Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session DM: Instrumentation II |
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Chair: Alexandra Gade, Michigan State University Room: Hilton Queen's 6 |
Thursday, October 25, 2018 9:00AM - 9:15AM |
DM.00001: Abstract Withdrawn
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Thursday, October 25, 2018 9:15AM - 9:30AM |
DM.00002: Progress report on CHICO-X upgrade Ching-Yen Wu CHICO-X upgrade project was approved by DOE/NP in FY17 and is funded over a three-year period beginning in FY18. The first-year effort focuses on the redesign of detector chamber and pixelated position-sensing board, to be fully integrated into GRETA. The preliminary design will be completed by the end of FY18 and the final design will be achieved after checking the compatibility with the GRETA mounting frame. The major changes include the sliding O-ring seal for the pressure window and the integrated design for detector chamber. The extra space freed from the reconfigured pixelated position-sensing board, which has a shorter coverage of scattering angle, allows a more solid contact between the anode and the transmission line by modifying the pressing mechanism. Some detailed design will be presented. |
Thursday, October 25, 2018 9:30AM - 9:45AM |
DM.00003: Implementing a gas jet target inside the solenoidal spectrometer HELIOS Holly G Stemp, Kelly A. Chipps, Steven D. Pain, David G Walter, Michael T Febbraro The benefits of using a solenoidal spectrometer to study nuclear reactions in inverse kinematics include improved effective energy resolution through the elimination of kinematic compression. However, target-induced effects, such as the energy loss of the beam and reaction products, can limit solenoidal spectrometers from achieving this idealised resolution. Solid targets and gas cells possess a number of inherent issues, related to energy loss and significant background reactions, which have a detrimental effect on the energy and angular resolution that can be achieved. The Jet Experiments in Nuclear Structure and Astrophysics (JENSA) system is a windowless supersonic gas jet target able to provide localised densities of over 5x1018 atoms/cm2, with significantly fewer contaminants and less energy and angle straggling than many traditional targets. Here we present the first steps towards implementing a gas jet target similar to JENSA inside the solenoidal spectrometer HELIOS at Argonne National Laboratory, with preliminary gas flow tests performed using a prototype setup at Oak Ridge National Laboratory. |
Thursday, October 25, 2018 9:45AM - 10:00AM |
DM.00004: A high-resolution dipole spectrometer for low-energy electron scattering to determine proton charge radius Taihei Aoyagi, Yuki Honda, Keita Kasama, Yukie Maeda, Toshiya Muto, Kazuki Namba, Ken'ichi Nanbu, Toshimi Suda, Ken Takahashi, Shota Takayama, Tadaaki Tamae, Kyo Tsukada The proton radius puzzle is the discrepancy between the proton radius determined by electron scattering and hydrogen spectroscopy, and that by muonic hydrogen spectroscopy. This discrepancy remains unresolved and is a topic of ongoing research in the world. We are going to determine the proton radius by low-energy electron scattering at ELPH, Tohoku University. The proton radius is defined as a derivative of the charge form factor at the momentum transfer squared zero. Therefore, we are going to measure the scattering cross section under the lowest-ever momentum transfer squared using the low-energy (~60 MeV) electron beam. Since the change in the charge form factor at momentum transfer measured in this experiment is only around 2 %, the cross section must be measured with an accuracy at 0.1%. We are constructing a high-resolution dipole spectrometer. In this talk, I will discuss the design of the spectrometer and the evaluation of the background due to multiple scattering effect of low energy scattered electrons. |
Thursday, October 25, 2018 10:00AM - 10:15AM |
DM.00005: Parallel read-out extension of the VME DAQ system Hidetada Baba The VME bus is a legacy DAQ front-end system in nuclear physics experiments. Since a read-out controller takes data from VME ADC/TDC modules in order, the read-out time depends on the size of data. When the number of ADC/TDC modules becomes large, the DAQ dead-time will also be large. To avoid this sort of performance limitations of the legacy system, some newly developed front-end systems directly output data to Ethernet. In RIKEN, we have developed the MOCO board to speed up the VME system. MOCO is a tiny VME controller which can be attached to the VME module without the VME bus. Since functions of VME controller is implemented on FPGA, the data read-out speed is very fast. However, there are some problems on stability, usability an electrical safety. Here, we developed a new backplane and a master read-out controller for MOCO to build more robust system. MOCO reads data from each VME module, and data is forwarded to the master controller through the new backplane. The master controller combines data from multiple MOCOs and send data to Ethernet. The new backplane can be installed on a standard VME power supply and chassis. In this contribution, details of the system and some performance measurements will be shown. |
Thursday, October 25, 2018 10:15AM - 10:30AM |
DM.00006: Fabrication and Characterization of MiniPPC Germanium Detectors Christopher Haufe, William Baker, H.R. Harris, Dongming Mei, David C Radford, Benjamin E Shanks, John F Wilkerson P-type point contact (PPC) germanium detectors are a preferred choice for several rare event searches. They have the advantage of superb energy resolution and excellent pulse shape discrimination capabilities. A number of groups are working to understand and improve the properties of PPC detectors. Such studies can be limited by either cost or availability of suitable detectors. We are working to design and fabricate smaller PPC Ge detectors as a cost-effective solution to this problem. These “miniPPC” detectors can be used to efficiently study charge trapping, temperature dependence, or electronic response within specific environments. Additionally, optimization of the miniPPC fabrication process may produce a scalable technique for producing cost-effective full-size PPC detectors. Collaborators within the PIRE-GEMADARC collaboration are working together to optimize the fabrication and characterization of these detectors. Simulations of miniPPC type designs have been performed using signal generation software “siggen” to determine the properties of these smaller detectors, and these results are presented here. |
Thursday, October 25, 2018 10:30AM - 10:45AM |
DM.00007: Ultralow-Radon Environment for the Installation of the CUORE 0&[nu]ββ Decay Detector Alexey Drobizhev CUORE—the Cryogenic Underground Observatory for Rare Events—is an experiment searching for the neutrinoless double-beta (0νββ) decay of 130Te with an array of 988 TeO2 crystals operated as bolometers at ~10 mK in a large dilution refrigerator. To achieve our target 130Te 0νββ decay half-life sensitivity of 9×1025 y with 5 y of live time, we seek to minimize backgrounds. To avoid the recontamination of the detector via exposure to radon gas during its installation in the cryostat, we perform all operations inside a dedicated cleanroom environment with a controlled ultralow-radon atmosphere. In this talk, I discuss the design and performance of the CUORE Radon Abatement System and cleanroom, as well as real time radon level monitoring. |
Thursday, October 25, 2018 10:45AM - 11:00AM |
DM.00008: Development of cryogenic optical-photon detectors with Ir/Pt-based transition edge sensors for CUPID V Singh, G Benato, C L Chang, J Ding, A Drobizhev, B K Fujikawa, R Hennings-Yeomans, G Karapetrov, Y G Kolomensky, L Marini, V Novosad, J Pearson, T Polakovic, B E L Schmidt, B J Sheff, S Wagaarachchi, G Wang, B C Welliver, V G Yefremenko CUPID, a natural successor to the CUORE experiment, is a proposed, future tonne-scale bolometric neutrinoless double beta (0νββ) decay experiment, which will attempt to extend the search of lepton number violation in the so-called inverted hierarchy region of the neutrino mass. However, in order to achieve its goal, CUPID will need to introduce new detection strategies with lower background components and enhanced target masses. A way forward is to develop detectors that will use a scintillating (or Cherenkov light-emitting) crystal and readout the phonon and light signal simultaneously, allowing us to do an event-by-event discrimination, thereby, enhancing the ability to reject background. I will talk about the ongoing R&D efforts at ANL/LBNL/UCB towards developing sensitive optical-photon detectors that can measure tiny amounts of light from the target mass. I will present the initial results from the characterization of these detectors and its performance in terms of energy and timing resolution. The detectors use a novel Iridium/Platinum -bilayer superconducting transition-edge-sensor (TES) that can be operated at temperatures below ~40 mK. To the best knowledge of the authors, this is the first reported study of an Ir/Pt-based TES device operating below ~40 mK. |
Thursday, October 25, 2018 11:00AM - 11:15AM |
DM.00009: Measurements of Light Emissions in TeO2 Crystals Roger Guo Huang, Giovanni Benato, Javier Caravaca, Yury G Kolomensky, Benjamin J Land, Gabriel D Orebi Gann, Benjamin Schmidt CUPID (CUORE Upgrade with Particle ID) is a next-generation bolometric experiment that will search for 0νββ decay with enhanced sensitivity through the ability to distinguish between 0νββ events and α backgrounds by detecting light emissions. To achieve this, it is important to characterize the amount of Cherenkov radiation that we can expect to detect, as well as any other luminescence that particles may cause in the detector material. The CHErenkov/Scintillation Separation setup (CHESS) is suitable for targets with small expected light yields, has the ability to detect light with high time resolution, and is sensitive to the directionality of light escaping the target material. We use this setup to measure and quantify the amount of Cherenkov and scintillation-like light emitted in TeO2 crystals, one of the primary candidate materials for the detector mass of CUPID. |
Thursday, October 25, 2018 11:15AM - 11:30AM |
DM.00010: GEM Detectors for DarkLight Phase 1C Sahara Jesmin Mohammed Prem Nazeer The DarkLight experiment has been proposed to search for a heavy photon A′ in the mass range of 10-100 MeV/c2 produced in electron scattering. Inspired by the recent discovery (Krasznahorkay, A. J. et al., 2016) of an anomaly in the emission of di-leptons from excited Be8, interpreted as evidence for a fifth force carrier with a mass of 17 MeV/c2, DarkLight Phase 1C will be focused on a dedicated search for a force carrier in the invariant mass region around 17 MeV/c2. The experiment aims to measure the process e-Z → (e-Z) e-e+ with a Tantalum target, by detecting a charged lepton pair in the final state. If the lepton pair originates from the decay of a hypothetical neutral force particle, a peak structure in the invariant mass spectrum is expected. For Phase 1C a setup of two magnetic spectrometers is favored to detect the lepton pair with an invariant mass near 17 MeV/c2. The spectrometers will be instrumented with customized GEM detectors for tracking. A novel GEM construction technique is used where all layers are stretched and assembled mechanically within a double frame. The preparation of GEM detector construction for the DarkLight Phase 1C experiment will be discussed. |
Thursday, October 25, 2018 11:30AM - 11:45AM |
DM.00011: Analysis of Sources of Dark Noise from Quartz PMTs in JLab Hall B CLAS12 HTCC Isabella Illari, William B Phelps The High Threshold Cherenkov Counter (HTCC) at Thomas Jefferson National Accelerator Facility (JLab) in experimental Hall B is one of the detector systems of the CLAS12 spectrometer used to generate fast trigger signal in electron experiments. The CLAS12 HTCC has 48 channels with 5” PMTs with quartz faceplate to detect Cherenkov light. Our plans are to re-calibrate and study overall performance of the PMTs, to replace them as needed, and to run some tests to find ways to reduce the dark noise in the HTCC channels. Several potential sources of the noise could be the presence of helium, the features of the power supply, or temperature-dependence of the components. It has been observed after-pulses in some PMTs while re-calibrating. We suspect that the culprit could be helium gas in the PMTs. The HTCC is mounted between a superconducting Central Solenoid and a superconducting Torus magnets. Helium in the experimental hall could be from small leaks, as well as from magnet quenches or their tests. This talk is a culmination of our efforts in both identifying and reducing the dark noise in the HTCC channels. |
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