Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session M07: Instrumentation: Particle Tracking |
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Chair: Andrew Ratkiewicz, Lawrence Livermore National Laboratory Room: Hilton Waikoloa Village Queens 6 |
Friday, December 1, 2023 2:00PM - 2:15PM |
M07.00001: Reducing the background levels of GEM detectors in high-rate environments due to low-energy photons Minh N Dao, Xinzhan Bai, Vimukthi H Gamage, Bhasitha Thuthimal Dharmasena Purijjala Lindagawa Gedara, Nilanga Liyanage, Huong Nguyen The Micro-Pattern Gas Detector group at the University of Virginia (MPGD-UVa) has successfully built various large area Gas Electron Multiplier (GEM) detectors for multiple experiments at JLab. These detectors are capable of meeting all critical requirements of the high luminosity Super Bigbite Spectrometer (SBS) experiments, handling rates as high as 500 kHz/cm², and providing an excellent spatial resolution of 70 µm. However, the high background levels caused by the intense low-energy photon environment in SBS resulted in reduced efficiency, increased difficulty in tracking, and a shorter lifespan of the GEM detectors. Our research focuses on reducing the background hits created in the GEM detector due to radiation interactions (such as the photoelectric effect, Compton scattering, and pair production) with the chamber's 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 materials to mitigate the effects of high background rates. Three different prototypes of 10cm x 10cm GEM modules have been constructed using cathode and top GEM foils with conductive layers made up of three different materials: Al, Cu, and Cr. Data is collected while the prototypes are exposed to a high-intensity X-ray beam in the MPGD-UVa lab to validate the simulated results. The findings from this study will be presented. |
Friday, December 1, 2023 2:15PM - 2:30PM |
M07.00002: High luminosity Gas Electron Multiplier (GEM) tracker for GEp-V experiment at Jefferson lab Vimukthi Haththotuwa Gamage The Super Bigbite Spectrometer (SBS) program at Jefferson Lab aims to measure the electromagnetic form factors of the nucleons. Flagship experiment of the program, GEp-V, focuses on measuring electric form factor of the proton (GEp) up to Q2 of 12 GeV2. SBS program significantly improves the figure of merit by over a factor of 50 compared to previous GEp measurements through the use of an open geometry large acceptance spectrometer for proton detection. However, the open nature of the spectrometer, with a direct line of sight from the target to the tracking detectors, creates an unprecedented high-rate background environment. SBS trackers consist of 16 large area GEM layers designed to handle high background rates. Nevertheless, high voltage supply scheme for GEMs requires optimization to operate under high leakage currents caused by high rates. Previous SBS experiments revealed that conventional voltage divider scheme fails to provide necessary voltages, resulting in decreased GEM efficiencies during experimental running. Consequently, high voltage supply scheme has been optimized and upgraded for GEp-V to ensure high efficiency at anticipated unprecedented luminosities. Presentation will include results comparing upgraded system operating in beam with simulations. These upgrades will be beneficial for future experiments such as the Solenoidal Large Intensity Device (SoLID). |
Friday, December 1, 2023 2:30PM - 2:45PM |
M07.00003: Development of a Novel Detector Concept: Pixel Projection Chamber (PPC) for operating at ultra high rates for Tagged Deep Inelastic Scattering (TDIS) program at JLab Jacob T McMurtry The high luminosity spectator tagging experimental program in Jefferson Lab Hall A will enable precision measurements of electron scattering off pion, kaon, and neutron targets. The program will focus on exploring the meson content of the nucleon, studying the structure functions of pions and kaons, and investigating Deeply Virtual Compton Scattering (DVCS) on the neutron. A crucial aspect of this experiment is the development of a detector capable of tracking low momentum recoil protons at high background rates. To address this challenge, we have designed the Pixel Projection Chamber (PPC), a wire amplification based device with wire spacing and plane separation as small as 1 mm. These wire planes will provide pixelized snapshots of a curving particle track in a solenoidal magnetic field. The PPC offers significant improvements in both hit and track occupancy, which are essential for the success of the experiments. We are creating a detailed CAD model of the detector as well as performing a Geant 4 simulation. Additionally, we will fabricate a proof-of-principle prototype in order to investigate the detectors stability, amplification, and gas uniformity. The results from these studies will be presented. |
Friday, December 1, 2023 2:45PM - 3:00PM |
M07.00004: sPHENIX Intermediate Silicon Tracker Genki Nukazuka, Yasuyuki Akiba, Joseph Bertaux, Raul Cecato, Kazuma Fujiki, Manami Fujiwara, Takashi Hachiya, Shoichi Hasegawa, Misaki Hata, Byungsik Hong, Jaein Hwang, Mai Kano, Tomoya Kato, Takahiro Kikuchi, Takashi Kondo, Chia-Ming Kuo, Rong-Shang Lu, Itaru Nakagawa, Rachid Nouicer, Robert Pisani, Cheng-Wei Shih, Maya Shimomura, Ryota Shishikura, Milan Stojanovic, Yuka Sugiyama, Wei-Che Tang, Hinako Tsujibata, Mai Watanabe, Wei Xie The sPNENIX collaboration completed the detector construction at the Relativistic Heavy Ion Collider in BNL, and the commissioning is ongoing to study the Quark-Gluon Plasma and cold-QCD. A detector complex consisting of the solenoid magnet, a hadron calorimeter, an electromagnetic calorimeter, a time projection chamber (TPC), a MAPS-based vertex detector (MVTX), and the intermediate silicon tracker (INTT). A tracking system formed by the three latter detectors enables us to measure the heavy flavor jets and identify the three upsilon states. The INTT contributes to high-precision tracking by detecting hit points between TPC and MVTX. Thanks to the great timing resolution, INTT can provide timing information of hits to eliminate pile-up events by misidentifying bunch-crossing. |
Friday, December 1, 2023 3:00PM - 3:15PM |
M07.00005: Simulation studies of Monolithic CMOS Si sensor with gain layer for timing measurements Shujiro Shindo A Large Ion Collider Experiment (ALICE) at CERN is an experiment to understand the properties of the quark-gluon plasma (QGP). The experiment will be upgraded from 2032 to 2035, and ALICE3 will begin in 2035 with new detectors. In ALICE3, the time of flight (TOF), which will be made of Monolithic CMOS silicon sensor, will be used. The goal is to achieve the timing resolution of 20ps. Simulation studies were performed using Garfield++ and the results will be shown in this presentation. |
Friday, December 1, 2023 3:15PM - 3:30PM |
M07.00006: Development of Thin Gap Triple-GEM Detectors for Precise Tracking with Large Acceptance Huong Nguyen, Xinzhan Bai, Minh N Dao, Nilanga Liyanage A number of large-area GEM detectors constructed by the Detector group at the University of Virginia for operation in various nuclear physics experiments at JLab have successfully met critical tracking requirements, demonstrating high efficiency and excellent spatial resolution of 70μm. However, achieving simultaneous high spatial resolution and efficiency for large-area gaseous detectors poses a new challenge for physics programs, such as the Electron-Ion Collider (EIC), which require precision tracking across a wide range of incident track angles. In this case, the spatial resolution of a gaseous detector for a track incident at a large angle significantly degrades as the distance a charged particle traverses in the ionization gas volume increases. Conversely, an ionization region that is too thin may not produce a sufficient number of primary electrons, resulting in reduced detection efficiency. To reduce the impact of the incident angle of the track on the spatial resolution and to maintain high efficiency as well as the stability of the triple-GEM detectors, we have built multiple Thin-Gap triple-GEM prototypes with a drift gap significantly thinner than 3mm gap in typical GEM detectors, and with various configurations of the cathode layer. The performance of prototypes was evaluated in beam studies using the Fermilab Test Beam Facility. A detailed study of the spatial resolution and tracking efficiency versus incident track angle for different drift gap thicknesses and cathode structures of our Thin-Gap triple-GEM prototypes will be presented. |
Friday, December 1, 2023 3:30PM - 3:45PM |
M07.00007: Development of compact MWPC detectors for TRINAT experiment JOZEF KLIMO, Dan G Melconian, John A Behr, Grigor Chubaryan, Brayden M Vargas-Calderon, Briana Diaz, Alexandre Gorelov, Victor Iacob, Brian Kootte, James McNeil To improve our beta asymmetry measurement using TRIUMF's neutral atom trap for beta decay (TRINAT), we are preparing for the next correlation measurement of polarized 37K at TRIUMF. One of our limiting systematics is the performance of our current β detectors, which are made up of 300 um-thick double-sided Si-strip (DSSSD) ΔE-detector backed by a BC408 plastic scintillator E-detector. We are upgrading these telescopes to reduce the effect related with Landau tail of ΔE β spectra, the backscattering, and the struggling in the DSSSD by replacing it with a multiwire proportional counter (MWPC). We will also replace the magnetic-field-sensitive PMT readout of the scintillator with Si photomultipliers (SiPMs). The same re-entrant flanges will be used to house the new β telescopes, which limits the size of the new detector design. This talk will describe the development of two compact, small-area, position-sensitive MWPC detectors for TRINAT, particularly the spin-polarized β+ decay experiment. The detectors will help to reconstruct momentum vector of β particles on event-by-event basis, with higher precision than DSSSD detectors. |
Friday, December 1, 2023 3:45PM - 4:00PM |
M07.00008: SREFT, a new TPC for neutron-induced fission and light charged-particle cross-section measurements Christopher J Prokop, Jaspreet S Randhawa The Spatially Resolved Fission Tracker (SREFT) is a time projection chamber under development at Los Alamos National Laboratory. SREFT is following the conclusion of successful operation of the Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) TPC, a decadal effort to precisely measure major actinide fission cross-section ratios. SREFT leverages much of that operational experience while making heavy use commercially available hardware to cost-effectively measure minor actinide neutron-induced fission and light charged-particle reaction cross sections (i.e n,a) for a variety of sponsors. In this talk I will discuss the various design aspects of SREFT, present our most recent commissioning data, and discuss planned measurements at the Los Alamos Neutron Science Center (LANSCE). |
Friday, December 1, 2023 4:00PM - 4:15PM |
M07.00009: SREFT-TPC: Simulations and analysis software Jaspreet S Randhawa, Christopher Prokop Spatially resolved fission tracker (SREFT) is a newly developed Time Projection Chamber (TPC) at Los Alamos National Laboratory, aimed to measure neutron-induced fission and neutron-induced charged particle reactions. TPC provides 3D-imaging of charged particles and allows event by event reconstruction of reaction vertex. A detailed simulation has been developed to understand the expected performance and to optimize the operating conditions for SREFT. To interpret the simulation results, analysis codes have been developed. I will discuss the SREFT simulations and performance of analysis codes on simulated as well as preliminary data. |
Friday, December 1, 2023 4:15PM - 4:30PM |
M07.00010: Optimizing the MoNA Sweeper ion-optical transfer matrix for enhanced energy and angular resolution Paul Gueye, Thomas Baumann, Thomas Redpath, Gabriella Mankovskii The decay energy of neutron unbound states can be reconstructed from measurements of the four-momenta of the decay products using an ion-optical matrix. This study focuses on the optimization of the ion-optical transfer matrix to improve the energy and angular resolution of the large gap Sweeper magnet system used by the MoNA Collaboration. The matrix allows to reconstruct (x, θx, y, θy) for each fragment from their positions on the two Cathode Readout Drift Chambers (CRDCs). The refinement of matrix elements allows for the improved reconstruction of particle trajectories, enabling more precise analysis and characterization of reaction products. The matrix calculations were validated through simulation studies; and tungsten mask runs were utilized to adjust the matrix elements based on patterns measured on the segmented target tetra lateral position silicon detectors (TLPSDs) and CRDCs. Results from this study will be presented and discussed. |
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