New storage and data access solution for CMS experiment in Spain towards HL-LHC era

Dengra, C. Perez; Molina, José Flix; Barcelona, Anna Sikora

doi:10.1088/1742-6596/2438/1/012053

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…Our previous re-1 HEP-SPEC06 (HS06) [12] is a widely employed benchmarking CPU metric in WLCG. search [13] demonstrated that MINIAOD files accessed by users' analysis jobs are identified as the most appropriate files to be stored in a cache. The MINIAOD data tier analysis format contains only relevant reconstructed physics object information for faster processing and quick analysis, being the most frequently used data format when performing final analyses for publications.…”

Section: Controlled Submission Of Analysis Jobs Accessing Miniaod Filesmentioning

confidence: 99%

A case study of content delivery networks for the CMS ex-periment

Acosta-Silva,

Casals,

Delgado Peris

et al. 2024

EPJ Web of Conf.

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In 2029 the LHC will start the high-luminosity LHC program, with a boost in the integrated luminosity resulting in an unprecedented amount of ex- perimental and simulated data samples to be transferred, processed and stored in disk and tape systems across the worldwide LHC computing Grid. Content de- livery network solutions are being explored with the purposes of improving the performance of the compute tasks reading input data via the wide area network, and also to provide a mechanism for cost-effective deployment of lightweight storage systems supporting traditional or opportunistic compute resources. In this contribution we study the benefits of applying cache solutions for the CMS experiment, in particular the configuration and deployment of XCache serving data to two Spanish WLCG sites supporting CMS: the Tier-1 site at PIC and the Tier-2 site at CIEMAT. The deployment and configuration of the system and the developed monitoring tools will be shown, as well as data popularity studies in relation to the optimization of the cache configuration, the effects on CPU efficiency improvements for analysis tasks, and the cost benefits and impact of including this solution in the region.

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Section: Controlled Submission Of Analysis Jobs Accessing Miniaod Filesmentioning

confidence: 99%

A case study of content delivery networks for the CMS ex-periment

Acosta-Silva,

Casals,

Delgado Peris

et al. 2024

EPJ Web of Conf.

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“…Consequently, exceeding the heat load on the system, generating undesired conditions and distorting the beam dynamics thereby limiting the performance of the LHC [3,7]. With an increase in energy expected from the High-Luminosity upgrade [8,9], electron cloud formation will be more sensitive to SEE. This makes reducing the SEY of exposed surfaces near to unity more critical.…”

Section: Introductionmentioning

confidence: 99%

Modelling laser modified secondary electron yield response of surfaces

Din,

Uren,

Wackerow

et al. 2024

J. Phys. D: Appl. Phys.

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Electron clouds hinder the operation of particle accelerators. In the Large Hadron Collider (LHC), the copper beam screens are located within close proximity to the beam path, resulting in beam-induced electron multipacting, which is the main source of electron cloud formation. Conditions for multipacting are encountered when such surfaces have a secondary electron yield (SEY) greater than unity. Roughening the surface through laser processing offers an effective solution for reducing secondary electrons. Laser ablation leaves behind a complex rough, multi-scale geometrical surface with an altered chemical composition. Current models often over-simplify the geometry, do not have sufficient experimental data to derive input parameters, and exclude SEY-reducing mechanisms such as the surface chemistry. Leading to electron-matter interactions which do not resemble that of a real surface. Here, this complex surface is studied on copper used in the LHC, and the influence of microgeometry, inhomogeneous nanostructure and complex surface chemistry on the SEY is investigated. A novel, improved model is proposed that characterises these sophisticated structures, enabling the efficient design of surfaces to reduce SEY. To validate the model, samples were made using a variety of laser parameters. Modelling insights revealed that secondary electron suppression is not only caused by the microgeometry but also the nanostructure and chemical modification play a role. Contrary to the conventional theory, high aspect ratio structures are not necessarily required for effective SEY reduction. Currently, the model is applicable to a variety of surface morphologies and could be employed for other materials.

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Research on the organization of public space relations in commercial complex buildings in the context of big data

Zheng,

et al. 2023

Applied Mathematics and Nonlinear Sciences

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As an emerging type of large commercial building, commercial complexes play an increasingly important role in contemporary urban development and construction trends. In order to better study the organization of public space relations in commercial complex buildings, this paper selects eight commercial complexes as sample cases to analyze their spatial design in terms of both content public space and external public space based on big data technology. Regarding the design of the commercial complexes’ internal public space movement, the highest accessibility degree reached 95.3%, while the average was 82.5%. Regarding visibility, the highest level was 96.0%, and the average was 83.3%. For large complexes, better spatial relationships can be designed to improve the circulation degree and thus enhance customers’ consumption experience. Regarding the convenience of traffic connection to the external space of commercial complexes, an average of 41.4% of customers consider it very convenient, 23.1% consider it relatively convenient, 27.9% consider it somewhat inconvenient, and 18.0% consider it very inconvenient. Commercial complexes can effectively attract more repeat customers if they can improve the convenient design of transportation connections. The study of public relations of commercial complexes based on big data helps to discover the defects of their public space design and plays a significant role in optimizing spatial design and relationship organization and strengthening their integrated functions.

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New storage and data access solution for CMS experiment in Spain towards HL-LHC era

Cited by 3 publications

References 6 publications

A case study of content delivery networks for the CMS ex-periment

A case study of content delivery networks for the CMS ex-periment

Modelling laser modified secondary electron yield response of surfaces

Research on the organization of public space relations in commercial complex buildings in the context of big data

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