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CERN Tape Archive Workshop : CTA 2025
No full textCTA software development is primarily driven by the needs of the CERN experimental programme. Looking beyond Run-3, data rates are set to continue to rise exponentially into Run-4 and beyond. The CTA team are planning how to scale the software and service to meet these new challenges.
CTA is also driven by the needs of the community outside CERN. The landscape of tape archival for scientific data is consolidating, and CTA is constantly adapting to a wider range of use cases.
This talk will present the short-term and medium-term roadmap for CTA development and new features
Recent Experience with the CMS Data Management System
No full textThe CMS experiment manages a large-scale data infrastructure, currently handling over 200 PB of disk and 500 PB of tape storage and transferring more than 1 PB of data per day on average between various WLCG sites. Utilizing Rucio for high-level data management, FTS for data transfers, and a variety of storage and network technologies at the sites, CMS confronts inevitable challenges due to the system's growing scale and evolving nature. Key challenges include managing transfer and storage failures, optimizing data distribution across different storages based on production and analysis needs, implementing necessary technology upgrades and migrations, and efficiently handling user requests. The data management team has established comprehensive monitoring to supervise this system and has successfully addressed many of these challenges. The team's efforts aim to ensure data availability and protection, minimize failures and manual interventions, maximize transfer throughput and resource utilization, and provide reliable user support. This paper details the operational experience of CMS with its data management system in recent years, focusing on the encountered challenges, the effective strategies employed to overcome them and the ongoing challenges as we prepare for future demands
LHCb RICH Fast-timing photon detection at the SPS charged particle beam
No full textThe use of a new optoelectronic readout chain with (100)ps time resolution is a major milestone in thedevelopment of RICH detectors for environments with a high number ofparticle interactions per bunch crossing, such as theHigh-Luminosity LHC. A prototype chain, based on MAPMT and SiPMphoton sensors coupled to readout electronics integrating the FastICASIC and a TDC-in-FPGA, is presented. The FastIC is an 8-channelASIC for analogue-to-digital conversion with 25 ps timeresolution. This ASIC is the predecessor of the FastRICH ASIC forthe LHCb RICH upgrades. The signals from the photon detectors aretimestamped in a custom multi-channel TDC-in-FPGA designed using amulti-phase clock sampling architecture with an average bin width of150 ps. The prototype optoelectronic readout chain was tested in acharged particle beam of 180 GeV/c hadrons at the CERN SPSfacility. The reference time-of-arrival of the particle tracks wasmeasured with about 100 ps time resolution and the number of tracksper event was registered using a particle tracking system. Thesingle-photon time resolution of the MAPMT sensors is extractedusing a binned method in order to correct for the calibrated TDC binwidths and detector time-walk. The resulting best estimate of σ = 182 ± 24 ps is in agreement with pulsed-laser measurementsin the lab and consistent with the expectations from themanufacturer.Abstract
The use of a new optoelectronic readout chain with
(100)ps time resolution is a major milestone in the
development of RICH detectors for environments with a high number of
particle interactions per bunch crossing, such as the
High-Luminosity LHC. A prototype chain, based on MAPMT and SiPM
photon sensors coupled to readout electronics integrating the FastIC
ASIC and a TDC-in-FPGA, is presented. The FastIC is an 8-channel
ASIC for analogue-to-digital conversion with 25 ps time
resolution. This ASIC is the predecessor of the FastRICH ASIC for
the LHCb RICH upgrades. The signals from the photon detectors are
timestamped in a custom multi-channel TDC-in-FPGA designed using a
multi-phase clock sampling architecture with an average bin width of
150 ps. The prototype optoelectronic readout chain was tested in a
charged particle beam of 180 GeV/c hadrons at the CERN SPS
facility. The reference time-of-arrival of the particle tracks was
measured with about 100 ps time resolution and the number of tracks
per event was registered using a particle tracking system. The
single-photon time resolution of the MAPMT sensors is extracted
using a binned method in order to correct for the calibrated TDC bin
widths and detector time-walk. The resulting best estimate of
σ = 182 ± 24 ps is in agreement with pulsed-laser measurements
in the lab and consistent with the expectations from the
manufacturer
HL-LHC TDE Preliminary Design Review
No full textA new Target Dumps External (TDE) design, compatible with HL-LHC beam parameters, has been developed for the HL-LHC. In this Design Review (DR), the design that has been developed to meet the requirements of HL will be presented in detail. The maturity of the design in each area is dependent on the subsequent timescales for procurement and implementation. In the areas of the core and vessel, the design will be fully defined, and this will act essentially as a manufacturing readiness review. In other areas, such as the cooling system, this will act as a preliminary design review as there may still be further refinements and detailed design aspects to develop
CMS searches for new physics in the Higgs sector
No full textA summary is presented of CMS searches for new neutral resonances, with main focus on scalars and pseudoscalars, based on data collected during Run 2 of the LHC. Special emphasis is given to the most recent results
Silicon Photonics Circuits for the optical readout of CERN detectors
No full textThe increasing luminosity in CERN experiments, enabled by future upgrades, demands optical links with enhanced bandwidth and radiation tolerance. Silicon Photonics (SiPh) has emerged as the optoelectronic technology meeting these requirements and is being considered for the next generation of optical readout systems for CERN detectors. This paper presents the measurement results from photonic circuits integrated into a test chip designed at CERN, along with the progress on the system aspects of SiPh radiation-tolerant optical links
Evaluation of efficiency, radiation hardness, and timing performance of the Analogue Pixel Test Structure for ALICE ITS3
No full textA replacement of the three innermost layers of the new ALICE Inner Tracking System (ITS2), referred to as ITS3, is planned for the LHC Long Shutdown 3 (2026–2028) to further enhance tracking precision and efficiency. The ITS3 is designed as a cylindrically bent silicon vertex detector, utilizing stitched, wafer-scale sensors developed with the Tower Partners Semiconductor Co. 65 nm technology. The feasibility of this technology for ITS3 was evaluated using prototypes fabricated in the initial multi-reticle-layer run. This contribution presents the latest sensor characterization results from the analogue pixel test structures, focusing on detection efficiency, timing response, and radiation hardness