Here the deadtime looks quite reasonable compared to earlier runs at the same kinematics. We have, for the present run, (run 4395) about 10% deadtime at 1 kHz trigger rate (beam current is 3.4 µA).
I compare this to run run 2643 which had similar deadtimes for similar beam rate and prescale factors.
So, the Carbon target run remains a bit of a mystery (the details
of the prescaling factors differed from the comparable run at the same
kinematics, so perhaps the triggers contributed to very different
different event sizes...) but at least the present run looks reasonable,
so we are comfortable proceeding to production kinematics.