Bunch-to-Bucket Transfer System

b2b logo.png

This work package was frozen due to missing or redirected personnel for about two years

The purpose of the Bunch-to-Bucket (B2B) transfer system is to transfer ion beams over the whole range of isotopes from one ring to another at GSI and FAIR. It employs the so-called phase-shift or frequency beating methods to achieve a phase match between bunch and bucket to better than 1 degree. The Bunch-to-Bucket (B2B) Transfer System is essential and indispensable for the FAIR accelerator chain. Without, no beam can be transferred from SIS18 to SIS100 and to follow-up machines. The B2B system is realized by the General Machine Timing (GMT) system and the Low-Level RF (LLRF) system. The B2B system is closely linked to other systems like kicker control and electronics as well as the machine protection system.


The aim of this web is to provide an overview on the Bunch-to-Bucket transfer system and its relationship to other systems. Moreover, it is the central point for documentation. Please note, that the B2B transfer system is still under development.



  • till 30-Jun-2021: proof-of-principle experiments
    • 'bunch 2 extraction' SIS18, ESR to dump or some beamline
    • 'bunch 2 extraction' SIS18 -> PHELIX
    • 'bunch 2 coasting beam' SIS18 -> ESR
    • 'bunch 2 bucket' SIS18 -> ESR


  • 13-Apr-2021:
    • 'dry test' with SIS18 extraction kicker (just to confirm things work)
    • test with new Group DDS at SIS18
  • February 2021:
    • dry operation in parallel to beam time
    • see results
  • 15-Jan-2021: 'dry run'
    • bunch-2-bucket SIS18 -> ESR
    • comfortable command line interfaces for control and monitoring
    • see results
  • 05-Dec-2020: new page on B2B lite, setup, results
  • 27-Nov-2020: 'dry run'
    • phase matched extraction from SIS18
    • 'bunch to coasting dry beam ' transfer from SIS18 to ESR
    • see results
  • 26-Nov-2020: phase-matched extraction from ESR (with 'dry beam')
  • 23-Nov-2020: for the first time, the B2B system triggers the ESR kicker successfully!
  • 18-Nov-2020: for the first time, the B2B system triggers the SIS18 extraction kicker successfully!
  • 23-Dec-2019: proof-of-principle phase matching (using frequency beats) in RF supply room, see here
  • 12-Jun-2019: proof-of-principle phase matching (using frequency beats) on office table, see here


BunchBucket Web Utilities

-- DietrichBeck - 22 January 2021
Topic attachments
I Attachment Action Size Date Who Comment
b2b_logo.pngpng b2b_logo.png manage 22 K 17 Oct 2020 - 11:03 DietrichBeck first unofficial logo with transparent background
Topic revision: r21 - 13 Apr 2021, DietrichBeck
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