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Bunch Current Normalisation Working Group

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This working group has been jointly started by LHC-BI, LBS and LPC in order to understand and reduce the uncertainties of the LHC bunch currents which enter the luminosity calibration measurements.

The first report from this working group can be found below.

Mandate:

Provide all LHC users with best possible estimation of LHC beam and bunch intensities, including uncertainties, by using all information available (from machine instrumentation and from the experiments). Document the results. Make recommendations to LMC. 

Present contact persons:

Jean-Jacques GRAS for BE-BI
Helmut BURKHARDT for the LBS study group
Massimiliano FERRO-LUZZI convener  / LPC
Martino GAGLIARDI for ALICE
Witold KOZANECKI for ATLAS
Andrzej ZURANSKI for CMS
Vladislav BALAGURA for LHCb
Kazuya TAKI for LHCf
Mario DEILE for TOTEM

Members/participants: see e-group

Meetings: see Indico agenda pages here

For the luminosity calibration measurements, see here.

Literature references:

  1.  "Results of the LHC DCCT Calibration Studies", C. Barschel et al., CERN-ATS-Note-2012-026 PERF. link

  2. "Study of the LHC Ghost Charge and Satellite Bunches for Luminosity Calibration", A. Alici et al. (BCNWG note4), CERN-ATS-Note-2012-029 PERF. link

  3. "Study of the Relative LHC Bunch Populations for Luminosity Calibration", G. Anders et al. (BCNWG note3), CERN-ATS-Note-2012-028 PERF. link

  4. "First results of the LHC longitudinal density monitor" A. Jeff, A. Boccardi, E. Bravin, A.S. Fisher, T. Lefevre, A. Rabiller, F. Roncarolo, C.P. Welsch, Nuclear Instruments and Methods in Physics Research, A 659, December 2011, 549-556. link

  5. "Optimization of the LHC beam current transformers for accurate luminosity determination" J.J. Gras et al., Proc. of IPAC 2011, San Sebastian, Spain, CERN-ATS-2011-063  link

  6. "LHC Bunch Current Normalisation for the October 2010 Luminosity Calibration Measurements" A. Alici et al. (BCNWG note2), CERN-ATS-Note-2011-016 PERF link

  7. "LHC Bunch Current Normalisation for the April-May 2010 Luminosity Calibration Measurements" G. Anders et al. (BCNWG note1), CERN-ATS-Note-2011-004 PERF link

  8. "The 2010 LHC DC BCT measurement system and its main sources of uncertainties", J.J. Gras, M. Ludwig, P. Odier, CERN-LHC-Project-Note-432. link

  9. "The 2010 LHC ring Fast BCT measurement system and its main sources of uncertainties", D. Belohrad, J.J. Gras, M. Ludwig, CERN-LHC-Project-Note-433. link

  10. "Commissioning and First Performance of the LHC Beam Current Measurement Systems" , D. Belohrad et al.,  1st IPAC, Kyoto, Japan, 23 - 28 May 2010. link

  11. "The DCCT for the LHC Beam Intensity Measurement", P. Odier et al., DIPAC’09, Basel, Switzerland, 25 - 27 May 2009. link

  12. "DCCT technology Review", P.Odier, in Proceedings of CARE-HHH-ABI Workshop on DC Current Transformers and Beam-Lifetime Evaluations, Lyon, France, 1–2 December 2004, CARE-Conf-04-023-HHH (2004), eds. A. Peters, H. Schmickler, and K. Wittenburg. link

  13. "The LHC Fast BCT system: A comparison of Design Parameters with Initial Performance", D. Belohrad et al. BIW’10, Santa Fe, New Mexico, USA, 2 - 6 May 2010. link

 

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