Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session S12: Instrumentation IIRecordings Available
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Sponsoring Units: DNP Chair: Fred Wietfeldt, Tulane University Room: Shubert |
Monday, April 11, 2022 1:30PM - 1:42PM |
S12.00001: In-Beam Performance of the Super BigBite Spectrometer Hadron Calorimeter Scott K Barcus, Sebastian Seeds The design and in-beam performance of a newly commissioned segmented sampling hadron calorimeter, HCAL-J, operating in Jefferson Laboratory's experimental Hall A will be presented. HCAL-J was designed to measure the energy of several GeV protons and neutrons. It is composed of 288 individual calorimeter modules measuring 15cmx15cmx1m and weighs approximately 40 tons total. Each module consists of 40 layers of iron, which cause the hadrons to shower, alternating with 40 layers of scintillator, which sample the energy. HCAL-J took its first electron beam data as part of the Super BigBite Spectrometer (SBS) nucleon form factor experiments during fall 2021 and winter 2022. The first of these experiments, GMn, measured the magnetic form factor of the neutron with HCAL-J detecting hadrons quasi-elastically scattered from liquid deuterium in coincidence with electrons measured by the BigBite Spectrometer. HCAL-J's performance in timing resolution, position resolution, energy resolution, and detection efficiencies during this initial run period will be discussed. |
Monday, April 11, 2022 1:42PM - 1:54PM |
S12.00002: Early Results from Xenon Doping of a Two-Phase Argon Time Projection Chamber Ethan P Bernard, Nathaniel Bowden, Jingke Xu, Eli Mizrachi, Igor Jovanovic, Sergey Pereverzev, Teal J Pershing, James W Kingston, Ryan J Smith, Charles Prior Two-phase liquid argon time projection chambers measure ionization signals by detecting S2 light produced by ionization electrons extracted from the liquid surface into argon gas under a strong electric field. This 128 nm light excites fluorescent wavelength-shifting coatings, which emit at longer wavelengths that are sensed by SiPMs or photomultipliers. The doping of argon gas with small (tens of ppm) quantities of xenon shifts the electroluminescence light to 147 nm, which can be sensed directly by recently developed SiPMs. This improves both the energy and time resolution of ionization signals; this is especially important for detecting the low-energy nuclear recoils of CEnNS and WIMP dark matter events. We describe early measurements of the ionization response of the S2 signal channel as a function of increasing xenon concentration in the electroluminescence gap above a xenon-doped argon mixture. We also discuss prediction and measurement (by RGA-instrumented sampling) of the Henry’s law constant that governs partition of xenon between gas and liquid phases. |
Monday, April 11, 2022 1:54PM - 2:06PM |
S12.00003: Optimizing the Particle Shielding for MOLLER Experiment Zuhal Seyma Demiroglu The anticipated radiation (both electromagnetic and hadronic) in the MOLLER experiment needs to be suppressed through shielding in order to protect sensitive electronics and personnel both inside Hall A and on the laboratory site of Thomas Jefferson National Accelerator Facility (JLab). Additionally, the electrons from secondary scattering can contribute an additional rate in the Moller detector system. The designed shielding around the target, upstream toroid, and collimator systems eliminates the largest amount of radiation. With this shielding, we aim to allow for timely access to the experimental hall and keep the radiation escaping from the hall and reaching the JLab area below the 10 mrem/year which is the limit mandated by the JLab. This talk will focus on the optimizing of particle shielding at different locations of the experiment. |
Monday, April 11, 2022 2:06PM - 2:18PM |
S12.00004: A direct sampling RF receiver for precise beam charge measurement Shujie Li, Aled V Cuda, Yuan Mei, John Arrington, Joseph H Camilleri, James Egelhoff, Yury G Kolomensky, Ernst P Sichtermann We have developed and tested a direct-sampling RF receiver capable of measuring the amplitude of a 1497MHz sinusoidal beam signal in 0.5ms integration windows to within 8 parts-per-million ($10^{-5}$) relative uncertainty. The receiver is intended for measuring signals from beam current monitoring cavities on the beamline of the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Laboratory. The beam signal strength, frequency, and integration window are consistent with the thus far unmet requirements of the upcoming MOLLER experiment to measure the beam charge for different helicity states. |
Monday, April 11, 2022 2:18PM - 2:30PM |
S12.00005: The Performance of the UVA made "Gas Electron Multiplier" (GEM) Detectors During the SBS-GMn Experiment Anuruddha D Rathnayake The very first experiment of the SBS (Super Bigbite Spectrometer) program in Hall-A of Jefferson Lab is the measurement of the magnetic form factor of the neutron (GMn) using the ratio method which involves the detection of both neutron tagged, d(e,e'n) and proton tagged, d(e,e'p), quasi-elastic scattering from a deuteron target. The experiment explores several kinematic points ranging from 3.5 GeV2/c2 to 13.5 GeV2/c2 with beam energies going up to 9.91 GeV. The concept of the Super BigBite Spectrometer, which provides a large solid angle acceptance and the capability to operate at high luminosity, relies heavily on Gas Electron Multiplier (GEM) detector-based particle trackers. In the GMn experiment, GEM trackers are used in the BigBite Spectrometer (the electron arm) which will determine the q-vector of the scattering reaction. This is the very first time GEM detectors are used in high background rates of about 100 KHz/cm2 in Jefferson lab. The parameters such as detector occupancy, gain/efficiency, and position resolution are of great interest to study. This talk will give a brief overview of the SBS - GMn experiment and elaborate more in detail about the performance of the UVA made GEM detectors during the experiment. |
Monday, April 11, 2022 2:30PM - 2:42PM |
S12.00006: Charged Particle Detection with Thermal Kinetic Inductance Detectors Elizabeth M Scott, Hans P Mumm, Jiansong Gao, Joel N Ullom, Jimmy Caylor, Colin A Heikes, Shannon M Hoogerheide, Maynard Dewey, Jeffrey S Nico, Michael R Vissers There has been longstanding interest in the potential of using precision nuclear physics experiments to improve limits in searches for physics Beyond the Standard Model (BSM). The traditional particle detection technology of many of these experiments, semiconductor or scintillation detectors, face fundamental performance limitations that greatly restrict the sensitivity achievable. A new detector paradigm for charged particle detection has the potential to dramatically improve sensitivity in searches for BSM physics. |
Monday, April 11, 2022 2:42PM - 2:54PM |
S12.00007: Design of a muon-veto system for the CUPID experiment Jorge Torres
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Monday, April 11, 2022 2:54PM - 3:06PM |
S12.00008: Experimental X - ray production cross section ratios for ion beam materials analysis using MeV Heavy Ion PIXE Masedi C Masekane The widespread adoption of a heavy ion approach to Particle Induced X-ray Emission (PIXE) spectroscopy continues to remain attractive due to the inherently high sensitivity of the technique. This increased sensitivity comes as a result of relatively higher interaction cross sections compared to those induced by conventional light projectile ions, traditionally protons. Unfortunately, full implementation of Heavy Ion PIXE continues to be impeded by the unavailability of reliable ionization cross section data, fundamental to the quantitation of PIXE spectra. This also limits the adoption of a PIXE inclusive heavy ion induced Total Ion Beam Analysis (TIBA) approach to materials analyses, where synergies of multiple IBA techniques render a powerful tool capable of providing a consolidated description of material samples under analysis. The need for experimental cross section data for the validation of existing and developing new theoretical frameworks thus continues to exist. This presentation describes an empirical approach to the approximation of heavy ion induced X-ray production cross sections, through systematic parameterization of experimental proton – heavy ion cross section ratios. The cross section ratios have been calculated for select heavy ion projectiles in metallic thin films measured within the 0.2 MeV/u – 1.0 MeV/u ion velocity range. Measured cross sections are finally compared to approximations by the semi-empirical model developed and the conventional ECPSSR theory, where agreements and discrepancies are discussed in terms of the dominant ionization mechanisms. |
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