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VT Technology study for CTA

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General project information

Leader: Claudio Vuerli, INAF, Italy.

  • Administrative support for the VT project will be provided by Richard McLennan (User Community Support Officer,
  • Gergely Sipos will be responsible for the delivery of technical activities from the EGI side (Technical Outreach Manager,

Mailing list:
Status: Finished
Start date: 7. January 2013.
End date: 31. December 2013.
Meetings: Normally as a teleconference via Webex. The 1st teleconference meeting has been scheduled for Friday, 18 January 2013 from 14:30 to 16:00 (Europe/Amsterdam).
Look at meetings schedule: File:CTA-VT-schedule.pdf

See all the meetings in Indico:

Project Initiation document: File:EGI-CTA-VT-v1.0.pdf


The Cherenkov Telescope Array (CTA) is one of the ESFRI projects of the Astronomy & Astrophysics community. The CTA project is an initiative to build the next generation ground-based very high energy γ-ray instrument. It will serve as an open observatory to a wide astrophysics community and will provide a deep insight into the non-thermal high-energy universe. The CTA will be extremely challenging for what concerns computing and data storage resources; for this reason the use of Distributed Computing Infrastructures (DCIs) is one of the possible options that could be taken into consideration in defining and implementing the computing model of CTA. It is worth noting however that the CTA project has not taken a final decision up to now about which computing model to use. Activities in this area are currently in progress within the preparatory phase of CTA and within its partner DCIs. However the EGI grid infrastructure is already exploited by the CTA project for the production and analysis of Monte Carlo simulated data within a dedicated CTA VO. This VO is supported by about 20 computing centers in Europe. The proposed EGI VT project aims to explore and investigate potential solutions to the computing and data access issues within the computing models under investigation for the CTA observatory. In particular two technical areas will be investigated: science gateway portals and federated SSO access protocols. It is worth to underline that VT project itself and its outcome will not imply any obligation for the CTA consortium. For sure, CTA remains the key project for high-energy astrophysics in the forthcoming years with a natural aggregation capability for an entire branch of the astrophysical research; the adoption of DCIs to process data acquired through the CTA arrays could therefore be a significant step forward for the wide adoption of DCIs by the entire A&A community. In summary, the overall aim of the proposed VT project is:

“To investigate, identify and assess portal and SSO access models that may contribute to the CTA computing solutions in order to provide factually based recommendations for the way forward.” Results of this project will be shared with the principal stakeholder(s) (the CTA project).


The outcomes will be delivered prior to the CTA consortium Data Management coordinator (Giovanni Lamanna) and their publication will require his approval. If the technological solutions proposed in the outcome documents meet the needs and requirements of the CTA project they will be used to achieve the scientific and technological objectives of CTA. It is expected that these outcomes will be general enough to be re-used or taken in consideration in other astroparticle and astrophysics observatory related projects.

Task Outcome of outcome Means of delivery Link to outcome Expected time of delivery (after VT start) Updates & comments
Task 1 Social network between CTA members and EGI members (from and the NGIs)
  • The list of CTA – EGI connections are listed on the VT project Wiki page.
  • Information about CTA members is recorded in the EGI CRM system.
0.5 months (21 Jan) Task needs more time and runs as long as Task 2. Data gathered in a Google spreadsheet first, will be entered into CRM later.
Task 2 Documented CTA requirements concerning scientific gateways and an SSO system. Link to public document: 3 months (7 Apr)
  • The guidelines for the requirements gathering process
Task 3 Most suitable solutions from EGI and its partners that are capable to address the CTA requirements. Identified gaps in the EGI science gateways and SSO offerings to address CTA requirements.
  • Document (approved by the CTA consortium)¬ that is publicly accessible in the EGI Document Database.
5 months (7 June)
Task 4 Final report that proposes a roadmap for CTA and EGI to setup scientific gateways and an SSO solution for the CTA community.
  • Document (approved by the CTA consortium) that is publicly accessible in the EGI Document Database. 19 Sep 2013


N Topic Estimated Length Leader
1 Establish a social network between CTA and EGI through the support teams of the National Grid Infrastructures. 0.5 months Claudio Vuerli
2 Use the social network to gather CTA user requirements concerning:
  • Web based scientific gateways operated for the CTA community, making DCI resources and services from the NGIs accessible for CTA members;
  • A Single Sign On (SSO) authentication, internationally federated, mechanism that would make web-based scientific gateways accessible for the CTA community.
2.5 months Nadine Neyroud
3 Mapping the identified CTA requirements to solutions that exist within the EGI community and within its partners, such as the NRENs. 2 months Gergely Sipos
4 Document the findings and define a roadmap for implementing, deploying and operating an SSO solution and one or more scientific gateways for the CTA community. 1 month Claudio Vuerli

Besides the non-technical work (topics 1 and 4) the VT focuses on two technical areas – SSO and web based scientific gateways and portals (topics 2 and 3). These two topics are key contributors to lower the barrier of DCI access:

  • Web-based Science Gateways are community-specific set of tools, applications, and data collections that are integrated together via a web portal, providing access to resources and services from a distributed computing infrastructure. These gateways can support a variety of capabilities including workflows handling, virtualization of software and hardware, visualization as well as resource discovery, job execution services, access to data collections, applications and tools for data analysis. A science gateway enables community members to define and perform custom research scenarios or other types of use cases.
  • Single Sign On solutions simplify access control to multiple related, but independent software systems. Through SSO a user logs in once and gains access to all systems he/she needs to carry out activities without being prompted to log in again at each of them. SSO solutions can be relevant for the human and automated workflows of CTA that need to use software, data and resources from multiple systems.

The EGI community has experience and knowledge in both of these areas and this can be leveraged for CTA through this VT:

  • Several NGIs, and EGI partner projects (e.g. SCI-BUS ) develop and operate web based science gateways for scientific communities. These gateways and their enabling technologies are listed on a dedicated section of the EGI Website and could be leveraged for CTA gateways.
  • A currently running EGI VT will produce a "Science Gateway Primer" , a comprehensive document that collects information about technologies, policies, solutions that exist from the EGI community for gateway developers. These documented technologies, policies and solutions can be leveraged for CTA gateways.
  • EGI works in partnership with the National Research and Education Network (NREN) . Many of the NREN members operate national identity federations and these federations could be leveraged for an SSO for CTA.
  • EGI works in partnership with TERENA which participates in the GÉANT Service, eduGAIN , a service that connects NREN national federations into an inter-federation and which could be leveraged for the setup of an SSO for CTA.
  • The Czech NGI operates a Single Sign On system on behalf of for the whole EGI community. This system and the experience of the Czech NGI in setting up similar systems could be leveraged for an SSO for CTA.


Email if you wish to join! An EGI SSO account is required. Setup one at

Clustering of the VT members by Country and by activity within the VT: File:VT-membership-clustering.pdf

Project leader:

  • Claudio Vuerli (, INAF, Italy contacts:

  • Gergely Sipos (,, Netherlands
  • Richard McLennan (,, Netherlands

Other members:

  • Armenia:
    • National Academy of Sciences of the Republic of Armenia
      • Hrachya Astsatryan
  • Bulgaria:
    • Bulgarian Academy of Sciences, Institute of Information and Communication Technologies
      • Aneta Karaivanova, Todor Gurov
  • France:
    • CNRS/IN2P3/LAPP, Annecy
      • Giovanni Lamanna, Nadine Neyroud, Cecile Barbier, Nukri Komin
    • CNRS/Institut des Grilles
      • Genevieve Romier
  • Italy:
    • INAF
      • Claudio Vuerli, Ugo Becciani, Alessandro Costa, Fabio Vitello, Giuliano Castelli
    • INFN
      • Marco Bencivenni
    • IGI
      • Daniele Cesini, Alessandro Costantini, Marco Bencivenni
  • Lithuania:
    • Vilnius University, Faculty of Mathematics and Informatics
      • Viktor Kisko
  • Poland:
    • Cyfronet
      • Mariusz Sterzel
      • Joanna Kocot
  • Spain:
    • University of Barcelona/ICC, Barcelona
      • Ricardo Graciani
    • Ibergrid
      • Enol Fernandez, Isabel Campos
    • Hungary
      • Peter Kacsuk


  • Terena institute, Netherlands:
    • Brook Schofield, Licia Florio, Nadia Sluer
  • SWITCH, Switzerland:
    • Lukas Hämmerle

Additional information

The CTA Consortium consists of over 1000 members working in 27 countries:
List of members of the CTA Consortium

Return to VT Projects