Presents: CB, HB, WH, MG, JBJ, AK, RdM, GRdM, SR, TR, TW, FZ

• Follow-up of actions from previous meetings
  • Transfer shift of interaction point in IR2 -> JJ (pdf file)
    • A solution to increase the aperture in IR2 is presented: it entails the vertical displacement of the IP by 1 mm. This reduces slightly the beam-beam separation. To be checked:
      • Possibility of increasing the crossing angle to restore nominal separation (JJ).
      • Checking the the impact of the reduced beam-beam separation (WH).
  • Recent progress in the high-beta optics for IP1 and IP5 -> HB (pdf file)
    • Concerning the 90 m optics for TOTEM in IR5:
      • Beam 2 optics is available now.
      • Both Beam 1 and Beam 2 optics were re-matched to have nominal tune in collision. In the vertical plane the tune is correct, while in the horizontal one 0.08 units are still missing. This should be compensated using other means (IR4, arcs).
• Report from meetings
  • MEB -> MG
    • Activities progress according to the schedule.
  • WAMDO Workshop -> RdM (pdf file)
    • Review of the current activities in the field of LHC upgrade (IR layout) and magnet design (materials and magnet cross-section).
  • TCC -> MG
    • Nothing to report
  • SLM -> MG
    • No sector test is foreseen for 2006
    • A new magnet performance panel is being set-up in AT. A. Siemko will be the Chairman.
• New implementation of the nonlinear matching in MAD-X -> RdM (pdf file)
  • The new mode is based on the idea that:
    • The constraints can be user-defined expressions
    • The calculations for evaluating these expressions can be defined via macros
  • In this way everything that can be calculated via macros and expressions can be used for matching:
    • Solution for linear or non linear system of equations
    • Chromatic and non linear effects.
  • The new matching will be part of the next release of MADX.
• Hysteresis effects for insertion quadrupoles -> MG (pdf file)
  • Thanks to a special version of the error routines provided by SF the hysteresis effects can now be included in the simulations.
  • Critical cases: MQM-like and MQY quadrupoles (low powering at injection).
  • Minimum DA is now at 10.2 sigma.
• AOB

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