8th LHC Operations Evian Workshop

Session

Session 3: Injectors & Injection Process

13 Dec 2017, 09:40

Hotel Ermitage

Conveners

Session 3: Injectors & Injection Process

• Heiko Damerau (CERN)
• Matthew Alexander Fraser (CERN)

Session 3: Injectors & Injection Process

• Matthew Alexander Fraser (CERN)
• Heiko Damerau (CERN)

Presentation materials

Evian_Session3_Summary.zip

28. Overview of the beams from the injectors (15' + 5')

Alexandre Lasheen (CERN)

13/12/2017, 09:40

Abstract:
The injectors have delivered different beam types for luminosity production in the LHC during the 2017 run. Besides the nominal beam with 25 ns spacing and 72 bunch batches at PS extraction, the batch-compression-merging- splitting (BCMS) beam with multiples of 48 bunches at extraction from the SPS has been produced. The reduced number of bunches per batch from the PS is compensated...

29. Emittance preservation in the injectors (15' + 5')

Frank Tecker (CERN)

13/12/2017, 10:20

Abstract:
The emittance preservation of high brightness beams is crucial for obtaining the required future luminosities. A tight budget for the emittance degradation along the injector chain is thus necessary. The presentation will give an overview of 2017 emittance measurements with operational beams in the injector chain, and show possible emittance growth during the cycle and at the...

30. Time spent at injection (15' + 5')

Georges-Henry Hemelsoet (CERN)

13/12/2017, 10:40

Abstract:
Along the continuous optimization of the LHC cycle during the recent years, injection became more and more the beam mode where the biggest potential for reducing time and hence to increase the LHC luminosity production is foreseen. This contribution will outline the main actions done during this period and highlight the main periods where time could be gained. Further, it will look...

31. Hardware limitations at injection (15' + 5')

Vasileios Vlachodimitropoulos (CERN)

13/12/2017, 11:00

Abstract:
Hardware limitations due to the intercepting devices in the SPS, the SPS-to-LHC transfer lines and the LHC will be briefly reviewed with potential operation beam in mind for 2018. Heating issues in the LHC injection kicker magnet (MKI) are also a possible future limiting factor for LHC’s availability. Prior to LS1 one of the MKIs occasionally exhibited high temperatures leading to...

33. SPS and LHC batch spacing optimisation (15' + 5')

Francesco Maria Velotti (CERN)

13/12/2017, 11:20

Abstract:
In 2016, part of the luminosity performance improvement for the ion run could be achieved by reducing the PS batch spacing in the SPS. The same optimisation process was then applied to proton beams resulting in the reduction of both SPS and LHC batch spacing in 2017 operation, i.e. to 200 and 800 ns respectively. In this contribution, the operation with and evolution of the new...

34. AGK and Abort Gap Protection (15' + 5')

Christoph Wiesner (CERN)

13/12/2017, 11:40

Abstract:
In view of the newly implemented variable Abort Gap Keeper (AGK), this talk will review the protection layers that should prevent an injection of beam into the abort gap and identify the critical regions inside the abort gap. In particular, it will examine the accidental injection of several bunches into the abort gap after a filling-pattern change in September 2017 and discuss the...

32. New batch spacing (12' + 3')