CERN Accelerating science

Post Mortem & Timing

We need to be able to dump one beam without provoking a PM. The use cases:

• Inject & Dump 0 � 1000 turns Use a timing event at 100 ms to provide redundancy for increased screen protection Start table on pre-pulse receipt
• Circulate & Dump 0.1 � 1000 s Will use the timing system to trigger the beam dump via the BIS. (If a user permit is pull during this mode the PM event should go out as normal.)
• Filling - intermediate Will use the timing system to trigger the beam dump via the BIS.
• MD mode Dump one beam Will use the timing system to trigger the beam dump via the BIS (implies two BD events)

First question(s):

• If we pull a user permit does the BIS systems dump both beams?
• It would seem reasonable that it does.
• However, we need to be able to condition this behaviour, presumably on mode.

Further, given the ability to only dump one beam, we need to be able to supress the post-mortem.

OR

We need to be able to post-mortem one beam without compromising a full post-mortem on the other beam.

(even then we don't want the post-mortem process on beam A to prevent safe re-injection of beam within, say, 15 seconds.

Sticking something between the BIC and the timing system (possibly with a timing receiver card) would appear to be appropriate. This box could decide whether or not to pass a edge to the CTG.