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Session 3 – Injection CONSIDERATIONS FOR 2012. Alick Macpherson Malika Meddahi S peakers : Lene Drosdal Wolfgang Bartmann Karel Cornelis Chiara Bracco. Beam preparation in the injectors- Considerations for 2012.

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Session 3 injection considerations for 2012

Session 3 – InjectionCONSIDERATIONS FOR 2012

Alick Macpherson

Malika Meddahi



Wolfgang Bartmann

Karel Cornelis

Chiara Bracco

Beam preparation in the injectors considerations for 2012
Beam preparation in the injectors- Considerations for 2012

  • Produce a list of nominal beam parameters in the injector chain and sick to it for regular physics operation;

    • Immediate gain: intelligent use of SPS scraping and no more stretched beam parameter requests

  • Decide on the SPS super cycle composition when filling LHC and stick to it:

    • 1 (or 2?) CNGS cycle(s) + LHC cycle (27 s to 33s cycle) – advantage: less time spent at LHC flat bottom (reduce emittance blow up) while compromising ZS sparks with high intensity

    • Accept the drawback : take FT cycle out so impact on PS users;

  • Agree on the strategy: Pilot - then steering of TL with12b – then 4x36b checks in the SPS (15’) – then filling for physics with NO more changes in PSB and PS.

  • To note:

    • improvement: no more sequence changes in the SPS injectors (from 12b to 36b)!

    • ZS limitations - maybe need more resources on 2012 investigations

Injection considerations for 2012
Injection -Considerations for 2012


  • Studies on TL stability (Lene + Verena) for fewer TL beam steering

    Give early SPS beam time for MSE4/6 and MKE4 (G. Le Godec + ABT)

  • Improving tools

    • IQC - trajectory at collimators, envelopes for monitors and correctors, intensity dependent and thus easy colour code

    • Transverse diagnostics in the injector chain

  • Mitigation and cure campaigns concerning beam losses and protection (shielding, BLM sunglasses, moving/adding TCDIs)

  • Dedicated beam time for injection and beam dump systems w/wo beam to properly test components (new electronics, SW, FW....) and set up (collimators, IQC references for steering...)

  • Respect safety instructions (Experiments off during injection, MKI vacuum and temperature interlocks)

Injection summary
Injection - summary

  • Beam preparation in the injectors – agree on beam parameters and strategy …. and document them

  • Beam transfer and injection

    • Reducing the beam losses : Tracking the culprits of the instability observed and curing the problems;

    • Protection against beam losses and potential damages: Mitigation and new measures being put in places;

    • All in place to not reproduce the problems encountered with the HW and SW during 2011

    • Beam time needed as soon as the machine restart to re-commission and set-up the injection and beam dump systems.