Make New Entry,
Make Followup Entry
User name R. Michaels
Log entry time 20:46:40 on February 11, 2009
Entry number 260549
This entry is a followup to: 260534
keyword=missing synch on L-HRS
"missing synch" normally means some crate is missing a gate. It looks like ~2% of
events are affected. One quick thing you can try is to run with unbuffered mode and
see if it goes away (would be odd). Another thing to try is T8 events (low ps8), see if the
rate of missing gates increases. Run pure T3 and see if the rate becomes negligble.
In that case it's a "marginal timing" problem which I won't explain here. That's possibly
dangerous. Depending on the outcome you then have a decision tree, e.g.
(1) run unbuffered, (2) decide to live with it, (3) spend N hours trying to figure this
out (N = ?, maybe 2 if lucky).
A guess: it's still there unbuffered, was perhaps not noticed up to now, and is a "marginal
timing" for events that don't have a normal scintillator retiming.
I'm at home, and it's difficult to study this from here.
A copy of this log entry has been emailed to: firstname.lastname@example.org,email@example.com