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LHC Lumi Days

chaired by Helmut Burkhardt (CERN), Massimiliano Ferro-Luzzi (CERN), Michelangelo Mangano (CERN)
from to (Europe/Zurich)
at CERN ( 503-1-001 - Council Chamber )
Description

The aim of this workshop will be to review the results of the first luminosity calibration measurements at the LHC and to stimulate a discussion on future measurements. A total accuracy of around 5% seems achievable with the current instrumentation, on relatively short term. The need for and the challenges associated with a more precise determination will be debated. The importance of knowing the cross section scale to a given precision will be reviewed. Direct luminosity calibration methods will be compared to indirect methods, including recent experience at other  cyclical colliders. Physics motivations, systematic uncertainties, proposals for optimal running conditions for future luminosity calibration experiments, etc., will be openly discussed.

A list of useful references and documents of relevance for the workshop can be found here

To subscribe to the workshop mailing list, go to

https://simba3.web.cern.ch/simba3/SelfSubscription.aspx

and request to join the mailing list lhc-lumi-days@cern.ch

Information on accommodation, access to CERN and laptop registration is available from http://lpcc.web.cern.ch/LPCC/index.php?page=visit

Scientific Secretary: Alick Macpherson

Notes for Contributions
==================
A Proceedings will be produced and so all speakers are asked to provide a writeup of their talk. As such, we ask all speakers to take note of the following constraints

  • Speakers should write-up their contributions (1 paper per talk, no page limit but recommended length approx. 5 pages) by using the JACoW templates.

  • All papers (format ps and word or LATeX with images,  plus a pdf file of the paper) are to be uploaded directly inthe indico timetable by 1st of March at the latest.
     

  • The final proceedings will be made available via the web but possible also as a printed report in black and white. Therefore it is recommended to avoid color codes!

     
Go to day
  • Thursday, 13 January 2011
    • 09:00 - 12:55 Physics aspects 
      * What precision should the experiments aim at?
* What is the benefit for physics?
* Relevance of lum measurements at different energies
* Comparison between the reach of direct and indirect lum determinations
      Convener: Michelangelo Mangano (CERN)
      • 09:00 Welcome and introduction 5'
        Speaker: Massimiliano Ferro-Luzzi (CERN)
      • 09:05 Motivations and precision targets for luminosity 20'
        Speaker: Michelangelo Mangano (CERN)
        Material: Paper unknown type file pdf file Slides pdf file
      • 09:30 Indirect luminosity measurements: theoretical assessment 30'
        Speaker: Valery Khoze (Science Laboratories)
        Material: Slides powerpoint file pdf file
      • 10:05 TOTEM: prospects for total cross section measurements 20'
        Speaker: Dr. MARIO DEILE (CERN, PH-TOT)
        Material: Paper unknown type file pdf file Slides powerpoint file pdf file
      • 10:30 LHCb: indirect luminosity measurement 20'
        Speaker: Jonathan Anderson (Universitaet Zuerich)
        Material: Paper unknown type file pdf file Slides pdf file
      • 10:55 Coffee break 15'
      • 11:10 Status and prospects of ALFA 15'
        Speaker: Karlheinz Hiller (Deutsches Elektronen Synchrotron (DESY)-Unknown-Unknown)
        Material: Paper word file pdf file Slides powerpoint file pdf filedown arrow
      • 11:30 ATLAS: W and Z boson cross sections and prospects for other precision cross section measurements 20'
        Speaker: Matthias Schott (CERN)
        Material: Paper pdf file Slides powerpoint file unknown type file pdf filedown arrow
      • 11:55 CMS: W and Z boson cross sections and prospects for other precision cross section measurements 20'
        Speakers: Jeremy Werner (Princeton University), Jeremy Werner (Princeton University)
        Material: Paper pdf file Slides pdf file
      • 12:20 CMS forward detectors for indirect luminosity measurements 15'
        Speakers: Stephen Schnetzer (CERN), Steve Schnetzer (Rutgers University)
        Material: Paper pdf file Slides pdf file
    • 13:00 - 14:00 Lunch Break ( )
    • 14:00 - 18:30 First results of direct luminosity calibration and future prospects 
      * review results of 2009-2010 luminosity calibration experiments
* comparison to machine parameters (b*, emittances, ...)
* ATLAS/CMS cross comparison 
* review systematic uncertainties: current list and future prospects
* propose optimal conditions for future luminosity calibration experiments 
* requirements for a possible intermediate b* run in 2011?
      Convener: Massimiliano Ferro-Luzzi (CERN)
      • 14:00 BCTs and BPTX analysis results 15'
        Speaker: Thilo Pauly (CERN)
        Material: Paper unknown type file pdf file Slides powerpoint file pdf file
      • 14:20 ALICE 2010 luminosity determination 30'
        Speaker: Dr. Ken Oyama (University of Heidelberg)
        Material: Paper unknown type file pdf file Slides powerpoint file pdf file
      • 15:00 LHCb 2010 luminosity determination 30'
        Speaker: Vladislav Balagura (ITEP Institute for Theoretical and Experimental Physics (ITEP)-U)
        Material: Paper unknown type filedown arrow pdf file Slides pdf file
      • 15:40 LHCb beam-gas imaging results 15'
        Speakers: Plamen Hopchev, Plamen Hristov Hopchev (LAPP-Laboratoire d'Annecy-le-Vieux de Physique des Particules (L)
        Material: Paper unknown type filedown arrow pdf file Slides pdf file
      • 16:00 Coffee/tea break 20'
      • 16:20 CMS 2010 luminosity determination 30'
        Speaker: Marco Zanetti (MIT)
        Material: Paper unknown type file pdf file Slides powerpoint file pdf file
      • 17:00 ATLAS 2010 luminosity determination 30'
        Speaker: Mika Huhtinen (CERN)
        Material: Paper unknown type file pdf file Slides pdf file
      • 17:40 ATLAS/CMS comparison 15'
        Speaker: Dr. Beate Heinemann (LBNL and UC Berkeley)
        Material: Paper unknown type file pdf file Slides pdf file
  • Friday, 14 January 2011
    • 09:00 - 12:30 Instrumentation and machine aspects related to luminosity calibration 
      * overview/expectations of machine/beam properties
* review state-of-the art and/or novel technologies for beam current normalisation (for LHC-like beams), including experience from other hadron colliders
* review methods/possibilites to determine the beam current fraction that does not contribute to luminosity (for LHC-like beams)
* review intermediate b* options for 2011
      Convener: Dr. Helmut Burkhardt (CERN)
      • 09:00 Luminosity determination at the TEVATRON 25' 
        Covering the instrumentation and machine aspects related to luminosity calibration
20' + 5' discussion
        Speaker: Vaia Papadimitriou
        Material: Paper word file pdf file Slides pdf file
      • 09:25 Experience at CERN with luminosity monitoring and calibration, SpbparS, LEP... 25' 
        20' + 5' discussion
        Speaker: Rüdiger Schmidt
        Material: Paper word file pdf file Slides powerpoint file pdf file
      • 09:50 Instrumentation1 : Beam current transformer 25' 
        20' + 5' discussion
        Speaker: Jean-Jacques Gras
        Material: Paper pdf file Slides unknown type file pdf file
      • 10:15 Coffee Break 20'
      • 10:35 Instrumentation2: Other instruments, ghost/satellite bunch monitoring, halo, emittance, new developments ... 25' 
        20' + 5' discussion
        Speaker: Mr. Enrico Bravin (CERN AB-BI)
        Material: Paper unknown type file pdf file Slides powerpoint file pdf file
      • 11:00 IP positions and angles, knowledge and correction 25' 
        20' + 5' discussion
        Speaker: Jörg Wenninger
        Material: Slides powerpoint file pdf file
      • 11:25 High-beta optics 25' 
        Strategy to commission the intermediate 90m optics, running scenario, required knowledge of beam-parameters
20' + 5' discussion
        Speaker: Helmut Burkhardt
        Material: Paper unknown type file pdf file Slides pdf file
      • 11:50 Luminosity scans at LHC 25' 
        Including machine view on how to perform scans, minimize systematics and future prospects, also covering shortly RHIC
20' + 5' discussion
        Speaker: Simon White
        Material: Paper unknown type file pdf file Slides powerpoint file pdf file
    • 12:30 - 14:00 Lunch break ( )
    • 14:00 - 17:00 Summary and Discussion 
      Discussion of the next steps forward, goals, needed resources.
      • 14:00 Status summary and wishes from the experiments / Discussion 30'
        Speaker: Jaap Panman (CERN)
        Material: Paper pdf file Slides pdf file
      • 14:40 Summary as viewed from the machine / Discussion 30'
        Speaker: Paul Collier (CERN)
        Material: Paper word file pdf file