Author: Matis, H.S.
Paper Title Page
MOPPR076 Using the BRAN Luminosity Detectors for Beam Emittance Monitoring During LHC Physics Runs 966
  • A. Ratti, H.S. Matis, M. Placidi, W.C. Turner
    LBNL, Berkeley, California, USA
  • E. Bravin
    CERN, Geneva, Switzerland
  • T.E. Lahey
    SLAC, Menlo Park, California, USA
  • E.S.M. McCrory
    Fermilab, Batavia, USA
  • R. Miyamoto
    ESS, Lund, Sweden
  • S.M. White
    BNL, Upton, Long Island, New York, USA
  Funding: This work partially supported by the US Department of Energy through the US LHC Accelerator Research Program (LARP).
The BRAN Ionization Chambers installed at the IP1 and IP5 Interaction Points of the LHC provide a relative measurement of the total and bunch-by-bunch luminosities. This information, combined with the logged bunch charges from a fast BCT monitor, offers the possibility of evaluating the Interaction Area in collision for each of the colliding bunch pairs and monitor its time evolution. A Graphic User Interface (GUI) has been implemented to display the interaction area of the proton bunches interacting in IP1 and IP5 during each of the Physics Runs in the attempt of displaying the contribution to the Luminosity time decay originating from possible emittance blow-up when operating the Accelerator close to the beam-beam limit. Early results confirm the ability to characterize the bunch by bunch emittance behavior during the store and study possible differences among bunches in the same fill.