- Alexandre seems to be running Compton DAQ remotely, but background
is high (2 KHz/µA).
- Dead time on the HRS DAQs is very high (order 90%) for runs since
5291(right arm) and 25747(left arm) because the FADC readout was turned on by
Kai Pan (see Halog
entry 302452).
10:05 RF trip rate over the last couple of hours is about
15/hour. Seems rather high.
10:40 Bob Michaels calls: he will do expert analysis
check-out. He also suggests that we
try increasing prescale factors to reduce the deadtime while the FADC is
being readout. Kai Pan
will try this.
After a couple of junk runs (problems resetting the pre-scale factors and
a CODA crash),
we have adjusted the prescales as follows,
for runs 5298 (right arm)
and 25755 (left arm)
while run 14207 (HAPPEx) continues:
Left arm Right arm
ps1 4000 1200 ps2 2800 800 ps3 2 60 ps4 2 4 ps5 10 80 ps6 2800 80 ps7 40000 8000 ps8 200 200The effect is that the deadtime at 110 µA goes from 80-90% down to 30-40% for left arm and to 50% for right arm.
11:15 MCC calls - they lost an IOC for the RF; beam will be off for at least 15 minutes.
11:43 Beam returns.
12:55 MCC calls - beam will be off for 30 minutes or so, for orbit and pathlength checks - goal is to improve rates for the Compton.
While beam is off, we turn the FADC readout off again and reset
prescalers to appropriate values for no FADC.
See: halog
entry 302534
13:30 Beam returns. Start new runs. Compton rates look much improved!
14:30 HAPPEx run hangs up. 81.6K events - ROC 23 in disconnected state. KCODA and restart. It is important for shiftcrew to stay vigilant to ensure HAPPEx DAW continues running. I find keeping Runbird on a monitor screen is up a convenient way to monitor this.
14:50 Alex calls, and says Compton tuning is completed. We
have been taking that data regardless
during the tuning.
At present, we see about 60 Hz/µA for
Compton Photon Detector -
was 1000-2000 Hz/µA before tuning began.
15:35 Xiaochao and Ramesh turn on 1 KHz tagger at start of runs 14213, 5301, 25757. Will be a 20 minute run, should not count these pairs as "good pairs".
16:00 Shift ends
Runs Taken
DAQ Run Number Events or Good Pairs --- ---------- -------------------- HAPPEx 14204 39.4 K HRS(R) 5292 0.91 M HRS(L) 25749 0.70 M HAPPEx 14205 36.3 K HRS(R) 5293 0.24 M HRS(L) 25750 ?? HAPPEx 14206 31.3 K HRS(R) 5294 0.90 M HRS(L) 25751 1.20 M HAPPEx 14207 (continues) HRS(R) 5295 0.17 M HRS(L) 25752 0.19 M HAPPEx 14207 (continues) HRS(R) 5296, 5297 (JUNK) HRS(L) 25753, 25754 (JUNK) HAPPEx 14207 29.5 K HRS(R) 5298 0.20 M HRS(L) 25755 0.19 M HAPPEx 14208 42.4 K HRS(R) 5299 (continues) HRS(L) 25756 (continues) HAPPEx 14209 11.8 K HRS(R) 5299 0.59 M HRS(L) 25756 0.59 M HAPPEx 14210 16.7 K HRS(R) 5300 (continues) HRS(L) 25756 HAPPEx 14211 (JUNK) HAPPEx 14212 32.4 K HRS(R) 5300 1.23 M HRS(L) 25757 1.41 M HAPPEx 14213 (underway) (1.109 kHz tagger on) HRS(R) 5301 (underway) HRS(L) 25758 (underway)