Looking for effects of PDT state changes on Pedestals (or
Pedestal Adjustments) during 14-Jan-2008 05-Feb-2008
Slide 2
PDT status on 14-Jan-2008 From Selcuk: At 13:51, Cal plots with
both PDT 12 and 16 on. At 14:24, Cal plots with PDT 16 off. At
14:48, Cal plots with both PDT 12 and 16 off. So, most likely,
untill 13:50 (or a few minutes before) both PDT 12 and 16 were on,
and at that time PDT 16 was turned off. At about 14:24 (or a few
minutes before) the PDT 12 turned off.
Slide 3
Question? Darien: My motivation is that I wanted to know if
L1cal needs some "settling time" for the pedestal adjustments to
catch up to changes induced by a change in muon power
configuration. In this case, I think it was done between stores, so
it was not an issue, but sometimes these muon changes need to be
done during a store, in which case some of the data taken shortly
afterwards might have strange trigger conditions.
Slide 4
Average Ped Tracking Quantities
Slide 5
Individual Towers Ped Tracking Quantities Plot the Drift and
Standard Deviation from the target 8 count of Zero Energy Response,
for some quiet towers and some known noisy towers. The underlying
changes are occluded by the Active Pedestal Adjustment. The
corrections turn pedestal step changes into spikes. In order to
document the true effect, we need to look at the DAC control value
being automatically adjusted.
Slide 6
EM_TT(- 2, 5)
Slide 7
EM_TT(- 7,12)
Slide 8
EM_TT(- 8, 9)
Slide 9
EM_TT(+ 1, 1)
Slide 10
EM_TT(+ 7,27)
Slide 11
EM_TT(+ 8,26)
Slide 12
HD_TT(- 2, 5)
Slide 13
HD_TT(- 6,26)
Slide 14
HD_TT(- 7,12)
Slide 15
HD_TT(- 7,26)
Slide 16
HD_TT(- 8, 9) Temporary step change from ~14:50 to ~15:00
