Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session L20: LHC Detector UpgradesLive
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Sponsoring Units: DPF Chair: Daniela Bortoletto, Oxford University |
Sunday, April 18, 2021 3:45PM - 3:57PM Live |
L20.00001: Electronics Calibrations for the ATLAS New Small Wheel Upgrade Anne Fortman This talk presents an overview of calibrations in the data acquisition system of the New Small Wheel upgrade to the ATLAS detector. The New Small Wheel (NSW) is a new muon detector scheduled for installation for the third data-taking run, or Run 3, at the LHC beginning in 2022. The NSW will be installed to fully take advantage of the increased collision rate offered in Run 3 and beyond, as swift and precise tracking of muons will be critical for identifying interesting and rare collision events amid the vast amount of data to be produced in future LHC runs. The NSW data acquisition electronics will be responsible for carrying data out of the NSW detector at a high rate. The performance of the electronics depends on a number of factors that must be continuously monitored and calibrated. We present the procedures and results of electronics calibrations that address the challenges associated with reading out data at a high rate at the NSW. [Preview Abstract] |
Sunday, April 18, 2021 3:57PM - 4:09PM Live |
L20.00002: Electrical and functional performance of the first full loaded ITk Strip stave at Brookhaven National Laboratory Francesca Capocasa The ATLAS experiment is currently preparing for an upgrade of the inner tracking detector for High-Luminosity LHC operation, scheduled to start in 2027. The new detector, known as the Inner Tracker or ITk, employs an all-silicon design with five inner Pixel layers and four outer Strip layers. The staves are the building blocks of the ITk Strip barrel layers. Each stave consists of a low-mass support structure which hosts the common electrical, optical and cooling services as well as 28 silicon modules, 14 on each side. The first pre-production electrical stave was assembled at BNL in December 2019. To characterize the stave, a set of electrical and functional measurements have been performed both at room and at cold temperature. In this talk I will present the methods used to characterize this stave with particular focus on noise studies. [Preview Abstract] |
Sunday, April 18, 2021 4:09PM - 4:21PM Live |
L20.00003: Missing transverse momentum algorithm improvements for the ATLAS Run 3 High Level Trigger Benjamin Carlson, Tae Min Hong The ATLAS missing transverse momentum trigger is susceptible to the impact of multiple proton-proton interactions (pileup) in the same event. To mitigate the impact of pileup, sophisticated subtraction schemes are utilized. During the Run 2 data-taking (2015-2018), these methods focused only on information from the calorimeter due to limited time available for the algorithms to utilize tracks in the HLT. HLT is the High Level Trigger software-based second-level trigger subsystem. In this talk, I will present updates on the missing transverse momentum trigger algorithms utilizing tracking information for Run 3 (2022-2025). [Preview Abstract] |
Sunday, April 18, 2021 4:21PM - 4:33PM Live |
L20.00004: Construction and Commissioning of the LHCb Upstream Tracker Scott Ely The Upstream Tracker (UT) for the LHCb upgrade for Run III of the LHC is currently being constructed. The UT, which sits just upstream of the dipole magnets, will enable a fast determination of track momentum. Thus, slow tracks will not need to be subjected to the downstream tracking. This will allow for a factor of three speed up of the fully software trigger. Modules consisting of a silicon sensor, hybrid flex-circuit, and SALT ASIC are being fabricated at INFN Milano and at Syracuse University. After testing electronically for quality assurance, completed modules are then mounted on to supporting staves, also built at Syracuse. Finally, the fully populated staves are shipped to CERN to be installed and commissioned for the experiment. This talk will give an overview of the construction and commissioning effort being carried out by the UT collaborating institutes. [Preview Abstract] |
Sunday, April 18, 2021 4:33PM - 4:45PM Live |
L20.00005: Electronics quality assurance of components of the Upstream Tracker Detector for the LHCb Upgrade I Xixin Liang The LHCb experiments is in the commissioning phase of an ambitious upgrade project that will allow a much upgraded sensitivity to interesting decays with a combination of higher luminosity and the deployment of a purely software trigger. A key element of the software trigger is a fast tracking based on the vertex detector and a tracking system located in front of the LHCb magnet, the Upstream Tracker (UT ). It is a silicon micro-strip detector with a novel front end ASIC that allows fast readout. A key goal is a high hit efficiency to be sure that the forward-tracking algorithm in the trigger will achieve the desired performance. To reach this goal, all components have to undergo a rigorous quality assurance process. There are four major testing steps: silicon sensor current versus voltage characterization, front end electronics (SALT) at different stages of the mechanics integration: on the hybrid panels, the assembled silicon-hybrid modules and in the final stage of the production, when 14 modules are mounted on the structures providing mechanical support and cooling (staves). Each step encompasses more than thousands of tests, including assessment of intrinsic and common mode electronics noise, gain measured with a test pulse calibration. The complete system comprises more than 1000 Si sensors and 500,000 signal channels. In order to finish this large task in a reliable and efficient manner, two electronic testing systems were set up in the high-energy physics laboratory at Syracuse University to select only components satisfying our performance criteria. [Preview Abstract] |
Sunday, April 18, 2021 4:45PM - 4:57PM Live |
L20.00006: Machine learning corrections to EM showers in the CMS HGCAL Christos Papageorgakis, Sarah Eno High granularity calorimeters, such as the CMS HGCAL, present new challenges that require novel techniques and approaches. While analytic algorithms to correct the energy measurement for inoperative or saturating readout channels have been developed for other calorimeters, the CMS HGCAL's non-projective geometry utilizing two different kinds of active material with hexagonal and trapezoidal channel segmentation limit this approach's precision. In this talk, we show that Machine learning allows a more precise correction for these effects, and reduces the constant term by 60\% compared to the 35\% reduction obtained using an averaging algorithm. [Preview Abstract] |
Sunday, April 18, 2021 4:57PM - 5:09PM Live |
L20.00007: Precision luminosity measurement with proton-proton collisions at the CMS experiment in Run 2 Chris Palmer Precision luminosity calibration is critical to determine fundamental parameters of the standard model and to constrain or to discover beyond-the-standard-model phenomena at LHC. The luminosity determination at the LHC interaction point 5 with the CMS detector, using proton-proton collisions at 13 TeV during Run 2 of the LHC (2015--2018), is reported. The absolute luminosity scale is obtained using beam-separation (``van der Meer'') scans. The dominant sources of systematic uncertainty are discussed. When applying the van der Meer calibration to the entire data-taking period, a substantial contribution to the total uncertainty in the integrated luminosity originates from the measurement of the detector linearity and stability. The reported integrated luminosity in 2015--2016 is among the most precise luminosity measurements at bunched-beam hadron colliders. [Preview Abstract] |
Sunday, April 18, 2021 5:09PM - 5:21PM Live |
L20.00008: Design, Construction and Commissioning of the Upgrade Radiation Damage and 4-anode PMT LED Monitoring Systems of the CMS Hadron Forward Calorimetry Ohannes Kamer Koseyan Being at the highest radiation areas of the CMS detector, the HF calorimeter is equipped with the radiation damage monitoring system of the quartz fibers. A certain number of quartz fibers are equipped with a special laser system where both the incident laser light intensity and the intensity of the laser light after traversing the quartz fiber can be measured with the same PMT in the same event. We have designed two new systems; 1- LED driver and light distribution systems to monitor the gain and stability of the 4 Anode PMTs that were installed during the HF-Phase I upgrades and a new on-line fiber radiation monitoring system. The new LED calibration unit concept is based on the fast LED driver and the control circuit residing on a mezzanine mounted onto the QIE board. Optics mix the light and distribute the light to the photodetector. We take LED measurements with high and low intensities to monitor the behavior and stability of 4-anode PMTs. 2- A new laser device was designed, constructed, and installed on the HF calorimeters. The module utilizes laser diode technology and is based on HF Phase I LED calibration unit concept. Optics mix the light and distribute the light to four output fibers. The module is completely compatible with HF Phase I electronics, software, and is installed in the HF front-end crates which are integrated to the HF calorimeters. The basic operational integrity of the recently produced LED and Raddam modules was tested extensively in the laboratory prior to installation. [Preview Abstract] |
Sunday, April 18, 2021 5:21PM - 5:33PM Live |
L20.00009: Introduction of an EM Feature Bit in the CMS Forward Hadron Calorimeter Mohammad Alhusseini The introduction of a new feature bit into the CMS forward hadron calorimeter (HF) is presented. The feature bit utilizes the energy deposition in HF's short and long energy fibers to discriminate between electrons and hadrons. A comprehensive study is presented to determine the viability of triggering on forward electrons using this feature bit during Run 3 collisions. [Preview Abstract] |
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