Draft

Present: James, Mark, WIlliam, Gunn, Lauren, Hikmet, Christine

RF Impedance

• In terms of RF impedance acceptance, can we put the SPS BGI instrument as it is, in the LHC ?  We keep the rectangular vacuum tank and only add tapered beam pipe to adapt to the LHC 80mm beam pipe
• Hikmet and Christine will come back to us by end of March, or earliest with an answer.
• Consider LHC beam parameters for the 2026 run (and not the HL-LHC) 
• Beam pipe length is ~1.6m
• If the vacuum team ask for NEG coating of the chamber, will this change the RF impedance ?

Prototype instrument availability

• Spare SPS BGI instrument, we have most mechanics
• Check in terms of vacuum acceptance (LCP/Staystick or alternative, max bakeout temperature/duration)
• Can we keep timepix cooling water on while doing bakeout ?
• The ceramic plate is held on 4 screws, see if this breaks due to thermo-mechanical movements during bakeout
• James will send past outgassing test reports to William (on staystick, done by Alice Michaud)
• To be followed with vacuum team