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 DJ: Instrumentation I |
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Chair: Ethan Cline, Stony Brook Room: Tremont |
Tuesday, October 12, 2021 9:30AM - 9:42AM |
DJ.00001: Reactive Tuning of Sheared Elliptical Solenoid for Precision Neutron Beam Experiments David Bowles Because of the neutron's neutrality, many fundamental symmetries experiments instead exploit its magnetic moment and use precise magnetic fields to manipulate neutron beams. One implementation requirement of experimental searches for beyond Standard Model sterile (mirror) neutron oscillations is a ~10G magnetic field, tunable to arbitrary directions, and maintaining a uniformity to ~2mG. To produce both uniform solenoidal and transverse magnetic fields we have implemented a symmetric design involving a series of three sheared elliptical solenoids layered and rotated by 2π/3 with respect to each other. I will present a mechanism by which three coils can be tuned not only to produce an arbitrary field in any direction, but also to actively compensate for small variations in background fields along the beam axis. These nonstandard wire geometries have been fully realized using 3D printing technology. |
Tuesday, October 12, 2021 9:42AM - 9:54AM |
DJ.00002: Study of Charge Transport in a SuperCDMS-style Ge Detector Fabricated From a USD-Grown Single Crystal at a Cryogenic Temperature Pramod Acharya, Matthew Fritts, Dongming Mei, Nicholas Mast, Vuk Mandic A designated experiment to understand the charge transport behavior in a SuperCDMS-style Ge detector made from a USD-grown crystal was performed at the University of Minnesota. The detector is patterned with four concentric charge channels on one side, and a bias electrode on the opposite side. Am-241 sources were used to observe the 59.54 keV peak in spectra from each channel. Since the majority of charge carriers were created near the surface of the detector, this study can be used to understand the charge transport, charge collection efficiency, charge trapping, and charge breakdown, as a function of bias voltage. We investigated the time-dependent charge amplification induced by holes at mK temperature. |
Tuesday, October 12, 2021 9:54AM - 10:06AM |
DJ.00003: Machine Learning Applications for the SBS Hadron Calorimeter Scott K Barcus The new HCAL-J is a segmented hadron calorimeter constructed to measure the energy of several GeV protons and neutrons. HCAL-J will be used this fall in the initial Super BitBite (SBS) collaboration series of experiments in Jefferson Lab's Hall A, beginning with the GMn experiment which will precisely measure the magnetic form factor of the neutron. HCAL-J is composed of 288 individual calorimeter modules measuring 15cmx15cmx1m. These modules consist of 40 layers of iron, which cause the hadrons to shower, alternating with 40 layers of scintillator, which sample the energy. HCAL-J has a time resolution of 0.5 ns, a position resolution as good as 3-4 cm, and detects protons and neutrons with near identical efficiency. This talk will address efforts to implement neural network based cluster finding algorithms and particle identification for HCAL-J, with the goal of reducing background signals during these experiments. Plans to implement these neural networks on FPGAs to be used as a real time experimental trigger for HCAL-J will also be discussed. If successful a neural network based trigger could select physics events over background more efficiently than traditional methods, collecting cleaner data samples and saving beam time. |
Tuesday, October 12, 2021 10:06AM - 10:18AM |
DJ.00004: Designing a Neutron Detector With Improved Position Resolution for the MoNA Collaboration Thomas Baumann The investigation of neutron-unbound states at the drip line using invariant mass spectroscopy depends critically on the measurement of the four-momentum vector of the emitted neutrons. Most current large-area neutron detectors rely on plastic scintillator bars with a pair of photo-multiplier tubes (PMTs) at the ends to deduce the position of the emitted light from a time difference measurement of the PMT signals. This results in a limited position resolution of the order of centimeters. A different option is to localize the light emission using discrete or position sensitive photo detectors. Arrays of SiPM detectors or photo-sensitive THGEMs could be utilized. In this study possible geometries for such an approach are investigated regarding their position resolution and light collection efficiencies. For this purpose Geant4 simulations are being performed and tests with protoype detectors are planned. |
Tuesday, October 12, 2021 10:18AM - 10:30AM |
DJ.00005: Design and Status of a Multi-Reflection Time-of-Flight Mass Separator for the CHIP-TRAP Penning Trap Mass Spectrometer at Central Michigan University Ramesh Bhandari, Madhawa H Gamage, Nadeesha D Gamage, Matthew Redshaw, Philip Snoad At Central Michigan University (CMU), we are developing the CMU High Precision Penning trap (CHIP-TRAP), with the aim of performing high-precision mass measurements on stable and long-lived radioactive isotopes. CHIP-TRAP utilizes a laser ablation source and a Penning ion trap source to produce ions from solid and gaseous samples, respectively. In either case, contaminant ions are produced along with the ions of interest. To increase efficiency and sensitivity to ions produced in small quantities, such as radioactive ions, contaminant ions must be removed before they reach the Penning trap. To this end, we are implementing a multi-reflection time-of-flight mass separator (MR-TOF-MS) between the ion sources and the Penning trap. Ions confined in the MR-TOF-MS are reflected between electrostatic mirror electrodes, increasing their effective path length and separating bunches of ions based on their m/q ratio. After they are released from the MR-TOF-MS, a Bradbury-Nielsen gate will pass only the ions of interest. In this presentation, I will show the assembly, fabrication, and simulations analysis to optimized electrode voltages of an MR-TOF-MS. The current status and the commissioning of the apparatus to the beamline of the CHIP-TRAP will also be presented. |
Tuesday, October 12, 2021 10:30AM - 10:42AM |
DJ.00006: A Cryogenic High-Voltage Multiplier for SNS nEDM Marie A Blatnik The nEDM@SNS’s experimental goal to measure the neutron’s electric dipole moment (nEDM) with a sensitivity on the order of 10-28 e cm requires an electric potential across the measurement cell of 650 kV in a sub-kelvin environment. A cryogenic, high-voltage multiplier based on Cavallo’s classic electrostatic induction machine is being developed to apply 650 kV to the nEDM measurement cells starting with an input voltage of 50 kV. A cryogenic test apparatus is being developed to test this design, including simulations, charging tests, and sparking control strategies. A non-contact voltage measurement device is also being designed and implemented. |
Tuesday, October 12, 2021 10:42AM - 10:54AM |
DJ.00007: Progress on the St. Benedict at the NSL Maxime Brodeur, Daniel P Burdette, Jason A Clark, Biying Liu, Patrick D O'Malley, Guy Savard, Adrian A Valverde, Marc A Yeck Nuclear beta decays provide a unique avenue for testing the electroweak part of the Standard Model through precision measurements. Physics beyond the Standard Model would manifest itself in these transitions through a variety of possible effects, including a non-unitarity of the Cabibbo-Kobayashi-Maskawa quark mixing matrix, scalar or tensor currents, and interactions involving right-handed neutrinos. These various effects can be probed for via measurements of the beta-neutrino angular correlation parameter in superallowed mixed beta decay transitions. To that end, the Superallowed Transition Beta-Neutrino Decay Ion Coincidence Trap (St. Benedict) is currently under construction at the University of Notre Dame Nuclear Science Laboratory. The status of St. Benedict will be presented. |
Tuesday, October 12, 2021 10:54AM - 11:06AM |
DJ.00008: Fast neutron response of C7LYC: simulation and experiment S. Saha, Partha Chowdhury, T. Brown, E. Doucet, M. Devlin, P.C. Bender, N. D'Olympia, N. Fotiades, J.A. Gomez, C.J. Lister, C. Morse, A.M. Rogers, G.L. Wilson New insights into the fast neutron response of 7Li-enriched C7LYC scintillators have been obtained through detailed GEANT4 simulations of (n,p) and (n,alpha) reactions on 35Cl, that are primarily responsible for the neutron response of C7LYC. The light output for a C7LYC detector was simulated and used to identify features of the different neutron reaction channels. The simulations were benchmarked against experimental data for inelastic neutron scattering data from a 12C target, obtained at the Los Alamos LANSCE facility, where a white neutron beam is generated by bombarding a thick W spallation target with 800 MeV pulsed protons. Fourteen 1"x1" C7LYC detectors were placed radially at a distance of 8" from the 12C scatterer. Incident neutron energies were extracted from their time-of-flight through a 20-m path from the spallation target to the 12C, with appropriate recoil corrections for the different detector angles, allowing a mapping of the response of C7LYC to mono-energetic neutrons. Resonances in the 35Cl(n, p) cross-section below 3 MeV neutron energy, recently measured through the detection of the outgoing proton [1], were directly observed in C7LYC with similar resolution as a function of incident neutron energy. |
Tuesday, October 12, 2021 11:06AM - 11:18AM |
DJ.00009: Using a segmented PMT as an implantation detector for decay studies Ian C Cox, Robert Grzywacz, Joseph Heideman, Thomas T King, Krzysztof Rykaczewski, Maninder Singh, Cory R Thornsberry, Rin Yokoyama Nuclear decay experiments at fragmentation facilities need a versatile implantation detector for measuring the position and energy of implantation events and their corresponding decay events. Conventional silicon detectors do not have a sufficient time resolution for measuring fast decays or neutron Time-of-Flight spectroscopy. A planned experiment to measure the super-allowed alpha decay chain of 108Xe to doubly-magic 100Sn would require a detector to be very fast, as the half-life of 104Te has previously been measured to have an upper limit of 20 ns [1]. Using a segmented Yttrium Orthosilicate (YSO) scintillator coupled to a multi-anode PMT [2] proves to be a good implant detector, with a fast scintillation response which can be used to measure these fast alpha half-lives, while a high light yield allows for precise measurements of decays for other fragmentation experiments, such as studying proton emission or the beta-delayed neutron spectroscopy. The YSO detector can be paired with LaBr3 gamma detectors for measuring excited states. Development of a segmented YSO detector designed for fragmentation experiments will be presented. |
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