Meeting on Linac4 - PSB BI Line, 09 March-2010

Present:  C. Bracco, C. Carli, B. Goddard, L. Sermeus, B. Mikulec, J-L. Sanchez, T. Fowler, m. Hourican, J. Borburgh, B. Balhan, R. Chamizo

• Results from BS simulations (Slides BB)
  Varied conductivity of graphite by factor 10 up and down - field error is fully linear with the conductivity.
  Specify that dump block conductivity should not be higher than 1e5.
  Does conductivity change with dose? RC will check this.
  Would be good to launch 3D model of field to see geometric effects, and then eddy currents. BB will check this.
  Also possible to look at results from similar MedAustron magnet - JB Could present this soon.
  Data from present 2D simulations to be sent to CC for simulations - JB/BB.
• BI.DIS triggering and interlocking (Slides BG)
  Will get a pre-injection warning (ms timing) 200-300 ms before injection. This should start PFN charging (capacitor PS). Linac4 timing system will then send 5 pre-pulses (fast ns timing), one per DIS ring. An 'interlock' check signal some 5 ms before injection can be used to check PFN voltages & state. If pre-pulses come within 6-7 ms of the 'interlock check' event, the DIS rings are triggered. An internal re-triggering system should fire each ring at 100 us intervals, after FIRST trigger received. Need to check the re-triggering use cases to make sure no problems. Should make sure the fast timing signals come from the SAME source as the chopper. DIS will supply one interlock signal - this can maybe be masked on a ring-by-ring basis, if the kicker is OFF.
  BG/WW/EC/BM will prepare a specification for the DIS triggering and interlocking for distribution.

BG