Ken and I have been working on chamber efficiencies this evening.
Some latches changed, nano delays updated, chamber voltages scanned.
Here's the way it stands:
chamber Tom's setting new voltage efficiency occupance
101 2810 2836 95.2% see the WLS file
102 2770 2821 92.0
103 2900 2899 96.8
104 2900 2899 98.1
105 2900 2900 98.6
106 2775 2875 98.2
107 2850 2902 96.8
108 2870 2945 94.0
109 2740 2739 91.5
110 2810 2808 92.4
111 2770 2772 97.0
112 2900 3000 93.7
113 2790 2788 96.9
114 2800 2803 96.6
115 2800 2799 95.5
116 2780 2782 93.6
117 2950 2951 96.1
118 2840 2843 90.4
119 2900 2913 94.1
120 2850 2903 88.7
121 2900 2901 97.0
122 2840 2841 89.6
123 2834 2830 91.1
124 2750 2751 83.6
All numbers are from run 1086, a bd pbar or 22ns pb out beam gas run
which can be found on FNALU (with many friends) in $MINIMAX_DATA/d11.
The .WLS file can be found in ~tlj/run_anal/R1086.WLS. The
shakedown histograms can be found in $MINIMAX_CODE/wld/generic/run1086.ps
Note that the new numbers do not have the science of Tom's previous
voltage settings--rather starting with the old settings, the goal was
to tinker with the settings until efficiencies were in the mid 90's,
where possible. This did not seem to be possible with the back
chambers, and indeed Ken pointed out that as one moves back in the
detector the measured efficiencies of the u' chambers are lower than
neighboring u chambers suggesting that this may be an artifact. The
last stand is michigan, and the median pulse heights Tom finds are
healthy, suggesting perhaps a geometric explanation rather than
truly bizzare chamber response. In any case, I can't get them to go up!
Wish us luck after an all-too-brief night's sleep,
Cyrus
p.s. Ken tweaked up the voltage on a couple of the calorimeter modules...
you might want to check out the ADC's...
pps--after noting that increasing the voltage on chamber 120 helped not
at all [compare R1085.WLS], I have moved it back to 2849, and chamber
119 back to 2903.