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General Machine Timing System at GSI and FAIR

whiterabbit logo.png

The FAIR facility involves a long chain of accelerators which need to be tightly synchronized. This is achieved by the General Machine Timing (GMT) system, a distributed event generation system based on the notion of time. Time synchronization is achieved by using White Rabbit (WR), a fully deterministic Ethernet-based field bus for clock transfer and synchronization. The key components of the GMT are a so-called Data Master (DM) that schedules actions by broadcasting messages, a WR network and Timing Receiver (TR) nodes executing machine relevant actions on time.

The primary tasks of the timing system are the following.
  • Time-Synchronization of ~2000 - 3000 nodes with sub-ns accuracy over fiber lengths of up to 2 km.
  • Distribution of TAI counters with ns accuracy.
  • Generation of timing events for synchronization of equipment.

About...

The aim of this timing web is to provide an overview on the timing system and its relationship to other systems. Moreover, it is the central point for documentation. Please note, that the timing system is still under development.

Topics

Announcements

Scheduled downtime of the GMT production system as agreed with operations are marked with bold letters.

GMT-schedule.png
Figure: Schedule for the next weeks based on shutdown planning. For an overview, click here or here.

News

  • 09 May 2022
    • user beam-time
  • 02 May 2022
    • machine experiments
  • 25 April 2022
    • beam commissioning starts
  • 19 April 2022
    • operator training ends
    • maintenance break
  • 16 April 2022
    • first part of beam time ends
    • operator training til Monday
  • 05 March 2022
    • restart Data Master
  • 01 February 2022
    • user beam-time starts!
  • 28 January 2022
    • beam commissioning starts
    • beam extracted from SIS18
  • 24 January 2022
    • maintenance window open and closed
  • 21 January 2022
    • dry-run ends
  • 17 January 2022
    • dry-run starts
  • 22 December 2021
    • more tests with 'booster mode'
    • -> good transfer timing from UNILAC to SIS18 can be achieved with an efficiency exceeding 98% (click)
  • 16 December 2021
    • maintenance window closed
  • 15 December 2021
    • maintenance window open
  • 03 December 2021
    • dry-run ends
    • we had two weeks of smooth GMT operation
  • 23 November 2021
    • booster mode
      • for the first time, the so-called booster mode has been demonstrated (dry-beam)
      • dry-beam is injected, accelerated and extracted from SIS18 with a repetition rate of 2.7 Hz
      • the key challenge is tight synchronization of SIS18 and the 50 Hz machine UNILAC at this high rate
  • 22 November 2021
    • dry-run starts
    • new handshake mechanism Data Master <-> UNILAC Pulszentrale successfully established
  • 05 November 2021
    • maintenance window closed
  • 03 November 2021
  • 01 November 2021
    • maintenance window starts (full week)
  • Older News

GSI Timing Team

-- DietrichBeck - 7 February 2021

Topic attachments
I Attachment Action SizeSorted ascending Date Who Comment
GMT-schedule.pngpng GMT-schedule.png manage 35 K 21 Apr 2022 - 11:06 DietrichBeck another plan for the next weeks ...
Topic revision: r404 - 10 May 2022, DietrichBeck
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