Scrubbing: Expectations and Strategy, Long Range Perspective

Authors

  • G. Iadarola CERN, Geneva
  • G. Rumolo CERN, Geneva

DOI:

https://doi.org/10.5170/CERN-2015-002.114

Keywords:

LHC, performance, Chamonix.

Abstract

Electron cloud buildup simulations and machine experience during Run 1 showed that electron cloud effects could significantly limit the performance of the LHC when operating with 25 ns bunch spacing. Beam induced scrubbing will have to be used to lower the Secondary Electron Yield (SEY) of the beam chambers and therefore reduce electron cloud induced pressure rises, heat load and beam degradation. This contribution reviews the experience accumulated on electron cloud effects during Run 1 and define a possible scrubbing strategy to allow operation with 25 ns beams in 2015. Several measures taken during LS1 should allow for an improved scrubbing efficiency compared with Run 1. Moreover, the potential of using a dedicated scrubbing scheme based on the doublet beam, following the promising SPS tests in 2012, is described and analyzed. To conclude, possible alternatives of operation scenarios are defined, which will depend on the degree of success of the scrubbing runs.

Downloads

Published

2016-02-02

Issue

Vol. 2 (2015): Proceedings of the Chamonix 2014 Workshop on LHC Performance

Section

Article

License

Authors who publish with this publication agree to the following terms:

  1. CERN retains copyright and publishes the work licensed under the Creative Commons Attribution License 4.0 that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this series.
  2. Authors are able to enter into separate, additional contractual arrangements for distribution of the published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this series.
  3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).