User name R. Michaels
Log entry time 13:24:39 on October30,2007
Entry number 210638
This entry is a followup to: 210350
keyword=Scaler clock mystery resolvedThere are multiple clocks, e.g. a 103760 Hz clock is in
the following places (at least):
R-arm scaler slot 3, chan 0
L-arm scaler slot 9, chan 0
There is good evidence the 1024 Hz clock which is in the 8th
channel of normalization scaler was busted on the R-arm for a
period of time around runs 1430 / 20244. However it looks ok
now (perhaps a bad cable ...) I have analyzed these runs with
the 103 kHz clock using these THaScaler options:
if (bank == "Left") {
scaler->SetClockLoc(9,0);
scaler->SetClockRate(103760);
}
if (bank == "Right") {
scaler->SetClockLoc(3,0);
scaler->SetClockRate(103760);
}
Note, there is also set in the scaler.map file but this only affects
xscaler. The map file entries are:
xscaler-clock Left slot:9 chan:0 rate:103760
xscaler-clock Right slot:3 chan:0 rate:103760
and the old xscaler-clock lines must be deleted.
Results for these runs (1430 and 20244):
The trigger rates were similar (see fig 1) and the scaler
summaries reasonable, see below. The time-length of the
two runs are now similar.
/adaql2/data3/e05110_1430.dat.0
------------- Scaler Summary ----------------
Scaler bank Left
clock location 9 0
clock counts 104238149 clock rate 103760
Time of run 16.74 min
Triggers: 1 = 1063637 2 = 0 3 = 1134640 4 = 37631 5 = 0
Accepted triggers: 962027
Accepted triggers by helicity: (-) = 0 (+) = 0
Charge Monitors (Micro Coulombs)
Upstream BCM gain x1 90980.02 x3 91297.05 x10 77045.22
Downstream BCM gain x1 95185.30 x3 95032.26 x10 81815.85
###########
/adaql1/data2/e05110_20244.dat.0
------------- Scaler Summary ----------------
Scaler bank Right
clock location 3 0
clock counts 104000319 clock rate 103760
Time of run 16.71 min
Triggers: 1 = 1060803 2 = 30304 3 = 0 4 = 0 5 = 0
Accepted triggers: 955343
Accepted triggers by helicity: (-) = 0 (+) = 940960
Charge Monitors (Micro Coulombs)
Upstream BCM gain x1 90739.75 x3 91055.92 x10 76913.01
Downstream BCM gain x1 94933.86 x3 94781.24 x10 81598.45
FIGURE 1
