Journal: Journal of Instrumentation

Abbreviation

JINST

Publisher

IOP Publishing

Journal Volumes

ISSN

1748-0221

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Publications 1 - 10 of 247
  • Commissioning of the CMS High-Level Trigger with Cosmic Rays
    Item type: Journal Article
    CMS Collaboration; Chatrchyan, Serguei; Betev, Botio; et al. (2010)
    Journal of Instrumentation
  • Identification of b-quark jets with the CMS experiment
    Item type: Journal Article
    CMS Collaboration; Chatrchyan, Serguei; Bäni, Lukas; et al. (2013)
    Journal of Instrumentation
    At the Large Hadron Collider, the identification of jets originating from b quarks is important for searches for new physics and for measurements of standard model processes. A variety of algorithms has been developed by CMS to select b-quark jets based on variables such as the impact parameters of charged-particle tracks, the properties of reconstructed decay vertices, and the presence or absence of a lepton, or combinations thereof. The performance of these algorithms has been measured using data from proton-proton collisions at the LHC and compared with expectations based on simulation. The data used in this study were recorded in 2011 at √s = 7 TeV for a total integrated luminosity of 5.0 fb-1. The efficiency for tagging b-quark jets has been measured in events from multijet and t-quark pair production. CMS has achieved a b-jet tagging efficiency of 85% for a light-parton misidentification probability of 10% in multijet events. For analyses requiring higher purity, a misidentification probability of only 1.5% has been achieved, for a 70% b-jet tagging efficiency.
  • High-power Fixed-Field Accelerators
    Item type: Journal Article
    Winklehner, Daniel; Adelmann, Andreas; Alonso, J.R.; et al. (2023)
    Journal of Instrumentation
    We report the state of the field of High-Power Fixed-Field Accelerators (with an emphasis on cyclotrons) as discussed by international experts during a three-day workshop of the same name in 2021. The workshop was part of the Snowmass'21 Community Planning Exercise. Here, we take stock of the world inventory of high-power fixed-field accelerators, assess available beam currents and beam powers, and investigate limitations. Furthermore, we evaluate the role of these machines in particle physics, directly used or as injectors to other machines, and in industry, as drivers for (medical) isotope production and, potentially, for accelerator-driven systems and sub-critical reactors. Finally, we discuss novel concepts and cutting-edge developments to push the available current higher at several energy scales, thereby increasing relative power. Highlights include new spiral inflector types, direct RFQ injection, H2+ acceleration, utilizing vortex motion, and self-extraction schemes. We also discuss modern computational frameworks to optimize accelerators more efficiently, and better describe the relevant physical processes in simulations.
  • Volume III. DUNE far detector technical coordination
    Item type: Review Article
    DUNE Collaboration; Abi, Babak; Alt, Christoph; et al. (2020)
    Journal of Instrumentation
    The preponderance of matter over antimatter in the early universe, the dynamics of the supernovae that produced the heavy elements necessary for life, and whether protons eventually decay-these mysteries at the forefront of particle physics and astrophysics are key to understanding the early evolution of our universe, its current state, and its eventual fate. The Deep Underground Neutrino Experiment (DUNE) is an international world-class experiment dedicated to addressing these questions as it searches for leptonic charge-parity symmetry violation, stands ready to capture supernova neutrino bursts, and seeks to observe nucleon decay as a signature of a grand unified theory underlying the standard model. The DUNE far detector technical design report (TDR) describes the DUNE physics program and the technical designs of the single- A nd dual-phase DUNE liquid argon TPC far detector modules. Volume III of this TDR describes how the activities required to design, construct, fabricate, install, and commission the DUNE far detector modules are organized and managed. This volume details the organizational structures that will carry out and/or oversee the planned far detector activities safely, successfully, on time, and on budget. It presents overviews of the facilities, supporting infrastructure, and detectors for context, and it outlines the project-related functions and methodologies used by the DUNE technical coordination organization, focusing on the areas of integration engineering, technical reviews, quality assurance and control, and safety oversight. Because of its more advanced stage of development, functional examples presented in this volume focus primarily on the single-phase (SP) detector module.
  • Application of the VMM3a/SRS: a t₀-less TWIN GEM-based TPC
    Item type: Journal Article
    Flöthner, K.J.; Garcia, Francisco; Banto Oberhauser, Benjamin; et al. (2025)
    Journal of Instrumentation
    Integrating the ATLAS/BNL VMM3a ASIC (Application Specific Integrated Circuit) into the RD51/SRS (Scalable Readout System) provides a self-triggered continuous readout system for various gaseous detectors. Since the system allows flexible parameters, such as switching the polarity, adjusting electronics gain or different peaking times, the settings can be adjusted for a wide range of detectors. The system allows particles to be recorded with a MHz interaction rate in energy, space, and time. The system is used as a trigger-less readout for the TWIN GEM-TPC (Gas Electron Multiplier-Time Projection Chamber) to prove the operation without external t₀ of such a TPC configuration. First results of position reconstruction with the TWIN GEM-TPC are presented, with a spatial resolution around 220 µm in X, and 330 µm in Y. Y is reconstructed from the time information, and X from the 1D strip readout. Operating the setup as an ultra-low material budget tracking telescope, an angular distribution can be extracted in the horizontal and vertical planes. Giving distributions with σₕ = 0.15° in the horizontal plane and in the vertical plane σv between 0.3° and 0.9°, depending on the reconstruction method.
  • Electron and photon reconstruction and identification with the CMS experiment at the CERN LHC
    Item type: Journal Article
    CMS Collaboration; Sirunyan, Albert M.; Backhaus, Malte; et al. (2021)
    Journal of Instrumentation
    The performance is presented of the reconstruction and identification algorithms for electrons and photons with the CMS experiment at the LHC. The reported results are based on proton-proton collision data collected at a center-of-mass energy of 13 TeV and recorded in 2016–2018, corresponding to an integrated luminosity of 136 fb^-1. Results obtained from lead-lead collision data collected at √(sNN)=5.02 TeV are also presented. Innovative techniques are used to reconstruct the electron and photon signals in the detector and to optimize the energy resolution. Events with electrons and photons in the final state are used to measure the energy resolution and energy scale uncertainty in the recorded events. The measured energy resolution for electrons produced in Z boson decays in proton-proton collision data ranges from 2 to 5%, depending on electron pseudorapidity and energy loss through bremsstrahlung in the detector material. The energy scale in the same range of energies is measured with an uncertainty smaller than 0.1 (0.3)% in the barrel (endcap) region in proton-proton collisions and better than 1 (3)% in the barrel (endcap) region in heavy ion collisions. The timing resolution for electrons from Z boson decays with the full 2016–2018 proton-proton collision data set is measured to be 200 ps.
  • ArDM: first results from underground commissioning
    Item type: Journal Article
    Badertscher, Andreas; Bay, Francesca; Bourgeois, Nicolas; et al. (2013)
    Journal of Instrumentation
    The Argon Dark Matter experiment is a ton-scale double phase argon Time Projection Chamber designed for direct Dark Matter searches. It combines the detection of scintillation light together with the ionisation charge in order to discriminate the background (electron recoils) from the WIMP signals (nuclear recoils). After a successful operation on surface at CERN, the detector was recently installed in the underground Laboratorio Subterráneo de Canfranc, and the commissioning phase is ongoing. We describe the status of the installation and present first results from data collected underground with the detector filled with gas argon at room temperature.
  • Alignment of the CMS tracker with LHC and cosmic ray data
    Item type: Journal Article
    CMS Collaboration; Chatrchyan, Serguei; Bachmair, Felix; et al. (2014)
    Journal of Instrumentation
    The central component of the CMS detector is the largest silicon tracker ever built. The precise alignment of this complex device is a formidable challenge, and only achievable with a significant extension of the technologies routinely used for tracking detectors in the past. This article describes the full-scale alignment procedure as it is used during LHC operations. Among the specific features of the method are the simultaneous determination of up to 200 000 alignment parameters with tracks, the measurement of individual sensor curvature parameters, the control of systematic misalignment effects, and the implementation of the whole procedure in a multi-processor environment for high execution speed. Overall, the achieved statistical accuracy on the module alignment is found to be significantly better than 10μm.
  • The CMS Tracker Operation and Performance at the Magnet Test and Cosmic Challenge
    Item type: Journal Article
    Adam, W.; Bergauer, T.; Dragicevic, M.; et al. (2008)
    Journal of Instrumentation
  • Shutter-type multi-point optical alignment using a Structured Laser Beam in vacuum
    Item type: Journal Article
    Niewiem, Witold Grzegorz; Figura, Sebastian; Dusek, Martin; et al. (2025)
    Journal of Instrumentation
    This paper presents an alignment concept employing a Structured Laser Beam (SLB) for offset measurements over a 140 m distance. The prototype consists of an SLB generator and three measurement stations within a vacuum system. The Inner Core (IC) of the SLB establishes an optical axis that serves as a reference line. A comparative assessment is performed against a Wire Positioning System (WPS) and Hydrostatic Levelling System (HLS). Two independent measurements of the prototype show that it exhibits high relative precision, with a standard deviation of offset measurements below 20 μm. The acquisitions reveal that the prototype results are shifted relative to WPS-HLS measurements. This shift, observed in both transverse directions, can be attributed to the multi-stage fiducialisation process, which introduces additional uncertainty. This result can be improved by modifying the prototype design and the fiducialisation measurement method. The SLB-based prototype is a promising candidate for alignment applications in particle accelerators due to its high precision over long distances.
Publications 1 - 10 of 247