Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1'

874/1-011 (CERN)



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Ralph Steinhagen (CERN), Wolfgang Hofle (CERN)
This review focuses on transverse beam instability diagnostic systems, in particular the bunch-by-bunch feedbacks, intra-bunch (i.e. head-tail & TMCI) and Q/Q' diagnostics. The aim is to provide a first step in establishing a common understanding of what is needed, what could be useful for day-to-day operation, what could be delivered with the given resources, and to discuss and draft a recommendation of a targeted base-line after LS1.
Review Summary
  • Alexey Burov
  • Alick Macpherson
  • Andy Butterworth
  • Benoit Salvant
  • Chris Roderick
  • Daniel Valuch
  • Elias Metral
  • Erik Van Der Bij
  • Eugenia Hatziangeli
  • Frederic Dubouchet
  • Fritz Caspers
  • Gianluigi Arduini
  • Giovanni Rumolo
  • Giulia Papotti
  • Hannes Bartosik
  • Jean-Claude Bau
  • Jorg Wenninger
  • Katarina Sigerud
  • Laurette Ponce
  • Manfred Wendt
  • Marek Gasior
  • Nicolas Frank Mounet
  • Oliver Bruning
  • Ralph Steinhagen
  • Rhodri Jones
  • Riccardo De Maria
  • Roman Gorbonosov
  • Rossano Giachino
  • Tatiana Pieloni
  • Thibaut Lefevre
  • Werner Herr
  • Wolfgang Hofle
  • Xavier Buffat
    • 08:30 08:45
      Introduction and Mandate 15m
      Speaker: Wolfgang Hofle (CERN)
    • 08:45 09:15
      What could be useful after LS1 -- an OP perspective 30m
      Review of existing systems and how they could be better integrated to aid day-to-day machine operation and handling (online diagnostics, post-mortem, pre-analysis of which parameter to tune etc.). Impact of instabilities on machine operation and LHC luminosity performance.
      Speaker: Dr Jorg Wenninger (CERN)
    • 09:15 09:45
      What is needed after LS1 -- an ABP perspective 30m
      Review of transverse instabilities already observed and expected with operation at increased beam energy and intensities after LS1, and functional requirements on diagnostics systems to better understand and cure these instabilities. Impact of instabilities on machine operation and LHC luminosity performance.
      Speakers: Benoit Salvant (CERN), Dr Tatiana Pieloni (CERN)
    • 09:45 10:00
      discussion 15m
    • 10:00 10:15
      discussion - short coffee break 15m
    • 10:15 10:45
      What could be delivered -- RF 30m
      Summary of planned upgrades to the existing bunch-by-bunch feedback system for after LS1. Integration into Q/Q' diagnostic & FB infrastructure. Future options for after LS2. Required resources and time-line.
      Speaker: Dr Daniel Valuch (CERN)
    • 10:45 11:15
      What could be delivered -- BI 30m
      Status and limitations of existing intra-bunch diagnostics systems. Summary of the proof-of-concept tests performed with beam in 2012 and potential application after LS1. Potential upgrades after LS2. Required resources and time-line.
      Speaker: Dr Ralph Steinhagen (CERN)
    • 11:15 11:30
      Event Synchronisation and Logging Infrastructure - CO 15m
      Review options for synchronisation to propagate the information about an instability across the accelerator, the latency of the current mechanisms in the timing system.
      Speakers: Javier Serrano (CERN), Jean-Claude Bau (CERN)
    • 11:30 11:45
      Data storage, Post-processing and Visualisation Infrastructure - CO 15m
      Summary of the present system and upgrade plans during LS1 related to data storage, post-processing and visualisation infrastructure.
      Speaker: Chris Roderick (CERN)
    • 11:45 12:15
      discussion 30m
    • 12:15 14:00
      lunch break 1h 45m
    • 14:00 15:00
      Summary and Recommendation 1h
      round table with stake holders -- discussion and initial recommendation.
      Speaker: Gianluigi Arduini (CERN)