Bulletin of the American Physical Society
APS April Meeting 2017
Volume 62, Number 1
Saturday–Tuesday, January 28–31, 2017; Washington, DC
Session U9: HL-LHC, Belle2, Future Colliders |
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Sponsoring Units: DPF Chair: Marcela Carena, FermiLab Room: Roosevelt 1 |
Monday, January 30, 2017 3:30PM - 3:42PM |
U9.00001: Simulation study of pixel detector charge digitization Fuyue Wang, Benjamin Nachman, Maurice Sciveres Reconstruction of tracks from nearly overlapping particles, called Tracking in Dense Environments (TIDE), is an increasingly important component of many physics analyses at the Large Hadron Collider as signatures involving highly boosted jets are investigated. TIDE makes use of the charge distribution inside a pixel cluster to resolve tracks that share one of more of their pixel detector hits. In practice, the pixel charge is discretized using the Time-over-Threshold (ToT) technique. More charge information is better for discrimination, but more challenging for designing and operating the detector. A model of the silicon pixels has been developed in order to study the impact of the precision of the digitized charge distribution on distinguishing multi-particle clusters. The output of the GEANT4-based simulation is used to train neutral networks that predict the multiplicity and location of particles depositing energy inside one cluster of pixels. By studying the multi-particle cluster identification efficiency and position resolution, we quantify the trade-off between the number of ToT bits and low-level tracking inputs. As both ATLAS and CMS are designing upgraded detectors, this work provides guidance for the pixel module designs to meet TIDE needs. [Preview Abstract] |
Monday, January 30, 2017 3:42PM - 3:54PM |
U9.00002: Chronopixels: particle detector R{\&}D for the ATLAS phase 2 upgrade Christian Weber, Keith Baker, Thomas Barker, Charles Baltay, Nikolai Sinev, Jim Brau, David Strom The pixel detector comprises the innermost part of the ATLAS detector. Its proximity to the interaction point together with its micrometer resolution allow for impact parameter determination and vertex fitting. This proximity however exposes it also to the highest radiation fluences and particle densities. The latter poses a challenge in inferring particle tracks from hit pixels, while the former leads to progressive radiation damage of the pixel detector itself. These problems will worsen after the LHC's third long shutdown in 2025 when it will operate in high luminosity mode at about five times the current instantaneous luminosity. These conditions will require the pixel detector to be replaced by one staffed with pixel modules capable of enduring the harsher radiation environment, and with finer granularity to cope with the increased pileup. Several efforts in the community are on their way to produce such a pixel module. We are presenting here the current status of our R{\&}D on such a pixel module: The Chronopixel for ATLAS phase 2, a fully monolithic active pixel sensor in CMOS technology. Sensing and readout electronics are included in each pixel here. As such it does not require expensive and labor intensive bump-bonding to a separate readout chip, reducing cost and material in the pixel detector. [Preview Abstract] |
Monday, January 30, 2017 3:54PM - 4:06PM |
U9.00003: Data Quality Monitoring System for New GEM Muon Detectors for the CMS Experiment Upgrade Robert King The Gas Electron Multiplier (GEM) detectors are novel detectors designed to improve the muon trigger and tracking performance in CMS experiment for the high luminosity upgrade of the LHC. Partial installation of GEM detectors is planned during the 2016-2017 technical stop. Before the GEM system is installed underground, its data acquisition (DAQ) electronics must be thoroughly tested. The DAQ system includes several commercial and custom-built electronic boards running custom firmware. The front-end electronics are radiation-hard and communicate via optical fibers. The data quality monitoring (DQM) software framework has been designed to provide online verification of the integrity of the data produced by the detector electronics, and to promptly identify potential hardware or firmware malfunctions in the system. Local hits reconstruction and clustering algorithms allow quality control of the data produced by each GEM chamber. Once the new detectors are installed, the DQM will monitor the stability and performance of the system during normal data-taking operations. We discuss the design of the DQM system, the software being developed to read out and process the detector data, and the methods used to identify and report hardware and firmware malfunctions of the system. [Preview Abstract] |
Monday, January 30, 2017 4:06PM - 4:18PM |
U9.00004: Analysis of Performance of a Radiation-Hard, Highly-Segmented Shashlik Electromagnetic Calorimeter in the CERN H4 Testbeam Eric Culbertson, Chris Neu, Gage DeZoort, Alexander Ledovskoy, Tutanon Sinthuprasith A shashlik style calorimeter with alternating tungsten and LYSO crystal plates underwent testbeam analysis to determine its energy resolution. A single shashlik module is a tiny rectangular prism composed of 28 2.5 mm thick tungsten plates alternating with 29 1.5 mm thick LYSO crystals, which each have a length and width of 14 mm. The expected stochastic energy resolution of this design was predicted to be ~10\%/$\sqrt{E}$ by standalone GEANT4 simulations and subsequent beam tests. A 4x4 array of shashlik modules has been tested using the H4 beamline at CERN. Following a correction to the nonlinearity of SiPM response, the energy resolution was determined. [Preview Abstract] |
Monday, January 30, 2017 4:18PM - 4:30PM |
U9.00005: Fast Timing Detector R{\&}D for Forward Proton Detectors at LHC Christina Snyder Quartz Timing Cherenkov (QUARTIC) detectors were tested at Fermilab Test Beam Facility in order to determine the timing resolution of very forward protons from collisions at the Large Hadron Collider (LHC). The active media of the detectors are quartz and sapphire, which are radiation hard and high light-yield materials. These detectors are constructed of 20 L-shaped bars that enable one to differentiate and detect more than one proton from the same LHC bunch crossing. The QUARTIC detectors have a small active area of \textasciitilde 4cm$^{\mathrm{2}}$, which is well-matched to the acceptance of the scattered protons. Our experimental results will be presented and further testing of this design is planned. [Preview Abstract] |
Monday, January 30, 2017 4:30PM - 4:42PM |
U9.00006: The FPGA based L1 track finding Tracklet approach Savvas Kyriacou The High Luminosity upgraded LHC is expected to deliver proton-proton collisions per 25ns with an estimated 140-200 pile up interactions per bunch crossing. Ultrafast track finding is vital for handling trigger rates in such conditions. An FPGA based road search algorithm is developed, the Tracklet approach one of a few currently under consideration, for the CMS L1 trigger system. Based on low/high transverse momentum track discrimination and designed for the HL upgraded outer tracker, the algorithm achieves microsecond scale track reconstruction in the expected high track multiplicity environment. The Tracklet method overview, implementation, hardware demonstrator and performance results are presented and discussed. [Preview Abstract] |
Monday, January 30, 2017 4:42PM - 4:54PM |
U9.00007: Scintillator Based Tracking Detectors for a Muon System at Future Colliders Dmitri Denisov, Valery Evdokimov, Strahinja Lukic, Predrag Ujic Extruded scintilator$+$WLS strips with SiPM readout for large muon detection systems were tested in the muon beam of the Fermilab Test Beam Facility. Light yield of up to 140 photoelectrons per muon per strip has been observed, as well as time resolution of 330 ps and position resolution along the strip of 5.4 cm. With such excellent performance parameters this detector is natural option for large scale future colliders muon systems. [Preview Abstract] |
Monday, January 30, 2017 4:54PM - 5:06PM |
U9.00008: The upgraded K-Long and Muon Detector at Belle II Taylor Kimmel We describe the KLM (KLong-Muon) detector for the Belle II detector at the SuperKEKB accelerator located at KEK in Tsukuba, Japan. The endcap RPC (Resistive Plate Chamber) detectors used for Belle have been entirely replaced with a scintillator-based system readout out with Si PMTs. The inner two layers of the barrel have also been replaced, while the outer thirteen layers remain instrumented with RPCs. The design of the detectors, their readout, and expected physics performance will be discussed. [Preview Abstract] |
Monday, January 30, 2017 5:06PM - 5:18PM |
U9.00009: Results of FE65-P2 Stability Tests for the High Luminosity LHC Upgrade Katherine Dunne The high luminosity upgrade of the LHC sets an imperative for readout technology capable of handling the consequences of higher particle interaction rates. Increased luminosity exists hand-in-hand with unprecedented levels of radiation and the need for exceptional logic density to store hit information during a trigger latency period on the order of 10 $\mu$s. The RD53 collaboration has developed specifications for the new generation of hybrid pixel readout chips to be included in the ATLAS and CMS Phase 2 upgrades. The FE65-P2 is a test readout chip fabricated on 65 nm CMOS technology that prototypes these design variants. Objectives of FE65-P2 include demonstrating the novel process of isolated analog front ends embedded in a digital design, known as ``analog islands in a digital sea.'' In addition, the innermost layer of the pixel detector in the upgraded ATLAS experiment will reach doses approaching 1 Mrad per run, and a single FE65-P2 should be tolerant to a lifetime dose near 500 Mrad. This talk will cover the test results of FE65-P2 calibration and stability. The experience gained from such tests will advise the development of RD53A, a large format readout chip to be fabricated in early 2017. [Preview Abstract] |
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