Presents: CB, SF, MG, JJ, VK, AK, TR, GRdM, TW

• Follow-up of actions from previous meetings
  • Beam 2 in MAD-X -> (Action: MG) (pdf file)
    • Comparison of optical parameters for beam 2 clockwise and counter-clockwise in MAD-X was performed: excellent agreement.
    • Comparison of optical parameters for beam 2 counter-clockwise in MAD-X and SixTrack was performed: excellent agreement.
    • Comparison of optical parameters for beam 2 clockwise in MAD-X and SixTrack was performed: no agreement. It is suggested that the converter is not working properly for bv=-1. Detailed checks should be performed (Action: FS).
    • Next steps (Action: MG):
      • Compare beam 2 clockwise with bv=+1 in MAD-X and beam 2 clockwise with bv=-1 in SixTrack.
      • Check tracking in SixTrack using beam 2 counter-clockwise and a special version of beam clockwise with bv=+1 (Action: TR).
• Report from meetings
  • Sector test meeting -> HB (minutes are available here)
    • BLMs: issues of calibrations discussed.
    • List of studies during sector test is available. Few more proposals were made by HB.
    • 10 quenches are foreseen. Each will require about 2 h to recover.
    • Details concerning the organisation of the sector test are not available, yet. Two sessions will be devoted to this at the forthcoming Chamonix Workshop.
  • InjWG -> HB
    • A study concerning the impact on the LHC (quench of magnets) due to a major failure in the transfer line was presented: no major issue found.
    • A review of the injection protection devices was made: delivery schedule is tight, but no delay is expected so far.
    • A note will be prepared to summarise the studies concerning the optics flexibility of the LHC injection lines, including a cost estimate of the installation of additional collimators in view of improving the flexibility (Action: HB, AK).
  • MEB -> SF
    • MBs allocation is in stand-by, waiting for the last few magnets required to complete sector 3-4 and 4-5 to be available.
    • SSS have top priority for the installation. 100 SSS have been allocated so far.
    • Three special SSS have been allocated on the left side of IP8.
    • By the end of 2005 the following results should be achieved:
      • Complete the allocation/approval of 4 sectors of MBs
      • Complete the allocation/approval of 3 sectors of SSS
      • Complete the pre-allocation of sector 3-4 for the SSS
  • SLM -> MG
    • Degradation of network performance was discussed and a solution found: two routers will be installed. The need of a wireless LAN is under consideration.
    • On 14/12/2005 there will be a presentation at the LTC concerning the organisation of the LHC commissioning.
    • RHIC will be shut-down until September 2006 due to budget cuts.
  • LTC -> MG
    • Main topic of interest was the review of the Field Quality Working Group activities.
  • MAC -> JJ
    • The next meeting will be held on December 8th until December 10th.
    • A review of the Field Quality Working Group and MEB activities will be given.
    • FZ will replace JJ as Scientific Secretary of the MAC.
• Chamonix Workshop organisation -> MG
  • List of attendees from LOC was prepared by MG: feedback was given. The final version will be communicated to OB.
  • Draft programme is available including proposals for talks and speakers.
  • Any feedback should be sent to MG.
• Status of optics database -> TR (pdf file)
  • Following the recent results of the aperture studies for IR8, the situation concerning the optics configuration with protons is clear.
  • Various configuration will be made available in the database.
  • Additional information is required for the ions, such as (Action: JJ):
    • optics for IR2 with beta* = 1 m for early ions scheme
    • definition of the optical configuration and crossing scheme for IR1, IR5 and IR8 both for the early ion and nominal situation.
  • A dependence of the crossing angle on the setting of the spectrometer compensator is proposed for IR2 and IR8: the meaning and use of the switches on_x*, on_sep*, on_lhcb, on_alice is not changed.
  • A new switch to select proton or ions configuration will be introduced: a proposal will be presented in a forthcoming meeting.
  • All the changes will be implemented upon agreement with the people performing numerical studies.
  • The ultimate goal is to update the web pages with the optical configurations.
• Quadrupole vibrations and emittance growth -> FZ (pdf file)
  • On behalf of FZ, MG presents few slides.
  • Quadrupole vibrations at few kHz could generate random kicks, which heat the beam inducing an emittance growth.
  • These vibration could also come from the vibration of the beam screen in the cold bore induced by the He flow.
  • Similar phenomena (already considered in the framework of studies for the future linear colliders) have been observed at RHIC and Tevatron.
  • A meeting was called with AT-MAS specialists to discuss about a measurement campaign to assess the seriousness of the problem for the LHC.
  • A SSS will be used and it will be equipped with sensors to measure the vibration modes of the whole structure, the damping between the cold mass and the cryostat. In case, measurements in cold conditions could be envisaged.
• AOB

Colour code:

• Black: proposed agenda
• Red: outcome of discussion at the meeting