Bulletin of the American Physical Society
2021 Fall Meeting of the APS Division of Nuclear Physics
Volume 66, Number 8
Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time
Session LJ: Instrumentation VI |
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Chair: Simon Giraud, FRIB/NSCL Room: Tremont |
Wednesday, October 13, 2021 2:00PM - 2:12PM |
LJ.00001: Implementation and validation of a fully digital data acquisition system at the University of Kentucky Accelerator Laboratory Yongchi Xiao, Sally F Hicks, Erin E Peters, Steven W Yates, Sarah E Evans, Elizabeth A Chouinard, Benjamin P Crider, Jeffrey R Vanhoy For several decades, the University of Kentucky Accelerator Laboratory (UKAL) has utilized a CAMAC-based analog data acquisition system that histograms the data in Ortec AD114 and AD4113 modules prior to writing to disk. In order to enable an enhanced set of analysis techniques that will enable a more thorough study of nuclei, the UKAL has begun development and implementation of a fully digital data data acquisition system utilizing CAEN V1730 and V1782 modules as well as the CAEN CoMPASS software. In addition to digitizing all detector signals, we have also undertaken digitization of time-of-flight spectra directly from time differences between the detector signals and the beam pulses that occur every 533 ns. The system further enables waveform capture, which utilize for offline pulse-shape discrimination and digital filtering. Current efforts to implement the system, the discussion of how the particular data acquisition needs of the UKAL have been met, and the validation of the digital system compared to the analog system will be presented. |
Wednesday, October 13, 2021 2:12PM - 2:24PM |
LJ.00002: Simulations of a hadron endcap Forward Calorimeter System at EIC Zhiwan Xu, Oleg Tsai, Jaroslav Adam, Elke-Caroline Aschenauer, Alexander Kiselev A preliminary design of hadron endcap Forward Calorimeter System (FCS) based on a binary configuration was proposed in the EIC Yellow Report. We modeled the Geant simulations of various electromagnetic and hadronic calorimeters to quantify and optimize the forward (1 < η < 3.5) calorimeter system in measurement of jet energy. In this study, we employed Geant4.10 based model to reproduce ZEUS detector beam test data following both prototypes of Pb/Sc and DU/Sc configuration. Differential cross-checks on energy resolution, mean deposited energy ratio for hardrons and electrons at both high and low incident energy provided a good validation on analysis code. We found the design of EIC Hadron Endcap Calorimeter configuration using W/ScFi as ECal and Fe/Sc as HCal with the best optimization under the constraints of materials and available space. Instrumental variations such as sampling fraction, dead layers, interaction length, mean deposite energy ratio and birks coefficience were investigated to optimize the performance of the model. The results indicated W/ScFi and Fe/Sc configurations to be an viable compact FCS design that meets the EIC requirements in the hadron forward direction. A full scale prototype is needed to validate the simulation results. |
Wednesday, October 13, 2021 2:24PM - 2:36PM |
LJ.00003: Gas Ring Imaging Cherenkov (GRINCH) Detector for the SuperBigBite Experiments Bradley Yale, Todd D Averett The SuperBigbite (SBS) program at Jefferson Lab will use a large acceptance 2-arm spectrometer to determine the neutron electromagnetic form factor ratio $G_E^n/G_M^n$ for $Q^2$ up to $13.5$ $(GeV/c)^2$, extracted using several polarimetry techniques across 3 approved experiments ($G_M^n$, $G_E^n$, and $G_E^n$-RP). This ratio is largely unexplored for the neutron at $Q^2 > 3.5$ $(GeV/c)^2$. Probing this region would shed light on the surprising result of the corresponding proton form factor ratio measured using recoil polarization, which appears to drop at higher $Q^2$ (diverging with the Rosenbluth result), as well as isolate the contributions from up/down valence quarks, which would have a profound impact on our understanding of nucleon structure. |
Wednesday, October 13, 2021 2:36PM - 2:48PM |
LJ.00004: The Liquid Hydrogen Target for TPEX Zhuoheng Yang, Ievgen Lavrukhin, Wolfgang B Lorenzon, Richard S Raymond The notable discrepancies between the Rosenbluth separation method and the polarization transfer technique in determining the proton form factor ratio is still not resolved. The two-photon exchange (TPE) contribution is the current best explanation in resolving this discrepancy. The three recent experiments (VEPP-3, CLAS and OLYMPUS), which have reported on direct measurements of TPE, show little evidence for large contributions of hard two-photon exchange up to Q2 = 2.5 (GeV/c)2. The Two-Photon Exchange experiment (TPEX) at DESY proposes to determine the hard two-photon contributions by measuring the ratio of positron-proton to electron-proton elastic scattering at beam energies of 2 and 3 GeV. This will extend the momentum transfer range up to Q2 = 4.7 (GeV/c)2, where the TPE effect is expected to be more significant. For this new experiment, we propose to build a liquid hydrogen target that will yield a luminosity about a factor of 200 times higher than that of the OLYMPUS experiment. This higher luminosity will greatly shorten the run time needed at 2 GeV and help to make up for the lower cross section at 3 GeV beam energies. In this presentation, the latest updates on the requirements, technical design and implementation of the liquid hydrogen target for TPEX will be presented and discussed. |
Wednesday, October 13, 2021 2:48PM - 3:00PM |
LJ.00005: Measuring Pair-Creation Angular Distributions with a Time Projection Chamber; Studies of the X17 Boson Resonance Tan Ahn, Wolfgang Mittig, Yassid Ayyad, Maxime Brodeur, Daniel Bazin, Manoel Couder, Paul L Gueye, Khachatur Manukyan, Jaspreet S Randhawa, Nathan Watwood The X17 boson has been proposed as an explanation for a resonance in the angular distributions of the electron and positron pair conversion from high-energy transitions in the 7Li(p,γ)8Be and 3H(p,γ)4He reactions. The confirmation of this resonance using other experimental setups is desired. A dedicated experiment is currently being planned to precisely measure the pair conversion electrons and positrons using the Prototype Active-Target Time-Projection Chamber (PAT-TPC). The e+/- tracks from the transition of interest will be detected using the PAT-TPC that has been fitted with a 0.16 T solenoid magnet to allow for the bending and detection of the electron and positron tracks within the TPC. This technique will allow for the unambiguous identification of a pair conversion event and reduce the level of possible background contamination. The experimental setup and current development will be presented. |
Wednesday, October 13, 2021 3:00PM - 3:12PM |
LJ.00006: Geant4 study of the prototype AT-TPC experiment searching for the X17 boson resonance Paul L Gueye, Tianxudong Tang, Wolfgang Mittig An experiment was conducted at the tandem facility of Notre Dame using the prototype Active-Target Time-Projection Chamber (pAT-TPC) to search for the X17 resonance via the 7Li(p,g)8Be reaction. The angular distribution of the electron and positron pair from the g conversion was chosen to identify the possible boson resonance. A Geant4 Monte Carlo simulation is being developed to describe the experimental setup, understand the background and provide information on the efficiency and resolution of the system. Preliminary results from the simulation and data analysis will be presented and discussed. |
Wednesday, October 13, 2021 3:12PM - 3:24PM |
LJ.00007: Particle identification in multi-detector arrays using machine learning Bryan M Harvey, Mike Youngs, Sherry J Yennello Particle identification (PID) is a crucial component to a wide variety of nuclear physics analyses and is |
Wednesday, October 13, 2021 3:24PM - 3:36PM |
LJ.00008: Abstract Withdrawn
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Wednesday, October 13, 2021 3:36PM - 3:48PM |
LJ.00009: Abstract Withdrawn
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Wednesday, October 13, 2021 3:48PM - 4:00PM |
LJ.00010: Electron Beam Polarimetry for the CREX Experiment Donald C Jones The CREX experiment in Hall A at Jefferson Lab recently measured the neutron radius of Ca-48. This was accomplished via measurement of the parity violating (PV) scattering asymmetry which is mainly sensitive to the neutron distribution. The measured asymmetry scales linearly with the beam polarization which is typically a key systematic error for PV experiments like CREX. The beam polarization was provided by a combination of Compton and Møller polarimeters. I will show the final results from the two polarimeters for CREX and discuss key insights and improvements. I will also talk about issues that came to light that will need to be addressed for the next generation of parity experiments. |
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