The VMM readout system Alexopoulos, T.; Antrim, D.; Bakalis, C. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/2020, Letnik:
955, Številka:
C
Journal Article
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The New Small Wheel Upgrade of the ATLAS experiment at CERN, planned to take place at 2020, requires a new generation of front-end electronics that will support its data acquisition requirements. The ...VMM Application-Specific Integrated Circuit has been in development for the last seven years to serve as the foundation of the New Small Wheel’s readout scheme. It has gone through three major revisions and a minor one, the latter being the production version. To facilitate the testing and readout of the VMM, as well as to study its detector performance, a complete readout system has been developed. It consists of flexible Field-Programmable Gate Array logic with extensive functionality, and an efficient software framework providing the user interface. This system, referred to as the ”The VMM Readout System”, has been used in test-beam campaigns at CERN, as well as in bench calibration and testing measurement scenarios for the past several years, supporting all readout modes and features of the VMM.
ATLAS data preparation in run 2 Laycock, PJ; Chelstowska, MA; Donszelmann, TC ...
Journal of physics. Conference series,
10/2017, Letnik:
898, Številka:
4
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In this contribution, the data preparation workflows for Run 2 are presented. The challenges posed by the excellent performance and high live time fraction of the LHC are discussed, and the solutions ...implemented by ATLAS are described. The prompt calibration loop procedures are described and examples are given. Several levels of data quality assessment are used to quickly spot problems in the control room and prevent data loss, and to provide the final selection used for physics analysis. Finally the data quality efficiency for physics analysis is shown.
This first year of data taking has been of great interest, not only for the physics outcome, but also for operating the system under the environment it was designed for. The online data quality ...monitoring framework (DQMF) is a highly scalable distributed framework which is used to assess the operational conditions of the detector and the quality of the data. DQMF provides quick feedback to the user about the functioning and performance of the sub-detectors by performing over 75,000 advanced data quality checks, with rates varying depending on histogram update frequency. The DQM display (DQMD) is the visualisation tool with which histograms and their data quality assessments can be accessed. It allows for great flexibility for displaying histograms, their reference when applicable, configurations used for the automatics checks, data quality flags and much more. The DQM configuration is stored in a database that can be easily created and edited with the DQM Configurator tool (DQMC). This paper is describing the design and implementation of the DQMF and its display as well as the data quality performance achieved during this first year of data taking.
The start of collisions at the LHC brings a new era of particle physics and much improved potential to observe signatures of new physics. Some of these may be evident already from the very beginning ...of collisions. It's essential at this point in the experiment to be prepared to quickly and efficiently determine the quality of the incoming data. Easy visualization of data for the shift crew and experts is one of the key factors in the data quality assessment process. This paper describes the design and implementation of the Data Quality Monitoring Display and discusses experience from its usage and performance during ATLAS commissioning with cosmic ray and single beam data.
The VMM readout system Alexopoulos, T.; Antrim, D.; Bakalis, Christos ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2019, Letnik:
955, Številka:
C
Journal Article
Recenzirano
Odprti dostop
The New Small Wheel Upgrade of the ATLAS experiment at CERN, planned to take place at 2020, requires a new generation of front-end electronics that will support its data acquisition requirements. ...Here, the VMM Application-Specific Integrated Circuit has been in development for the last seven years to serve as the foundation of the New Small Wheel's readout scheme. It has gone through three major revisions and a minor one, the latter being the production version. To facilitate the testing and readout of the VMM, as well as to study its detector performance, a complete readout system has been developed. It consists of flexible Field-Programmable Gate Array logic with extensive functionality, and an efficient software framework providing the user interface. This system, referred to as the "The VMM Readout System", has been used in test-beam campaigns at CERN, as well as in bench calibration and testing measurement scenarios for the past several years, supporting all readout modes and features of the VMM.
Every minute of an ATLAS data taking session, the monitoring framework serves several thousands of physics events to the monitoring data analysis applications and handles millions of histogram ...updates coming from many different applications. This framework also executes over forty thousand advanced data quality checks for a subset of those histograms and displays those histograms together with the results of all those checks on several dozens of monitors installed in main and satellite ATLAS control rooms.
The Data Quality Monitoring Display (DQMD) is the visualization tool for the automatic data quality assessment. It is the interface through which the shift crew and the experts can validate the quality of the data being recorded or processed, be warned of problems related to data quality, and identify the origin of such problems. This tool allows great flexibility for visualization of histograms, with an overlay of reference histograms when applicable, configurations used for automatic checking of those histograms, and the results. The display configuration is stored in a database, that can be easily created and edited with the Data Quality Monitoring Configurator (DQMC) tool.
The first months of collisions data taking turned into a very successful experience for the monitoring framework and translated into several improvements to easy usability and efficient information transfer. A description of the design and implementation of the DQMD and DQMC will be presented, as well as the performance of the monitoring framework during the first ATLAS run and the recent upgrades concerning alarm handling and parameters finding.
We have searched for exclusive {gamma}{gamma} production in proton-antiproton collisions at {radical}(s)=1.96 TeV, using 532 pb{sup -1} of integrated luminosity taken by the run II Collider Detector ...at Fermilab. The event signature requires two electromagnetic showers, each with transverse energy E{sub T}>5 GeV and pseudorapidity |{eta}|<1.0, with no other particles detected in the event. Three candidate events are observed. We discuss the consistency of the three events with {gamma}{gamma}, {pi}{sup 0}{pi}{sup 0}, or {eta}{eta} production. The probability that other processes fluctuate to {>=}3 events is 1.7x10{sup -4}. An upper limit on the cross section of pp{yields}p+{gamma}{gamma}+p production is set at 410 fb with 95% confidence level.
We report an observation of new bottom baryons produced in pp collisions at the Tevatron. Using 1.1 fb{sup -1} of data collected by the CDF II detector, we observe four {lambda}{sub b}{sup 0}{pi}{sup ...{+-}} resonances in the fully reconstructed decay mode {lambda}{sub b}{sup 0}{yields}{lambda}{sub c}{sup +}{pi}{sup -}, where {lambda}{sub c}{sup +}{yields}pK{sup -}{pi}{sup +}. We interpret these states as the {sigma}{sub b}{sup (*){+-}} baryons and measure the following masses: m{sub {sigma}{sub b}{sup +}}=5807.8{sub -2.2}{sup +2.0}(stat.){+-}1.7(syst.) MeV/c{sup 2}, m{sub {sigma}{sub b}{sup -}}=5815.2{+-}1.0(stat.){+-}1.7(syst.) MeV/c{sup 2}, and m({sigma}{sub b}*)-m({sigma}{sub b})=21.2{sub -1.9}{sup +2.0}(stat.){sub -0.3}{sup +0.4}(syst.) MeV/c{sup 2}.
An experimental study of the normalized three-jet rate of b quark events with respect to light quarks events (light=ℓ≡u,d,s) has been performed using the CAMBRIDGE and DURHAM jet algorithms. The data ...used were collected by the DELPHI experiment at LEP on the Z peak from 1994 to 2000. The results are found to agree with theoretical predictions treating mass corrections at next-to-leading order. Measurements of the b quark mass have also been performed for both the b pole mass: Mb and the b running mass: mb(MZ). Data are found to be better described when using the running mass. The measurement yields: \(m_b(M_Z)=2.85\pm0.18 (\text{stat}) \pm0.13 (\text{exp}) \pm0.19 (\text{had}) \pm0.12 (\text{theo}) \text{GeV}/c^2.\)for the CAMBRIDGE algorithm.This result is the most precise measurement of the b mass derived from a high energy process. When compared to other b mass determinations by experiments at lower energy scales, this value agrees with the prediction of quantum chromodynamics for the energy evolution of the running mass. The mass measurement is equivalent to a test of the flavour independence of the strong coupling constant with an accuracy of 7 ‰.
We present a search for associated production of the chargino and neutralino supersymmetric particles using up to 1.1 fb{sup -1} of integrated luminosity collected by the CDF II experiment at the ...Tevatron pp collider at {radical}(s)=1.96 TeV. We analyze events with a large transverse momentum imbalance and either three charged leptons or two charged leptons of the same electric charge. The numbers of observed events are consistent with standard model expectations. Upper limits on the production cross section are derived in different theoretical models.
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