7:18 AM unstacking pbars; bunches 6, and especially 5 are light compared
to others
7:40 AM Begin run 1121 to disk
seps on, scraping
BD pbar or delay=22ns Pb out
7:58 AM end run 1121 19383 triggers to disk
8:10 AM seps off
Run delay curve; leave at 8ns for now
8:15 AM begin run 1122
PB out, MR ON, Seps OFF
BD Pbar or 8 ns
to disk
genmon reports Beamtrig/BDPbar or rates = 2.0!!
8:42 AM Mike Longo traces the problem to an unterminated cable
problem fixed at events ~58222
9:10 Online monitoring of Alphabet counter TDC's indicates that the sudden
time shift is recurring (Db,Dt,Bb,Bt by 70 TDC counts, Db by 75 TDC counts,
Ct by 45 TDC counts) Anomaly not seen in other counters
9:46 AM end run 1122 87095 triggers to disk
09:54 AM Begin run 1123 to tape MIN213
Pb out BD Pbar-or delay=8ns
throughout much work by Dick/Bill parasitically studying timing signals
wioth scope
10:45 AM
MCR calls to tell us that the second E811 scrape is about to begin
end run 1123, 37131 triggers to disk
swap TDC module
11:05 AM begin run 1124 to disk
BD Pbar-or 8n Pb out MR still ON
TDC's look beautiful!
Dick Adds Pbar or TDC N=2, A=2 {TDC(11)--on the fnmine genmon, this was already
labeled as an upstream TDC, but this must predate bj's June 15th message; the
only current inputs to this TDC are 9,10,15,16 which are K-counters; the
pbar-or input goes through a LOT of delay cable to fit in the gate of this
module!}
Call MCR--only 1 pbar bunch shows any significant number of pbars! Did they
over scrape? "We don't think so--we're working on it" They call back a
few minutes later to report that because of the low currents, their
instrumentation had trouble picking it up...but now they have it.
Now Dick begins to work on getting the new Kicker ADC's to read out
[ADC(133)-ADC(136) to read out.
D0 luminosity .06e30, protons ~3.5e9/bunch, pbar~3e9 (except bunch 5~.6e9)
12:38 PM MCR calls MR going off for ~12 hours
at event #38529 of run 1124
Dick fixes kicker ADC's [calibration in ADC(138)]
end run 1124
91976 triggers to disk
2:27 PM move Pb in
Run a delay curve...concensus of Dick, Bill, Cyrus is to leave at 8ns
3:03 PM
Begin run 1125 to tape MIN214
BD pbar-or delay=8ns PB in No MR
[very quiet running...]
12:20 AM 22 January '96: beamtrig rate = 6Hz
1:20 AM end run 1125, 251501 triggers to tape
1:20 AM start run 1126 to MIN215
MR off Pb IN, BD Pbar or delay=8ns
4:18 AM end run 1126, 50479 triggers to tape
4:21 AM Begin run 1127 to tape MIN216
MR off PB IN BD Pbar or delay=6 (six) ns
[histograms suggest that this may reduce beam gas content rather
substantially: from ~1% to .1%?? NHITS may increase slightly...will check
efficiencies after store ends...the check is the number of entries in
pbar adc multiplicity with 0 pbar counters firing, which, if I did the
arithmetic right, dropped from about 1% to about .1%]
4:48 AM MCR calls to report that they will resume MR operation at 5:00
4:50 AM restore MR gate (at event number ~412177)
5:14 AM MR operation still somewhat intermittent
5:30 AM beamtrig rate ~5 Hz
8:03 AM seps on 28944 triggers to tape store ends
Cyrus