Bulletin of the American Physical Society
85th Annual Meeting of the APS Southeastern Section
Volume 63, Number 19
Thursday–Saturday, November 8–10, 2018; Holiday Inn at World’s Fair Park, Knoxville, Tennessee
Session D04: Instrumentation II |
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Chair: Steve Pain, Oak Ridge National Laboratory Room: Holiday Inn Knoxville Downtown Parlor |
Thursday, November 8, 2018 4:30PM - 4:42PM |
D04.00001: Gaseous Electron Multiplier upgrade of the ALICE Time Projection Chamber Andrew J Castro The Time Projection Chamber (TPC) currently used for ALICE (A Large Ion Collider Experiment at CERN) is a gaseous tracking detector used to study both proton-proton and heavy-ion collisions at the Large Hadron Collider (LHC). In order to accommodate the higher luminosity collisions planned for the LHC Run-3 starting in 2021, the ALICE-TPC will undergo a major upgrade during the next long LHC shutdown. The TPC is currently limited to a read out of 1000 Hz in minimum bias events due to the intrinsic dead time associated with back ion flow in the multi wire proportional chambers (MWPC) in the TPC. The TPC upgrade will handle the increase in event readout to 50 kHz for heavy-ion minimum bias triggered events expected with the Run-3 luminosity by exchanging the MWPCs with a stack of four Gaseous Electron Multiplier (GEM) foils. The GEM layers will combine different hole pitches to reduce the dead time while maintaining the current spatial and energy resolution of the existing TPC. The talk will go over the physics motivation for the upgrade, the contribution from American institutes in the construction of Inner Read Out Chambers IROCs, and QA being performed at CERN. |
Thursday, November 8, 2018 4:42PM - 4:54PM |
D04.00002: Radiation Damage Studies on Optical Components of Particle Detectors Emrah Tiras, Kamuran Dilsiz The radiation exposure to particle detector components increases as collision energy and luminosity increase at the particle colliders. Each detector component needs to be a high radiation resistant to increase the longevity of the detectors and to provide robust and efficient results. We have tested several detector components such as wavelength shifting fibers, scintillators, and photomultiplier tubes up to an estimated level of dose with using 137Cs gamma ray source. We measure the radiation damage on the samples and study recovery properties over time. This presentation will give an overview of the optical testing setups and characterization results of the detector components after exposed to a certain level of radiation. |
Thursday, November 8, 2018 4:54PM - 5:06PM |
D04.00003: Development of a low-background structural active-veto scintillator for rare event physics Michael Febbraro, Gabriela Ibarra, Elena Sala, Bela Majorovits, Brennan Hackett, David Radford The polyester poly(ethylene 2,6-naphthalate) (PEN) is an attractive candidate as a low-background material for future rare event physics experiments. The polyester exhibits ideal mechanical, electrical, and scintillation properties permitting its use not only as an active shield but also a structural component with a yield strength higher than that of copper at cryogenic temperatures. Recent formulations have been developed which greatly improve optical clarity, reducing radio impurities, and aiding in production of complex geometries. In this presentation, we will provide an update on synthesis, characterization, and potential applications of PEN and PEN derivatives for rare event physics experiments. Examples will be provided on applications for future germanium-based ton-scale 0νββ experiments. |
Thursday, November 8, 2018 5:06PM - 5:18PM |
D04.00004: Fabrication of A High-efficiency Cosmic Ray Veto Detector for the Mu2e Experiment Daniel Mills, Craig Group The Mu2e experiment at Fermilab will search for the charged-lepton-flavor-violating process of coherent muon-to-electron conversion in the presence of a nucleus with a sensitivity four orders of magnitude beyond the current strongest limits. The experiment will have a single event sensitivity of about 3×10−17 while limiting the total background to about 0.5 events, significantly less than one event. One potential background is due to cosmic-ray muons producing an electron with signal characteristics within the Mu2e apparatus. The cosmic-ray-veto (CRV) system of the Mu2e experiment is tasked with vetoing such cosmic-ray-induced backgrounds with high efficiency while inducing low dead time operating in the high-intensity environment of the Mu2e experiment. The UVA HEP group has been leading the effort to design and prototype the CRV and has recently started the fabrication of this detector on site. Highlights of this effort, including detector production and progress, will be presented. |
Thursday, November 8, 2018 5:18PM - 5:30PM |
D04.00005: Performance Measurements of a High-Efficiency Cosmic Ray Veto Detector for the Mu2e Experiment Ben Barton, Steven Boi, Craig Group The Mu2e experiment at Fermilab will search for the charged lepton flavor violating process of coherent muon-to-electron conversion in the presence of a nucleus with a sensitivity four orders of magnitude beyond current limits. The experiment will have a single event sensitivity of about 3×10−17 while limiting the total background to about 0.5 events. One potential background is due to cosmic-ray muons producing an electron that is indistinguishable from signal within the Mu2e apparatus. The cosmic-ray-veto (CRV) system of the Mu2e experiment is tasked with vetoing cosmic-ray-induced backgrounds with high efficiency, without inducing significant dead time and while operating in a high-intensity environment. Efforts to measure the relative and absolute performance of CRV detector components will be discussed. |
Thursday, November 8, 2018 5:30PM - 5:42PM |
D04.00006: Studies of the Aging Properties of the Mu2e Cosmic Ray Veto System Peter Farris, Craig Group, Yuri Oksuzian, Steven Boi The Muon-to-Electron Conversion experiment (Mu2e) operates at extremely high sensitivities, requiring a means of reducing experimental background. The Cosmic Ray Veto system (CRV) is a particle detector that will surround the Mu2e apparatus to veto penetrating particles that present background. The CRV must have a detection efficiency of 99.99% throughout the expected three year lifetime of the Mu2e experiment. The CRV is comprised of extruded polystyrene scintillating strips and fiber which degrade over time, decreasing the efficiency of the CRV. Using a standard accelerated aging technique, several scintillator and fiber samples were heated to increase their rate of degradation. In addition, the natural aging of several scintillator samples was measured. The natural aging data was extrapolated using the accelerated aging results. The results of these studies and the impact of aging on the CRV will be presented. |
Thursday, November 8, 2018 5:42PM - 5:54PM |
D04.00007: Quality Control and Production Status of Large-area GEM Detectors for the CMS Muon Endcap Upgrade Mehdi Rahmani, Mehdi Rahmani Gas Electron Multiplier (GEM) detectors will be installed in the high-eta region of the CMS muon system by the year 2020. GEM detectors were selected for their superior spatial resolution and high-rate capability because the particle rate will increase in the high-eta region of CMS after a second long shut-down of the LHC. The use of GEM detectors in the endcaps will improve the CMS muon triggering, identification, and track reconstruction. Seven sites across the globe are engaged in an international effort to construct 161 detectors (81 long and 80 short) and to perform rigorous quality control (QC) testing. We will discuss the detector assembly and the QC tests in detail. Some of the most important quality controls concern: current leakage across GEM foils, chamber gas leakage, gas gain measurements, high voltage stability, and response uniformity. We will also present a comparison of effective gains of the detectors produced at various sites. An overall production summary will conclude our discussion. |
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