Showing papers by "Marcel Michael Stanitzki published in 2020"

Performance of electron and photon triggers in ATLAS during LHC Run 2

Abstract: Electron and photon triggers covering transverse energies from 5 GeV to several TeV are essential for the ATLAS experiment to record signals for a wide variety of physics: from Standard Model processes to searches for new phenomena in both proton–proton and heavy-ion collisions. To cope with a fourfold increase of peak LHC luminosity from 2015 to 2018 (Run 2), to 2.1×1034cm-2s-1, and a similar increase in the number of interactions per beam-crossing to about 60, trigger algorithms and selections were optimised to control the rates while retaining a high efficiency for physics analyses. For proton–proton collisions, the single-electron trigger efficiency relative to a single-electron offline selection is at least 75% for an offline electron of 31 GeV, and rises to 96% at 60 GeV; the trigger efficiency of a 25 GeV leg of the primary diphoton trigger relative to a tight offline photon selection is more than 96% for an offline photon of 30 GeV. For heavy-ion collisions, the primary electron and photon trigger efficiencies relative to the corresponding standard offline selections are at least 84% and 95%, respectively, at 5 GeV above the corresponding trigger threshold.

The ABC130 barrel module prototyping programme for the ATLAS strip tracker

Abstract: For the Phase-II Upgrade of the ATLAS Detector [1], its Inner Detector, consisting of silicon pixel, silicon strip and transition radiation sub-detectors, will be replaced with an all new 100% sili ...

EUDAQ - A data acquisition software framework for common beam telescopes

Abstract: EUDAQ is a generic data acquisition software developed for use in conjunction with common beam telescopes at charged particle beam lines. Providing high-precision reference tracks for performance studies of new sensors, beam telescopes are essential for the research and development towards future detectors for high-energy physics. As beam time is a highly limited resource, EUDAQ has been designed with reliability and ease-of-use in mind. It enables flexible integration of different independent devices under test via their specific data acquisition systems into a top-level framework. EUDAQ controls all components globally, handles the data flow centrally and synchronises and records the data streams. Over the past decade, EUDAQ has been deployed as part of a wide range of successful test beam campaigns and detector development applications.

The ABC130 barrel module prototyping programme for the ATLAS strip tracker.

Abstract: For the Phase-II Upgrade of the ATLAS Detector, its Inner Detector, consisting of silicon pixel, silicon strip and transition radiation sub-detectors, will be replaced with an all new 100 % silicon tracker, composed of a pixel tracker at inner radii and a strip tracker at outer radii. The future ATLAS strip tracker will include 11,000 silicon sensor modules in the central region (barrel) and 7,000 modules in the forward region (end-caps), which are foreseen to be constructed over a period of 3.5 years. The construction of each module consists of a series of assembly and quality control steps, which were engineered to be identical for all production sites. In order to develop the tooling and procedures for assembly and testing of these modules, two series of major prototyping programs were conducted: an early program using readout chips designed using a 250 nm fabrication process (ABCN-25) and a subsequent program using a follow-up chip set made using 130 nm processing (ABC130 and HCC130 chips). This second generation of readout chips was used for an extensive prototyping program that produced around 100 barrel-type modules and contributed significantly to the development of the final module layout. This paper gives an overview of the components used in ABC130 barrel modules, their assembly procedure and findings resulting from their tests.

An Overview of the CERN Beamline for Schools Competition

Abstract: Since 2014 CERN has been organizing “Beamline for Schools” (BL4S), an international science competition for teams of high school students. The students are asked to propose an experiment that can b...

Lycoris -- a large-area, high resolution beam telescope

Abstract: A high-resolution beam telescope is one of the most important and demanding infrastructure components at any test beam facility. Its main purpose is to provide reference particle tracks from the incoming test beam particles to the test beam users, which allows measurement of the performance of the device-under-test (DUT). Lycoris, a six-plane compact beam telescope with an active area of $\sim10\times10$ cm$^2$ (extensible to $10\times20$ cm$^2$) was installed at the DESY II Test Beam Facility in 2019, to provide a precise momentum measurement in a 1 T solenoid magnet or to provide tracking over a large area. The overall design of Lycoris will be described as well as the performance of the chosen silicon sensor. The 25 $\mu$m pitch micro-strip sensor used for Lycoris was originally designed for the SiD detector concept for the International Linear Collider, which adopts a second metallization layer to route signals from strips to the bump-bonded KPiX ASIC and then uses a wire-bonded flex cable for the connection to the DAQ and the power supply system. This arrangement eliminates the need for a complex hybrid, and its performance was tested for the first time in this project. The system performance has been evaluated at the DESY II Test Beam Facility in several test-beam campaigns and will be presented in this paper.

Recent Results from the First lpGBT-based Prototype of the End-of-Substructure Card for the ATLAS ITk Strip Detector

Abstract: The main building blocks of the ATLAS Inner Tracker (ITk) Strip Detector, to be installed for the High-Luminosity Upgrade of the Large Hadron Collider (HL-LHC), are modules that host sensors and front-end ASICs. Carbon-fibre substructures provide mechanical support to up to 14 modules per side. An End-of-Substructure (EoS) card on each substructure side connects up to 28 differential data lines at 640 Mbit/s from the module to low-powered GigaBit Transceivers (lpGBT) ASICs for data serialisation and uses 10 GBit/s optical links to transmit signals to the off-detector systems via the Versatile Link PLUS (VL+) transceiver module, VTRx+. Prototype EoS cards have been designed and extensively tested using lpGBT and VTRx+ prototypes. The status of the electronics design and recent results of tests of electrical and data processing performance based on these prototypes are presented.

Development of a large active area beam telescope based on the SiD microstrip sensor

Abstract: A beam telescope as one of the most important and often requested test beam equipment provides particle tracking to test beam users. At the DESY II test beam facility, a new beam telescope called Lycoris based on a microstrip sensor has been designed to address the user demands for momentum measurement in a 1 T solenoid magnet or large area tracking with limited space (3.5 cm between the potential user device and the magnet inner wall). Lycoris is designed to provide a high-precision resolution of at least ∼ 10 µm along the bending direction, and a large active area of 10 × 10 cm2 to cover at least 90% of the beam particles at energies of 1-6 GeV. The microstrip sensor was originally designed for the Silicon Detector (SiD) at the International Linear Collider (ILC), which adopted a hybrid-less design, i.e. a second metallization layer is used to route signals from strips to the bump-bonded ASIC, and from the ASIC to a wire-bond pad to the outside. This hybrid-less arrangement eliminates the need for a complex hybrid design, and its functioning is first-time tested in this project. The performance of the sensor modules was firstly tested in the lab then at the DESY II test beam facility in August/September 2018, and the results will be presented here. In addition, a summary will be given at the end with an overview of the ongoing test beam campaign of the Lycoris prototype in February 2019.

First lpGBT-based prototype of the End-of-Substructure (EoS) card for the ATLAS Strip Tracker Upgrade

Abstract: The central building blocks of the ATLAS Strip Tracker Upgrade are the staves and petals which host up to 14 modules per side. The incoming data is sent to the EoS and multiplexed by the lpGBT chips on 10 Gbit/s links and sent via optical transmitters (VL+) off-detector. The EoS is a critical component for the upgrade, sitting at a single-point-of failure location. Prototype boards have been designed, manufactured and tested using the first available lpGBT and VL+ prototypes from CERN. We present the first test results and give an outlook towards the production of 2000 boards using these chips.