent magnetic field test at ANL g-2 magnetic facility shows that the gain of MCP-PMT does not degrade until 0.75 Tesla, comparable to the current commercially available MCP-PMTs. Further improvement of its magnetic field performance is currently under developing by reducing the MCP pore size and spacing between inside components. The progress on the MCP-PMT development at ANL will be presented and discussed in the presentation. [Preview Abstract] |
Wednesday, October 25, 2017 12:00PM - 12:30PM |
1WC.00007: Quantum Dots in Liquid Scintillator Invited Speaker: Diana Gooding Quantum dots are semiconducting crystals with dimensions on the order of nanometers. Due to quantum confinement, their size gives rise to optical properties that resemble those of single atoms, rather than bulk material. One of these is their absorption of light shorter than a characteristic wavelength and reemission in a narrow peak around that wavelength. This unique photoluminescence makes quantum dots ideal wavelength shifters. Moreover, their chemistry provides a straight-forward method to suspend heavy elements in organic scintillators. The NuDot collaboration has been pursuing a variety of new quantum dots, and a review of the current results will be presented. [Preview Abstract] |
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