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 EJ: Instrumentation II |
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Chair: Nathan Frank, Augustana College Room: Tremont |
Tuesday, October 12, 2021 11:45AM - 11:57AM |
EJ.00001: The Trapezoid Filter as a Least Squares Template Fitter Christopher B Crawford Finite Impulse Response (FIR) filters offer a powerful, flexible approach to maximizing the sensitivity in digital spectroscopy. For example, the trapezoid filter [1] removes the exponential background from a tail pulse and integrates the decaying charge collected over time to account for ballistic deficit, yielding a robust pulse energy amid uncertainties in the arrival time. Higher order cusp filters can also subtract constant background and reduce the energy uncertainty by preferentially weighting samples closer to the rising edge of the pulse. In addition to these classical filters, the new algorithm for performing least squares fits to template waveforms [2] is also implemented as an FIR filter. Conversely, we show that any FIR filter can be interpreted as a least squares fit, and that the trapezoid filter aptly arises from a particularly simple fit to the exponential tail pulse which it analyzes so well. |
Tuesday, October 12, 2021 11:57AM - 12:09PM |
EJ.00002: nEXO charge tile characterization and simulation validation studies with the Stanford TPC Jacopo Dalmasson nEXO is a proposed tonne-scale experiment aiming to search for neutrinoless double-beta decay. The detector is based on a single-phase time projection chamber (TPC) filled with close to 5000kg of xenon enriched to 90% in the isotope 136. Particular attention is given to the development of the anode, consisting of charge collecting strips deposited in silica "tiles". In this configuration, along with the collected charge, the induction signal can be detected and studied, potentially leading to a precise energy reconstruction. The pulse shape of the inductive part of the signal contains information that may be used to enhance the discrimination between signal from background. A dedicated 14cm drift length TPC has been built to characterize a prototype tile in liquid xenon using 220Rn as a source. Latest results from this setup will be shown, including simultaneous light/charge detection and the study of charge pulse shape analysis. Comparisons with simulations will also be discussed. |
Tuesday, October 12, 2021 12:09PM - 12:21PM |
EJ.00003: Measurement of scintillation light quenching for protons in a selection of rare earth inorganic scintillators Tatiana N Espinoza, David G Walter, Kurtis D Bartlett, Andrew S Hoover, Brian A Larsen, Caleb D Roecker
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Tuesday, October 12, 2021 12:21PM - 12:33PM |
EJ.00004: 3D printing of scintillators for nuclear and particle physics experiments Michael T Febbraro, Paul Hausladen, Amy Elliott, James Bevins, Brian Frandsen Organic scintillators are one of the most widely used detection materials in nuclear and particle physics experiments. Their reliability, simplicity, and low-cost make them the material of choice for many applications. Modern additive manufacturing techniques open the possibility of 3D printing scintillators to obtain complex geometries which would be challenging for conventional production techniques. In this talk, I will present on the development of photocurable scintillating resins for 3D printing of plastic scintillators using SLA and DLP methods. These scintillators have been developed for a range of applications from neutrinoless double beta decay to neutron detection. Scintillator performance, geometries, and challenges and opportunities of using 3D printing will also be discussed. |
Tuesday, October 12, 2021 12:33PM - 12:45PM |
EJ.00005: Performance of a Charged Particle Detector System to Study Unbound Systems at FRIB Nathan H Frank, Thomas Baumann, Paul A Deyoung, Paul L Gueye, Anthony N Kuchera, Belen Monteagudo, Georgia Votta, Henry Webb, Xinyi Wang Detections of charged fragments and neutrons emitted from neutron-unbound systems are made more complicated by the possibility of coincidentally detecting the gamma rays emitted from long-lived excited states of the final charged fragment. A charged particle detector telescope system was specifically developed to enable detection of such charged particles, along with the emitted neutrons and gamma rays, in a compact arrangement. This system was used for the study of such a nuclear system, 13Be, in an experiment that was performed at the National Superconducting Cyclotron Laboratory on the campus of Michigan State University. The charged particles were identified after passing through one silicon position sensitive detector (140 μm thick) and a stack of silicon detectors (5 × 500 μm thick) for energy loss measurement with a CsI crystal (3 cm thick) to measure the total kinetic energy of the isotopes. The latter was equipped with a read out by a silicon pin diode. Neutrons passed through the detectors with minimal attenuation and were detected by the MoNA-LISA modular neutron array. The emitted gamma rays were measured in an almost 4p solid angle around the CsI crystal using the CAESAR detector. The charged particle detector signals were processed using a digital data acquisition system. This talk will discuss the current analysis of this Si-CsI telescope data. |
Tuesday, October 12, 2021 12:45PM - 12:57PM |
EJ.00006: Update on the Software and Simulation for the Super Bigbite Spectrometer (SBS) Eric Fuchey Super Bigbite Spectrometer (SBS) is a new set of common instruments currently being installed in Hall~A at Jefferson Lab. It consists of a large aperture magnet with a modular detector package combined together with another spectrometer (usually the BigBite spectrometer). The core physics program of SBS consists in the measurement of the nucleon form factors at large values of Q2, but also includes semi-inclusive DIS and tagged DIS. Such measurements have in common to require high luminosity, which, combined with the large solid angle and open geometry of the SBS apparatus, leads to particularly challenging experimental conditions (high trigger rates and large occupancies, especially in the GEM tracking detectors). |
Tuesday, October 12, 2021 12:57PM - 1:09PM |
EJ.00007: Abstract Withdrawn
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Tuesday, October 12, 2021 1:09PM - 1:21PM |
EJ.00008: Constructing the Pareto Front for the SECAR Recoil Mass Separator Kirby Hermansen, Ryan Roussel, Fernando Montes, Sara Ayoub Miskovich The SEparator for CApture Reactions (SECAR) is a next-generation recoil mass separator being commissioned at the Facility for Rare Isotope Beams (FRIB). SECAR uses 8 dipole magnets, 15 quadrupoles, and 2 Wien filters to make precise, direct measurements of astrophysically relevant nuclear reaction rates. With such a complex system, the code COSY Infinity is used to simulate the ion optics of SECAR for given magnet settings. Here, we use these simulations in conjunction with a multiobjective evolutionary algorithm based on decomposition (MOEA/D), to construct a phase space of the magnet parameters and the corresponding objective space. The objective space consists of several properties of the beam, evaluated at multiple points along the beamline. These include the mass resolution and the energy/angular acceptances of the separator. When evolved, the algorithm finds the full Pareto front of the SECAR optimization problem, giving a selection of non-dominated points which perform comparatively better than all other points in at least one objective value. The user can then select a point from the space that performs suitably across the objectives for their purpose. Evolving this algorithm over a large number of distinct iterations more completely maps the entire phase space. |
Tuesday, October 12, 2021 1:21PM - 1:33PM |
EJ.00009: Machine Learning in LabVIEW to target NMR signals Devin A Seay, Ishara P Fernando, Dustin Keller Constant current continuous wave Nuclear Magnetic Resonance (NMR) has been an essential tool for polarized target experiments in Nuclear and High-energy physics. Q-meter based phase-sensitive detection can provide accurate monitoring of the polarization over the course of a scattering experiment; however it can only function reliably within a very strict set of electronic operational parameters. In this talk, we present recent studies of improved signal to noise in polarization measurements as well as reliable measurements outside of the designated range of the Q-meter's operational parameters with the use of machine learning (ML). |
Tuesday, October 12, 2021 1:33PM - 1:45PM |
EJ.00010: Design and Operation of a Penning Ion Trap Source for the CHIP-TRAP Mass Spectrometer Madhawa V Horana Gamage, Nadeesha D Gamage, Ramesh Bhandari, Matthew Redshaw In this presentation, I will describe the design and operation of a Penning Ion Trap (PIT) source that we have developed at Central Michigan University (CMU). It is similar to in concept to a PIG source, but produces small bunches of ∼100s to 1000s of ions from minimal gas samples in short duration (∼1 μs) pulses. It is comprised of a cylindrical trap structure consisting of a ring and two end caps, inside a 0.55 T permanent neodymium ring magnet with a trap volume of about 0.8 cm3. Ions are produced by electron impact ionization of gas admitted into the trap via a precision leak valve using a ∼1 μA electron beam from a thermal emitter applied for typically 1 ms. Ions produced within the trapping region are automatically confined and stored for a period of typically 5 ms before being released from the trap by lowering the voltage on one of the end caps in about 250 ns. The PIT source is incorporated into the CMU High Precision Penning Trap (CHIP-TRAP) mass spectrometer that we are currently developing at CMU. CHIP-TRAP will be used to perform precise mass measurements on stable and long-lived radioactive isotopes, some of which will be supplied by the PIT source. |
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