Make New Entry,
Make Followup Entry
User name R. Michaels
Log entry time 00:39:24 on February20,2009
Entry number 262202
keyword=re: run 1597 glitches
I think the glitches seen in run 1597 (halog 262096) are due
to deadtime (see fig 1), while meanwhile the beam current was
pretty stable (fig 2) meaning the trigger rate did not drop out.
Why we're getting deadtime ? Per discussions with Moffit, the
deadtime is probably caused by saturation of the network near
bigbite. We might alleviate this by using N cables run in parallel
to the switch in the mezinine. I'll investigate whether we can
do anything on adaql2 side (using adaql2-192 may help).
The DAQ rate was ~80 mbit /sec and the network is only 100 mbit/sec
near the little switch that services several DAQ crates.
This deadtime may cause fluctuations in the asymmetry unless one
eliminates the periods.