The magic experiment



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tarix03.08.2018
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The MAGIC experiment

    • The MAGIC experiment
    • The data center
    • Migration to Grid
    • Tools for users


Scientific targets

  • Scientific targets

  • Cosmic Accelerators

    • AGN, PWN, SNR, GRB …
  • Fundamental Questions

    • Dark Matter, Cosmic Rays, Quantum Gravity, Cosmology …


  • The MAGIC collaboration:

    • 21 institutes (mostly in Europe)
    • ~ 200 members
  • Telescope site in Canary Islands

    • Observatorio Roque de los Muchachos
  • MAGIC-I: operating since 2004

  • MAGIC-II: in commissioning (2009)



Discovery of 10 new VHE g-ray sources

  • Discovery of 10 new VHE g-ray sources

  • New populations unveiled

  • Detection of distant VHE g-rays

  • Observation of GRB in prompt emission

  • Test on Lorentz Invariance (QG effects)

  • > 40 papers in high impact journals

    • Including 4 in Science magazine


MAGIC VO started in 2004

  • MAGIC VO started in 2004

    • Initiative by H. Kornmayer et al.
    • 1st A&A project with PLANCK
  • Initial project: 2 main areas

    • Monte Carlo production
    • Data storage and reduction
  • Operations:

    • 2004-06: no manpower
    • 2007-08: activity resumed
      • MC: UCM, Dortmund, INSA
      • Data Center: IFAE and PIC


The MAGIC data center is hosted at PIC

  • The MAGIC data center is hosted at PIC

    • Started in 2006 as a “classic” data center
    • Joint project: IFAE, UAB, UCM & IAA
    • Stores ~300 TB/year of raw data
  • The MAGIC data center at PIC provides:

    • Data transfer La Palma -> Barcelona
    • Data storage
    • Official data reduction
    • Data access for the collaboration
    • Resources and tools for users’ analysis (*)
    • Publish data to the Virtual Observatory (*)
    • (*) In preparation


The data center services are being migrated to Grid

  • The data center services are being migrated to Grid

    • While the data center is in production
    • Still a centralized data center
    • + Give access to computing for users’ private analysis
  • Services to be published

  • Requirements from the experiment

    • Make sure no features are lost
    • Data access without certificate
    • Overall, a soft transition


Grid is not kind to new users

  • Grid is not kind to new users

    • CLI tools are complex and not very user-friendly
    • Optimal data access and workflows need experience
  • For specific VO users most of the complexity can be hidden

    • Wrapper CLI tools with familiar look & feel
    • Graphical interface to access most common features
    • Set of workflow templates for parameter-based jobs
    • CLI still available for power users
  • Learning curve can be significantly reduced

  • Better user support if known, mature tools are used







A Gateway is in development

  • A Gateway is in development

  • Full security

    • Grid certificates, VOMS
    • User profiles: user, admin, public
  • Currently in design phase

    • Define modules
    • Platform: use existing tools?
    • Reusability: similar VOs in PIC


Users will not wait for the Gateway

  • Users will not wait for the Gateway

    • Two short-term solutions to soften the transition
  • Magicdoors

    • Web based data access to local SE
    • Based on httpdoors for dCache
    • Password authentication: no certificate needed (requirement)
  • Virtual-UI



The migration of the data to a Grid SE was effective in July

  • The migration of the data to a Grid SE was effective in July

    • Virtual UI and magicdoors are already in use
    • While MAGIC Gateway is in design
  • The migration is being soft enough

    • Only small issues which are being solved
    • Working close with IFAE magicians, ~ guinea pigs
    • Otherwise not much feedback… No news, good news!
  • Next challenge: opening the computing



The MAGIC data center is being migrated to the Grid

  • The MAGIC data center is being migrated to the Grid

    • All data is already published
    • Rest of services will follow soon
  • Tools are being developed for user-friendly use of Grid

    • A specific Gateway for MAGIC
    • Short term solutions while waiting for the Gateway
  • The migration is ongoing and successful so far

  • Thanks!




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