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about lip

Funded Projects / details

Cofinanciado por:

República Portuguesa 

C-ATLAS Upgrade 2021/23

Code CERN/FIS-PAR/0026/2021

Beneficiary Entity

LIP - Laboratório de Instrumentação e Física Experimental de Partículas

Project summary

The aim of this proposal is to support a strong Portuguese participation in the work towards the ATLAS [ATLAS-EXP] experiment upgrade for the High-Luminosity LHC phase (HL-LHC) [HL-LHC]. The work plan proposed in this project focuses on specific contributions to the ATLAS Phase II upgrade, to allow ATLAS to operate at luminosities up to 7.5 times above the LHC design. These activities are already well under way, initiated during a previous funded project, and our work has had an important impact in ATLAS. The requested funding will be crucial to fulfil our scientific goals as well as the Portuguese commitments to the experiment. The ATLAS Collaboration is currently finishing Phase I of the detector upgrade [ATLAS-UPG1]. Our contributions to Phase I have been successfully completed, and included the use of the TileCal outer cells in the muon trigger, to significantly reduce the muon reconstruction fake rate in poorly instrumented rapidity regions. A new physics run (Run 3) is due to start in 2022 and last for 3 years, already at 2.5 times the design LHC instantaneous luminosity. Funding for the operation and physics exploitation activities during Run 3 is requested in a different proposal. LIP is a founding member of the ATLAS Collaboration and has made crucial contributions to the TileCal calorimeter, the forward detectors and trigger/data acquisition (TDAQ) design, construction and commissioning. Our team members have/are occupying a number of roles of responsibility in the collaboration in areas where the group is involved, and the importance of our activities was recognized by the collaboration in awarding prizes for outstanding contributions to several group members. We continue to make leading contributions to the ATLAS TileCal and TDAQ. The respective Memoranda of Understanding (MoUs) for Phase II have been signed by the Minister of Science, and represent a very significant financial contribution by the Portuguese funding agency, FCT. This contribution, however, covers exclusively the construction costs of the final deliverables. It must be matched by the necessary funding to support the associated R&D and software development effort, including the required human resources, that will ensure the proper development, design, prototyping, and debugging of thenew systems and upgrades. The most important projects that we aim to continue from the previous funded project include the complete renewal of the TileCal hadronic calorimeter High Voltage distribution system (TileCal HV) [TILEUPG2], which is entirely under LIP’s responsibility, as well as fast event reconstruction in the TDAQ using graphical processors (GPUs) as hardware accelerators. Our detailed study of the ageing of TileCal optical components proved to be crucial to realize a potential problem with loss of scintillating light yield. This has impacted on the ATLAS strategy for TileCal PMT replacement but must be continued in thecurrent project. A new area of activity will be the R&D and construction of the new High Granularity Timing Detector (HGTD) [HGTD-TDR]. This is an important new addition to ATLAS, intended to mitigate the effects of a very high pileup rate. Its inclusion in the current work programme follows from a decision by the collaboration to abandon the Hardware Tracking for the Trigger (HTT) co-processor. The HTT was one of the new systems planned for the ATLAS upgrade, and one of the areas in which we have contributed in the last few years. It was abandoned after much debate and detailed studies, in favour of a software-only approach, made possible by very significant software improvements and tuning. The current proposal has long-term strategic value, both to the ATLAS team and to LIP as a whole. Part of this value comes from supporting our long-term involvement in the TileCal. Another part comes from exploring the application of commodity computing hardware accelerators, such as GPUs, to time-critical trigger software, which we believe will pay strong dividends. And finally, the creation or consolidation, at LIP, of capabilities to produce electronics and firmware for particle physics applications, is again of strategic importance for the future. Part of this work will therefore be carried out in close collaboration withthe LIP electronics laboratory, eCRLab, and Detector Laboratory. Complementing these hardware oriented activities, other crucial tasks in this project will focus on detailed studies of the radiation-induced ageing of TileCal fibres and scintillators, exploiting our core expertise, and on specific prospective physics analyses to make the most of the HL-LHC dataset. In summary, this project has four main lines of development: development of the new TileCal HV system, performance aspects of the TileCal (optics and use in muon trigger); the challenging new HGTD detector; and the ATLAS trigger, with open ended R&D on the application of GPUs to trigger processing; and prospective physics studies.

Support under

Reforçar a investigação, o desenvolvimento tecnológico e a inovação

Region of Intervention




Total eligible cost

€ 192672

EU financial support

€ 0.00

National public financial support

€ 192.672











Versão Extensa: Este trabalho é financiado por fundos nacionais através da FCT - Fundação para a Ciência e a Tecnologia, I.P., no âmbito do projeto CERN/FIS-PAR/0026/2021

Versão Resumida: OE,FCT-Portugal, CERN/FIS-PAR/0026/2021


GPU acceleration of the ATLAS calorimeter clustering algorithmInternational Conference Proceedingspublished
Upgrade of the ATLAS Tile Calorimeter high voltage systemArticle in international journal (with direct contribution from team)published


Oral presentation in international conference
Accelerating the ATLAS Trigger system with Graphical Processing UnitsStudent presentation in advanced training event
Accelerating the ATLAS Trigger System with Graphical Processing UnitsOral presentation in national or international meeting
Accelerating the ATLAS Trigger system with Graphical Processing UnitsStudent presentation in advanced training event
ATLAS and FCC Scintillator DetectorsPoster presentation in national or international meeting
ATLAS UpgradesPoster presentation in national or international meeting
Control System of Upgraded High Voltage for Atlas Tile Calorimeter Poster presentation in international conference
Radiation damage of the optical components in Scintillator Detectors: from the ATLAS/LHC Tile Calorimeter to future experimentsStudent presentation in advanced training event
Radiation damage of Tile Calorimeter optical componentsPoster presentation in national or international meeting
Radiation Hardness of Plastic Scintillating Material for Scintillador CalorimetersStudent presentation in advanced training event


Accelerating the ATLAS Trigger system with Graphical Processing Units
Controlo Digital e Nova Electrónica para o Banco de Testes para o Sistema de Alta Tensão dos Fotomultiplicadores do Tilecal
Development of GPU-based Calorimeter Clustering algorithms for the ATLAS Upgrade
High Voltage filters for the High Granularity Timing Detector of the ATLAS Experiment
Interlock electronics for the high Granularity Timing Detector od the ATLAS
Machine Learning for Anomaly Detection in the Atlas Trigger at the LHC
Performance of the TileCal High Voltage Upgrade System
Prospects for the HL-LHC of the measurement of the top quark couplings in the ttbar semileptonic channel
Radiation Damage of Optical Components in Scintillator Detectors: from the ATLAS/LHC Tile Calorimeter to Future Experiments
Study of the CP properties of the Higgs coupling to top quarks with ATLAS at the LHC.


Agostinho da Silva Gomes
Amélia Arminda Teixeira Maio
Ana Luísa Moreira de Carvalho
André Filipe Arranca Menezes Trigueiros da Silva
André João Mauricio Leitão do Valle Wemans
António Francisco Brigas Caramelo
António Joaquim Onofre de Abreu Ribeiro Gonçalves
António Manuel da Silva Pina
Beatriz Catarina Pinheiro Pereira
Bruna Filipa Couto Lima
Catarina José Ponte Pereira
Filipe Manuel Pedro Martins
Filipe Mendes de Oliveira Cuim
Guiomar Gaspar de Andrade Evans
Helena de Fátima Nunes Casimiro dos Santos
João Carlos Macário Ribeiro
João Gentil Mendes Saraiva
José António Soares Augusto
José Carlos Rufino Amaro
José Ricardo Morais Silva Gonçalo
Luis Felipe Falda de Ulhoa Coelho
Luís Miguel da Silva Gurriana
Maria Miguel de Moura Pinheiro da Cruz
Miguel João do Nascimento Alves
Nuno dos Santos Fernandes
Patricia Conde Muíño
Patrícia Gaspar Ferreira
Pedro Miguel Mendes Amaral Torres Lagarelhos
Rudnei Machado
Rui Fernandez
Rui Miguel Fernandes Marques
Rute Costa Batalha Pedro
Susana Sério
Tiago Miguel Prates da Costa