Presents: RA, HB, SF, MG, JBJ, JJ, AK, AL, RdM, FS, SR

• Follow-up of actions from previous meetings
  • Comparison between aperture models -> JJ (pdf file)
    • Detailed comparisons between aperture models available in progress
    • Possibility of generating various types of output to fit user's needs
• Report from meetings:
  • MEB -> SF, MG
  • WGA -> JBJ
    • Point postponed to next meeting
• Overview of the Machine Protection Review -> RA, HB (pdf file)
  • Committee acknowledged the quality of the work done at CERN
  • Issues:
    • Software interfaces
    • Need of a spare beam dump?
    • Aperture kicker
    • Fast vacuum valves
    • How to operate the collimation system?
  • Follow-up:
    • Injection process
    • Kickers (tune and aperture)
    • Damper
• News about the aperture kicker -> FS
  • Activity put in stand-by after the review. However, kicker is part of the tune kicker and cables and generators already ordered. Stopping the development of this device will free only manpower
  • Discussion will continue in the LHCOP, which will then bring the conclusions to the LTC
  • Points to be clarified/studied to support the request following the rejection by the Review Committee
    • Is pilot bunch at 7 TeV capable of inducing damage?
    • Are there alternative means to measure dynamic aperture?
    • Is it possible to reply to the criticism/concern expressed by the Committee?
• Transfer function accuracy for lattice correctors -> AL (pdf file)
  • Accuracy of transfer function at the level of % seems to be enough for correctors in the SSS
  • Hysteresis might be an important issue, in particular from an operational point of view
  • Measurement results from two MOs showed completely different values of the hysteresis
• Situation of the MQTL magnets -> MG (pdf file)
  • Serious concern for MQTL production rate and performance (training)
  • Proposal to install weak MQTLs in appropriate locations will not fix the problem
  • Sector test might suffer from MQTL problems
  • Actions: analyse other optical configurations (IR3 detuned) report to LTC -> MG
• AOB
  • A board for the new staff in the LOC Section will take place next week
  • A joint meeting with RLC Section was proposed by W. Herr to present the more recent studies with D. Kaltchev. The proposed date is Friday 13th (to be discussed with F. Ruggiero).
  • Aperture optimisation of SSS058: a shift together with a rotation will fully recover aperture. However, this will spoil the field direction, which is not measured but deduced from the results of the magnetic axis. It is decided to give priority to field direction and apply only the shift but not the rotation. This guideline will be applied also for future SSS featuring similar problems.

Colour code:

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