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 B20: Tracking Systems for LHC UpgradesLive
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Sponsoring Units: DPF Chair: Karl Ecklund, Rice |
Saturday, April 17, 2021 10:45AM - 10:57AM Live |
B20.00001: Characterization of pixel planar sensors for the inner tracker system of the phase 2 CMS detector Alvaro Guerrero Laos This talk will present the performance of silicon pixel sensors designed for the high-luminosity run of the Large Hadron Collider (HL-LHC). The HL-LHC is expected to operate at a peak instantaneous luminosity of 7.5x10\textasciicircum 34 cm\textasciicircum -2 s\textasciicircum -1, resulting in a total fluence of 2.3x10\textasciicircum 16 n\textunderscore eq/cm\textasciicircum 2 at the innermost layer of the pixel tracker, in center of the CMS detector. The ``Phase-2'' upgrade of the pixel detector must separate particle tracks in extremely dense collision debris: 140-200 collisions per bunch crossing. These conditions require thin, highly granular sensor components and readout chips that are radiation-tolerant, fast, and efficient. We tested prototype planar pixel sensors of 50 um x 50 um pitch and 150 um thickness at the Fermilab Test Beam Facility (FTBF), and measured efficiency around 99{\%} and resolution as good as 7.5 um [Preview Abstract] |
Saturday, April 17, 2021 10:57AM - 11:09AM Live |
B20.00002: Test Beam Studies of 3D Pixel Sensors for the CMS Phase-2 Upgrades and Measurement of the Beam Telescope Resolution at Fermilab Joseph Reichert The innermost tracking detector of CMS, the pixel detector, will be replaced in the mid-2020s in preparation for the high-luminosity run of the Large Hadron Collider (HL-LHC). The HL-LHC will deliver a total integrated luminosity which is more than a factor of ten larger than the current LHC will deliver to CMS, which necessitates the use of silicon pixel sensors that perform well even after radiation fluences as large as $2 \times 10^{16}$ $\mathrm{n}_\mathrm{eq}/\mathrm{cm}^2$. 3D silicon pixel sensor technology is being considered for use by CMS, and this talk will present studies of these 3D sensors performed at the Fermilab Test Beam Facility (FTBF). In addition, a measurement of the FTBF telescope resolution will be presented, which relies on the small charge sharing distances intrinsic to the 3D pixel sensor technology. [Preview Abstract] |
Saturday, April 17, 2021 11:09AM - 11:21AM Live |
B20.00003: Measurements of LGAD sensors with 120 GeV proton beam for CMS MTD Endcap Timing Layer Hakseong Lee The simultaneous interaction per bunch crossing (pileup) that gives rise to the rate of false triggers is one of the major challenges during the high luminosity LHC (HL-LHC) running. The development of mitigation techniques based on 4D reconstruction using timing information is expected to significantly reduce the effect of pileup by helping to find the correct primary vertex. The minimum ionizing particle (MIP) Timing Detector (MTD), which is planned to be installed for the CMS Phase-II Upgrade, is designed to provide timing information for the MIP with a 30-40 ps resolution. In order to guarantee this level of timing performance, low gain avalanche detectors (LGAD) silicon sensors are going to be used for endcap timing layer (ETL). We present the measurement of LGAD sensors for timing resolution and radiation hardness with a 120 GeV proton beam at the Fermilab Test Beam Facility. [Preview Abstract] |
Saturday, April 17, 2021 11:21AM - 11:33AM Live |
B20.00004: Overall Description of UT Electronic Components Zhuoming Li The Upstream Tracker (UT) is a large-area silicon-strip detector being constructed for the LHCb Upgrade. It plays a key role in that it enables a rapid momentum measurement to be performed, and usage of that information increases the speed at which the software trigger operates by about factor of three. The readout system of the UT -- and all other LHCb detectors -- runs at the full LHC beam-beam crossing rate of 40 MHz, allowing every event to be fully analyzed in the software trigger. This talk will present the components of the UT readout electronics, which includes a custom ASIC, Kapton hybrids, flex cables that transport signals to the periphery, and peripheral electronics that process and package the signals for the data acquisition system and experimental trigger. And the data flow within those components will also be briefly discussed. [Preview Abstract] |
Saturday, April 17, 2021 11:33AM - 11:45AM Live |
B20.00005: Module Production for the UT Hangyi Wu The LHCb upgrade is based on all detectors being able to output data in real time at a 40 MHz rate. This requires replacing sensors and kapton hybrid circuits containing the SALT electronic chips that processes the data from the sensors. Here I explain that the hybrid currents have ASICs mounted on them in Milano and shipped to Syracuse where the hybrids and silicon sensors are assembled, wire-bonded, potted and tested. [Preview Abstract] |
Saturday, April 17, 2021 11:45AM - 11:57AM Live |
B20.00006: LHCb Upgrade: Periphery Electronics Processing Interface for the Upstream Tracker Alex Fernez The LHCb experiment at CERN performs world-leading flavor physics measurements. The forward detector features precise vertexing and tracking abilities and was capable of triggering at a rate of 1 MHz and collecting 1-2 fb$^{-1}$ of data per year during LHC Run 2. However, many results will benefit from much larger datasets that require a major upgrade of the detector. The upgrade will offer improved detection performance and will employ a 40 MHz trigger, resulting in more than 5 fb$^{-1}$ of data to be collected per year. This talk will give an overview of the upgrade of the silicon microstrip Upstream Tracker (UT), which accomplishes this 40 MHz readout by including up to 40 serial links per sensor running at 320 Mbps each. In particular, the talk will highlight the UT periphery electronics processing interface (PEPI). PEPI includes data concentrator boards (DCB) that serialize sensor data into 4.8 Gbps signals, optically send that data to central DAQ, and provide a reference clock for front-end readout electronics, and it includes backplanes that route the sensor data to the DCBs. These PEPI components, along with low voltage regulators (LVR) that provide power to PEPI and to staves with the sensors mounted on them, comprise UMD's contribution to the LHCb detector upgrade. [Preview Abstract] |
Saturday, April 17, 2021 11:57AM - 12:09PM Live |
B20.00007: Construction and Measurement of Mechanical Components for the LHCb Upstream Tracker Harris Bernstein The LHCb experiment is designed to study CP violation and other rare phenomena by observing decays of beauty and charm hadrons. A major upgrade of the LHCb detector is being installed during the LHC's second long shutdown, which will equip the detector to take data at a higher luminosity and read out its electronic components at a rate of 40 MHz. The Upstream Tracker is a major part of this upgrade. It is a new silicon strip detector, located upstream of the LHCb bending magnet, composed of four planes of silicon sensors mounted on both sides of vertical structures called staves which provide mechanical support and CO$_{\mathrm{2}}$ evaporative cooling. The staves are a sandwich structure design consisting of carbon fiber facing sheets surrounding a foam core in which titanium cooling tubes are embedded. The staves support flexible printed circuit board cables on which the sensors and application specific integrated circuits will be attached. There are three different types of stave design, with different types of cable and sensor designs according to occupancy. In this contribution, the ongoing stave construction is reviewed with emphasis on mechanical measurements of its components and sub-assemblies. Specific attention is given to the attachment of the flex cables, the fabrication of the cooling tube sub-assemblies, and their associated metrics. [Preview Abstract] |
Saturday, April 17, 2021 12:09PM - 12:21PM Live |
B20.00008: ~International Shipments of Sensitive Equipment for the LHCb Upstream Tracker Joseph Shupperd As a part of an international experimental collaboration, the shipment of delicate equipment is an unavoidable task. This requires consideration of both the specific demands of the equipment and the limitations of the shipping services. For the Upstream Tracker, part of the LHCb upgrade, there are major components that must be shipped between continents. The shipping procedures for these items have been carefully thought out and designed to ensure safe transport. Challenges include delicate exposed wire bonds that are susceptible to damage from both vibrational and environmental sources, mechanical structures that are not designed to withstand rough handling, and electric charge buildup on onboard electronics. This requires special transport containers to be built and techniques to be developed to ensure safe delivery. This talk will cover vibrational damping techniques, methods to combat varying environmental conditions, and electrostatic mitigation. Typical data from several international shipments will be shown from vibrational, temperature, humidity, and pressure monitors. [Preview Abstract] |
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