Plans for the Phase II upgrade to the ATLAS detector

Abstract

CERN has planned a series of upgrades for the Large Hadron Collider (LHC). The last in this current series of planned upgrades is designated the High Luminosity LHC (HL-LHC) and as the name suggests will bring the Luminosity up to 5 × 10 34 cm −2 s −1 . The ATLAS detector will be extensively changed to meet the challenges of this upgrade (termed the "Phase II" upgrade). There are many systems that require modification in this regime, but this paper focuses on the subsystems requiring the most radical changes.The ATLAS inner tracker is being completely rebuilt for Phase II. The TRT is removed in favor of an all-new all-silicon tracker. The changes to the pixel system, barrel and end-cap strip detectors are explained. In addition, the muon detector will be modified and the muon and electron triggers will be modified to include tracking regions of interest and to improve muon resolution. In this way trigger rates can be brought under control while maintaining constant trigger thresholds. KEYWORDS: Particle tracking detectors (Solid-state detectors); Muon spectrometers; Trigger concepts and systems (hardware and software) 1 For the ATLAS collaboration.

Study of residual artificial neural network for particle identification in the CEPC high-granularity calorimeter prototype

“…However, it is important to note that the geometry of detectors is not universally confined to cubic structures with fixed tile sizes. For example, detectors utilized in collider experiments, both existing and future ones [40][41][42][43], often adopt a barrel-like configuration with variable tile sizes, to maximize the chances of detecting particles produced in the collision. The upgraded design of the AHCAL in the future would probably not be limited to a fixed tile size as well.…”

Down type iso-singlet quarks at the HL-LHC and FCC-hh

“…The muon system will be extended with new chambers in the forward region, bringing the coverage up to |η| = 2.8. Additionally, both ATLAS and CMS envisage adding timing detectors to provide the capability of adding timing information to reconstruction [10][11][12][13][14][15][16].…”

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“…The High Luminosity Large Hadron Collider (HL-LHC) is expected to begin operation in 2026 [1] with a design instantaneous luminosity of 5 × 10 34 cm −2 s −1 . The ATLAS detector, including Inner Tracker (ITk) [2], will be upgraded (Phase-II) [3,4] accordingly. In the ATLAS ITk pixel upgrade, each pixel module has a pixel sensor and two or four RD53B chips [5][6][7] in parallel.…”