Bulletin of the American Physical Society
APS April Meeting 2017
Volume 62, Number 1
Saturday–Tuesday, January 28–31, 2017; Washington, DC
Session S9: Accelerator and Detector Upgrades |
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Sponsoring Units: DPF Chair: Bob Tschirhart, FermiLab Room: Roosevelt 1 |
Monday, January 30, 2017 1:30PM - 1:42PM |
S9.00001: Qualification of the modules for the Phase 1 upgrade of the CMS forward pixel detector Irving Sandoval Gonzalez The innermost component of the Compact Muon Solenoid (CMS) detector, the silicon pixel tracker, will be replaced by a new device in early 2017 to cope with the significant increase in instantaneous luminosity expected for the remainder of Run 2 of the Large Hadron Collider. The upgraded detector is composed of two subcomponents: the barrel pixel (BPIX) and the forward pixel (FPIX). In this work, we describe the testing and calibration procedures that the FPIX detector subcomponents underwent as well as the quality assurance criteria used for selecting the best detector modules for the final installation. [Preview Abstract] |
Monday, January 30, 2017 1:42PM - 1:54PM |
S9.00002: Tests of the CMS Phase 1 Upgrade FPIX Half Cylinders Xuan Chen The pixel detector is an integral part of the CMS silicon tracker, designed to measure the position and momentum of charged particles produced in high-energy collisions at the Large Hadron Collider (LHC). The phase 1 upgrade of the CMS forward pixel detector will replace the existing forward pixel detector at the end of 2016. This upgrade will include three forward disks on each end, and is organized in four mechanical support structures, called half-cylinders. Each half-cylinder contains frontend readout electronic boards, power regulators, cables and fibers in addition to the three half disks with the active pixel modules. Full system tests are being performed on the half cylinders after each step of assembly and after its completion. I will describe the various steps of the the testing and qualification procedure, focusing on the final assembly and the full system test for the integrated half-cylinder. I will also discuss the results obtained for the completed detector before its shipment to CERN. [Preview Abstract] |
Monday, January 30, 2017 1:54PM - 2:06PM |
S9.00003: ABSTRACT MOVED TO F1.40 |
Monday, January 30, 2017 2:06PM - 2:18PM |
S9.00004: Module production for the Phase 1 upgrade of the CMS forward pixel detector Joaquin Siado Castaneda For Run 2 the Large Hadron Collider will run at a much higher instantaneous luminosity, which requires an upgrade of the CMS pixel detector. The detector consists of rectangular silicon sensors, segmented into 100 $\mu m$ by 150 $\mu m$ pixels, bonded to readout chips, with one sensor and a 8x2 array of readout chips forming a module. Due to its high granularity and good spatial resolution, about 10 $\mu m$ for a single hit, the pixel detector is used for track reconstruction, pileup mitigation, and b-quark tagging in many physics analyses. Being the innermost sub-detector of CMS it receives the most radiation damage, and therefore needs to be replaced most often. For the phase 1 upgrade an additional disk in the forward region and increased buffer space in the readout chip will improve the pixel performance by increasing efficiency and reducing fake rates. The University of Nebraska-Lincoln is one of the two sites where modules are being assembled. This talk features the steps of the assembly process as well as challenges encountered and overcome during production of over 500 modules. [Preview Abstract] |
Monday, January 30, 2017 2:18PM - 2:30PM |
S9.00005: ATLAS level-1 calorimeter trigger: Run-2 performance and Phase-1 upgrades Ben Carlson, Tae Min Hong The Run-2 performance and Phase-1 upgrade are presented for the hardware-based level-1 calorimeter trigger (L1Calo) for the ATLAS Experiment. This trigger has a latency of about 2.2 microseconds to make a decision to help ATLAS select about 100 kHz of the most interesting collisions from the nominal LHC rate of 40 MHz. We summarize the upgrade after Run-1 (2009-2012) and discuss its performance in Run-2 (2015-current). We also outline the on-going Phase-1 upgrade for the next run (2021-2024) and its expected performance. [Preview Abstract] |
Monday, January 30, 2017 2:30PM - 2:42PM |
S9.00006: The CMS Level-1 Calorimeter Trigger for LHC Run II Tutanon Sinthuprasith The phase-1 upgrades of the CMS Level-1 calorimeter trigger have been completed. The Level-1 trigger has been fully commissioned and it will be used by CMS to collect data starting from the 2016 data run. The new trigger has been designed to improve the performance at high luminosity and large number of simultaneous inelastic collisions per crossing (pile-up). For this purpose it uses a novel design, the Time Multiplexed Design, which enables the data from an event to be processed by a single trigger processor at full granularity over several bunch crossings. The TMT design is a modular design based on the uTCA standard. The architecture is flexible and the number of trigger processors can be expanded according to the physics needs of CMS. Intelligent, more complex, and innovative algorithms are now the core of the first decision layer of CMS: the upgraded trigger system implements pattern recognition and MVA (Boosted Decision Tree) regression techniques in the trigger processors for pT assignment, pile up subtraction, and isolation requirements for electrons, and taus. The performance of the TMT design and the latency measurements and the algorithm performance which has been measured using data is also presented here. [Preview Abstract] |
Monday, January 30, 2017 2:42PM - 2:54PM |
S9.00007: Upgrades to the CMS Cathode Strip Chambers for 2017 and the High Luminosity LHC David Morse An overview will be given of upgrades to the CMS Cathode Strip Chambers (CSC) during the extended technical stop 2016-2017 and plans for future upgrades targeting the HL-LHC. HL-LHC conditions will surpass the physical capabilities of the present detector, and require novel hardware to cope with increased rates and maintain the high performance of the CSC achieved up to now. [Preview Abstract] |
Monday, January 30, 2017 2:54PM - 3:06PM |
S9.00008: Quality Control of the Large-area GEM detectors at Production Sites for the CMS Muon Endcap Upgrade Mehdi Rahmani GEM (Gas Electron Multipliers) detectors will be installed in the high-eta region of the CMS muon system by the year 2019. With precise tracking and fast trigger information, these detectors will significantly improve the CMS muon triggering after the second long shutdown of the LHC. There are six sites, external to CERN, where at total of 160 1-meter long GEM detectors will be produced. We present the detector construction and discuss the critical quality control (QC) procedures implemented for chamber commissioning. Some of the most important QCs discussed are: current leakage tests, gas leak tests, gain measurements, high voltage test and response uniformity test. We discuss the criteria that are used to accept or reject a GEM detector based on the QC results. The production and QC status will be presented as well. [Preview Abstract] |
Monday, January 30, 2017 3:06PM - 3:18PM |
S9.00009: Fermilab’s Proton Accelerator Complex : World Record Performance and Upgrade Plans Vladimir Shiltsev The flagship of Fermilab's long term research program is the Deep Underground Neutrino Experiment (DUNE), located Sanford Underground Research Facility (SURF) in Lead, South Dakota, which will study neutrino oscillations with a baseline of 1300 km. The neutrinos will be produced in the Long Baseline Neutrino Facility (LBNF), a proposed new beam line from Fermilab's Main Injector. The physics goals of the DUNE require a proton beam with a power of some 2.4 MW at 120 GeV, which is roughly four times the current maximum power. Here I discuss current performance of the Fermilab proton accelerator complex, our plans for construction of the SRF proton linac as key part of the Proton Improvement Plan-II (PIP-II), outline the main challenges toward multi-MW beam power operation of the Fermilab accelerator complex and the staged plan to achieve the required performance over the next 15 years. [Preview Abstract] |
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