Timing questions

1
Timing questions

• To chop or not to chop
• Trench test of fiber system (vs coil in oven)
• Sector test the copper part (local
  distribution, per Franks diagram).
• Can we have maintenance day where we replace a
  local timing module, and come back up with
  everything phased/timed the same? So we dont
  have go through and re-time everything.
• Two-channel receiver comparator scheme to be
  demod (redundancy scheme).
• Is there a credible low-cost way of building a
  vcxo with sufficient performance?
• Look at different schemes to meet the bunch
  compressor requirements.
• Demo the wavelength tuning trick over realistic
  temperature range.
• Failure modes and effects analysis.
• Pursue HOM phase detector scheme.
• How can we take advantage of linac symmetry to
  reduce stability requirements?
• Develop integrated timing system diagram
• Develop integrated timing system requirements
  table
• Develop integrated timing system master sequencer
  requirements.

2
Timing questions 2

• Separate local timing system (or piece) for each
  accelerator area, eg damping ring?
• Is there going to be a phase ramp? Or positron
  trombone?
• How do they do circumference feedback in damping
  ring? Has a chicane.
• How do we deal with 60Hz (50Hz) AC line sync? 5Hz
  sunk to the 60Hz, with fine time set up to make
  positron damping ring work.
• Does MPS timing have to be handled differently
  (more robust)? Tom make whole timing system
  robust enough so we can use it for the MPS.
• What is the master frequency? 13xxxxxxxx.xxHz?
  /-what?
• How do we prevent things being changed that might
  impact MPS? (LHC locks down all adjustable
  quantities)
• Rad damage issue for fibers (probably fine for
  parallel tunnels)? Damping ring?
• Need to run fibers in separate trenches (dynamite
  test)
• Can we keep running (for some time) with a broken
  fiber (lost redundancy)?
• Who owns what with MPS? Treaty points
  Ops/Controls GG, Instr TG, AGs, etc
• What (overall) MPS topics need to get raised at
  higher level (chicanes, dumps, etc)?

3
General controls questions

• Where do we put UPS?
• To what level do we have redundancy in power
  system?
• Who costs the central computing servers and
  networks (assume Controls)
• Where do we put machine info such as magnet field
  calibrations (in the ps?)