Bulletin of the American Physical Society
2020 Fall Meeting of the APS Division of Nuclear Physics
Volume 65, Number 12
Thursday–Sunday, October 29–November 1 2020; Time Zone: Central Time, USA
Session FN: Instrumentation: Tracking Detectors |
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Chair: Nathan Grau, Augustana |
Friday, October 30, 2020 2:00PM - 2:12PM |
FN.00001: sPHENIX MVTX Test Beam Data Analysis Sitong Peng sPHENIX is a next generation high speed multipurpose detector focused on jet, Upsilon and open heavy favor programs. MVTX is a fast MAPS-based vertex detector designed for precise primary and secondary vertex measurements. Our group focuses on the MVTX detector simulation and track reconstruction using the sPHENIX software. We have been tuning the MVTX MC cluster size distributions using the 2019 Test Beam Data with 120GeV proton beam. A threshold of deposited energy on pixels needs to be applied to match the simulated cluster distributions to the Test Beam Data. Charge diffusion will also affect the energy deposit, ranging from effective minimal R to maximal R. We divide a track’s total pathlength in sensor into N segments, then calculate the overlapping area of circle in pixels to distribute energy deposition in the corresponding segment, and sum up all segments to get the total energy deposit in each pixel. We have matched the cluster size distributions in simulation to the ones from TB data, and also compared the simulation results with the TB data taken with several different incident angles, up to 40-degree. [Preview Abstract] |
Friday, October 30, 2020 2:12PM - 2:24PM |
FN.00002: Prospects of heavy flavour physics with sPHENIX MAPS based vertex detector Yasser Corrales Morales The sPHENIX detector will measure a suite of unique heavy flavour observables in heavy-ion collisions with unprecedented statistics and kinematic reach at the Relativistic Heavy Ion Collider (RHIC). A three-layer of the latest generation of Monolithic-Active-Pixel-Sensor (MAPS) based vertex detector (MVTX), will serve as the innermost tracking system of the sPHENIX experiment. The MVTX will provide a precise determination of the impact parameter of tracks relative to the collision vertex in high multiplicity heavy-ion collisions. Its very fine 27 $\mu$m x 29 $\mu$m pixels and low integration time ($< 10$ $\mu$s), which limits the event pile-up, allow us to identify B-decay secondary vertices and B-jets with high efficiency and high purity in heavy-ion collisions at the high luminosity RHIC environment. These new capabilities will enable precision measurements of open heavy flavor observables, covering an unexplored kinematic regime at RHIC. In this presentation, the open heavy flavor physics program at sPHENIX and the MVTX detector current status R\&D will be discussed. [Preview Abstract] |
Friday, October 30, 2020 2:24PM - 2:36PM |
FN.00003: Status of the sPHENIX TPC Henry Klest, Thomas Hemmick, Klaus Dehmelt, Prakhar Garg, Ross Corliss The sPHENIX detector is being constructed at the Relativistic Heavy Ion Collider for precision study of jet, quarkonia, and heavy flavor observables. sPHENIX is scheduled to begin data taking in 2023. The central tracking detector will be a compact time projection chamber spanning from 20 cm to 78 cm in radius and pseudorapidities less than 1.1. The TPC will utilize a quadruple-gas electron multiplier (GEM) gain stage and an optimized Ne:CF4 gas mixture. The highlights, test beam results, and current construction status of the TPC will be discussed. [Preview Abstract] |
Friday, October 30, 2020 2:36PM - 2:48PM |
FN.00004: Laser Test Stand for Silicon Detectors Andres Aguilar, Xu Sun, Zhenyu Ye To achieve a better precision in the position resolution to characterze responses of silicon detectors to high-energy particles, a laser test stand was designed and constructed. The infrared laser ($\lambda=1060$ nm) with a focused spot of 25 microns in diameter mimics high-energy particles to generates signals in Silicon detectors under test. The injection point of the laser on the Silicon sensors is controlled by a set of precision motors, allowing for precise movement at minimum of 3 micron steps in three dimensions. This talk will discuss the design and operation of the laser test stand, as well as results obtained for prototype modules of STAR Foward Silicon Tracker. [Preview Abstract] |
Friday, October 30, 2020 2:48PM - 3:00PM |
FN.00005: The Straw Tube Tracker for the MUSE Experiment Dan Cohen The MUon Proton Scattering Experiment (MUSE) at the Paul Scherrer Institute will measure the muon-proton and electron-proton elastic cross sections in the same experiment. The proton form factors will be determined from these data, and the proton radius will be extracted from the form factors. The Hebrew University together with Temple University is leading the effort to design, build, and operate the scattered particle Straw Tube Tracker detector (STT). The STT determines, in conjunction with beam GEM chambers, the precise scattering angle and interaction vertex of scattered beam particles, needed to determine the cross sections. I will describe the specifications for the STT, detail how they were achieved in the design, and describe the construction and QA processes. [Preview Abstract] |
Friday, October 30, 2020 3:00PM - 3:12PM |
FN.00006: Particle Identification Trigger for MUSE Shraddha Dogra The Muon proton Scattering Experiment (MUSE) uses a mixed beam of electrons, muons and pions from the PiM1 beam line of the Paul Scherrer Institute (PSI) in Villigen, Switzerland. The experiment will simultaneously measure elastic scattering cross-sections of both electrons and muons, from a liquid hydrogen target, and will extract the charge radius of the proton. Comparison of scattering cross sections will provide data for the proton radius puzzle, and comparison of cross sections obtained with positive and negative polarity beams will determine two-photon exchange radiative corrections. Correct particle identification at the trigger level is required to obtain a data set that is mainly from electron and muon scattering, rather than a data set that is dominated by pion scattering. This is done using a particle identification trigger (PID). I will discuss recent developments and results related to the PID trigger along with other aspects of experiment triggering. [Preview Abstract] |
Friday, October 30, 2020 3:12PM - 3:24PM |
FN.00007: Measuring the $^{235}$U(n,f)/$^{6}$Li(n,t) cross section ratio in the NIFFTE fissionTPC Maria Anastasiou While nuclear data play an important role in nuclear physics applications, it has become important to have a better understanding and try to minimize their uncertainties. In particular, there is a need for precision neutron-induced fission cross section measurements on fissile nuclei. Neutron-induced fission cross sections are typically measured as ratios, with a well-known standard in the denominator. While the $^{235}$U(n,f) standard is well measured, some light particle reactions are also well-known and their use as reference can provide information to remove shared systematic uncertainties that are present in an actinide-only ratio. The NIFFTE collaboration's fission time projection chamber (fissionTPC) is a 2$\times$2$\pi$ charged particle tracker designed for measuring neutron-induced fission. Detailed 3D track reconstruction of the reaction products enables evaluation of systematic effects and corresponding uncertainties which are less directly accessible by other measurement techniques. This work focuses on the recent measurement of the $^{235}$U(n,f) using as a reference the standard $^{6}$Li(n,t) reaction. Preliminary data of the $^{235}$U(n,f)/$^{6}$Li(n,t) measurement deployed at the Los Alamos Neutron Science Center will be presented. [Preview Abstract] |
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