Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session Q16: Instrumentation |
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Sponsoring Units: DNP Chair: Igal Jaegle, Jefferson Lab Room: Marquette VII - 2nd Floor |
Monday, April 17, 2023 3:45PM - 3:57PM |
Q16.00001: Status of the Multi-layer Active target for MoNA Experiment (MAME) Paul L Gueye, Nicholas Mendez, Thomas Redpath, Marco Cortesi, Thomas J Baumann, Iulia Maria Harca, Hannah Erington The MoNA Collaboration uses the invariant mass technique to study neutron-unbound systems at the Facility for Rare Isotope Beams (FRIB) which started operation on May 10, 2022. The production cross section for such systems is of order of 0.1-1.0 mb which led this Collaboration to develop a silicon-beryllium based active segmented target to increase its yield and resolution of the reconstructed decay energy. However, the 140 mm thick silicon detectors have limitations from current saturation and radiation damage, typical for these solid-state devices, thus preventing to benefit fully from the high FRIB beam rates. Investigation of a gas-filled time projection chamber coupled to a gaseous electron multiplier (GEM) is under development to address this issue. This Multi-layer Active Target for MoNA Experiment (MAME) is expected to enable missing mass capability by tracking all the reaction products (neutrons and fragments from the decay of the unbound isotopes as well as recoils) and use the scalable readout system (SRS) data acquisition system for the readout of its high channel density. The status of this target will be reviewed and discussed. |
Monday, April 17, 2023 3:57PM - 4:09PM Withdrawn |
Q16.00002: Reducing the background levels of GEM detectors in high rate environments of SBS experiments at JLab Minh N Dao, Xinzhan Bai, Nilanga K Liyanage, Huong Nguyen, Bhasitha Thuthimal Dharmasena Purijjala Lindagawa Gedara, Vimukthi P Haththotuwa Gamage The Gas Electron Multiplier (GEM) detectors built at UVa are used for both front and rear tracking systems for SBS experiments at JLab. These detectors meet all critical requirements of the SBS program, including being able to handle rates as high as 500 kHz/cm2, and providing an excellent spatial resolution of 70 µm. However, a higher than predicted background levels that resulted from the intense low energy photon environment in the SBS experiments led to reduced efficiency and increased difficulty in GEM detector tracking. Our research focuses on reducing the background hits created in the GEM detector due to radiation interaction with the chamber components. To achieve this, a Geant4 simulation of a 10cm x 10cm GEM module has been developed to optimize the configuration of the cathode foil and the top GEM foil by varying their material and thickness to lower the effects of high background rates. Different prototype 10cm x 10cm GEM modules are constructed with various configurations of cathode foils and top GEM foils. Data is taken while the prototypes are exposed to an X-ray beam in the detector lab at UVa to validate the simulated results. Simulation results for the different configurations compared to experimental data will be presented. |
Monday, April 17, 2023 4:09PM - 4:21PM |
Q16.00003: Design and fabrication of the GEM detector for MOLLER experiment Bhasitha Thuthimal Dharmasena Purijjala Lindagawa Gedara, Nilanga K Liyanage, Huong Nguyen, Vimukthi H Gamage, Minh Dao The proposed MOLLER experiment at JLab will be measuring the parity violating asymmetry of longitudinally polarized electrons off unpolarized electrons. This measurement is aimed to expand the sensitivity to discover new physics beyond the standard model. Gas Electron Multiplier(GEM) detectors will be used in this experiment for spectrometer calibration and background measurements. The design and fabrication of a fully functional prototype GEM detector module were successfully completed at the University of Virginia in December. The prototype module was able to fulfill the mechanical stability and performance requirements during and after the fabrication process. The module was tested for low environments with cosmic particles, and will be tested for high environments with X-ray. The test results and observations of the prototype will be used in making adjustments to the detector module design, before starting the production of 32 GEM detector modules needed for the experiment. The steps of designing and fabrication of the detector prototype, and the results of the performance tests will be presented. |
Monday, April 17, 2023 4:21PM - 4:33PM |
Q16.00004: MOLLER Gem Tracker Construction brynna Moran The MOLLER experiment, which is set to start its run at Jefferson Labs in 2025, aims to use the measurement of parity-violating asymmetry to measure the weak mixing angle for a low energy at a precision of <1 part per billion. This precision will improve on the results of the SLAC E158 Apv measurement and potentially give insight to physics beyond the Standard Model. One way this project plans to achieve this precision is using 4 planes of Gas Electron Multiplier Trackers to track individual particles during the calibration process. These detectors are comprised of 3 layers of GEM foils separated by thin frames with continuous gas flow in-between the foils, and a 4th layer of a 2D readout board. In this presentation, I will discuss the main motivations for the GEM trackers and present on the construction and testing of these GEM Modules at Stony Brook University and report on the outgoing work and future plans. |
Monday, April 17, 2023 4:33PM - 4:45PM |
Q16.00005: Readout, commissioning and optimization of GEM Detector prototype for MOLLER experiment Vimukthi Haththotuwa Gamage, Bhasitha Thuthimal Dharmasena Purijjala Lindagawa Gedara, Xinzhan Bai, Huong Nguyen, Minh Dao, Nilanga K Liyanage The Measurement of a Lepton-Lepton Electroweak Reaction (MOLLER) experiment proposes to measure the parity-violating asymmetry in electron-electron scattering. Experiment will be carried out at Jefferson Laboratory with the upgraded 12GeV electron beam by rapidly flipping the longitudinal polarization of the electrons. Gas Electron Multiplier Detectors will be used to measure the background of the experiment. A prototype GEM detector for MOLLER was designed and fabricated at UVa. In December 2022 this detector was commissioned and tested using APV-25 chip based Scalable Readout System (SRS) readout at the detector development laboratory at UVa. Prototype operation was very stable holding the required high voltage for extended periods of time. Initial high pedestal noise read by the SRS readout was improved significantly after slight modifications to the detector groundings. Cosmic data taken confirms good performance of the detector under a low rate environment. Prototype will be exposed to high intensity x-rays to confirm the performance under a high rate environment. Results from cosmic and x-ray testing will be presented. These results will be important in moving on to the manufacturing stage of MOLLER GEMs, and for the future detector development in general. |
Monday, April 17, 2023 4:45PM - 4:57PM |
Q16.00006: Deconvolution of the measured asymmetry at the MOLLER Experiment Zuhal Seyma Demiroglu The MOLLER (Measurement Of a Lepton-Lepton Electroweak Reaction) experiment aims to measure the parity-violating asymmetry APV in the scattering of longitudinally polarized electrons off unpolarized electrons with an uncertainty of 0.8 ppb. This measurement would directly determine the weak mixing angle at low Q2 with the best precision that matches Z-pole measurements. Such a determination requires high statistics, meaning a high detector segmentation and integration running mode. The detector segmentation will help to disentangle the Moller asymmetry from different background processes. This talk will overview the deconvolution analysis to extract the asymmetry of the Møller scattered electrons from the background processes. |
Monday, April 17, 2023 4:57PM - 5:09PM Withdrawn |
Q16.00007: GADGET II TPC for decay spectroscopy studies at FRIB Ruchi Mahajan, T. Wheeler, C. Wrede, E. Pollacco, H. Alvarez Pol, A. Andalib, Y. Ayyad, Daniel Bazin, Tamas A Budner, M. Friedman, A. Jaros, David Perez-Loureiro, L.J. Sun, Jason Surbrook The calorimetric Proton Detector of the GAseous Detector with GErmanium Tagging (GADGET) system has been upgraded to operate as a Time Projection Chamber (TPC) to detect low-energy, β-delayed single- and multi-particle emission of interest to astrophysics. The upgrade, known as GADGET II, uses micro pattern gaseous amplifier detector technology and is surrounded by an array of high-purity germanium detectors for efficient high-resolution detection of γ-rays. A new high-granularity MICROMEGAS (MM) board with 1024 pads and high density Generic Electronics for TPCs data acquisition system have been installed. This TPC is among the first generation of resistive MM detectors in low-energy nuclear physics and has been tested using a 228Th alpha source and cosmic-ray muons. In addition, decay events in the TPC have been simulated by adapting the ATTPCROOTv2 data analysis framework. A novel method of using 2D convolutional neural networks for event classification with GADGET II is also introduced. In November 2022, GADGET II was successfully used for in-beam measurements to investigate the nuclear physics of Type I X-ray bursts. |
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