L1Cal Pedestal Studies Sabine Lammers Philippe Laurens
26-Sep-2006
Slide 2
Test Conditions on 26-Sep-2006 This data was collected starting
around 18:30, while the detector was closing. The closing process
normally takes ~1 hour, but took closer to 4, and we think they
started shortly after 6pm. The conditions for these tests thus
probably started closer to (C) with the iron in motion. (A) CAL
powered but not read out; PDT A-Layer off (powered down); SMT off;
CFT on; iron open (B) CAL powered but not read out; PDT A-layer on;
SMT off; CFT on; iron open (C) CAL powered but not read out; PDT
A-layer on; SMT on but not read out; CFT on; iron open (D) CAL
powered but not read out; PDT A-layer on; SMT on but not read out;
CFT on; iron closed
Slide 3
Example: HD_TT(+9,19) Fairly quiet Iron Closing Raw ADC
oversampled data: Average and Standard Deviation of 4x159=636
independent 1,000 point histograms
Slide 4
Iron Closing Raw ADC oversampled data: Average and Standard
Deviation of the samples used for the 36 Live Crossings Example:
HD_TT(+9,19) Fairly quiet
Slide 5
Example: HD_TT(+9,22) High 132ns synchronous noise Low
Turn-wise synchronous noise Iron Closing
Slide 6
Example: HD_TT(+9,22) High 132ns synchronous noise Low
Turn-wise synchronous noise
Slide 7
Iron Closing Example: HD_TT(+9,9) High 132ns synchronous noise
High Turn-wise synchronous noise
Slide 8
Iron Closing Example: HD_TT(+9,9) High 132ns synchronous noise
High Turn-wise synchronous noise
Slide 9
Random Noise does not change noticably while Iron is Closing
Iron Closing
Slide 10
Pedestal Fluctuation wrt. Live X (i.e. turn-wise synchronous
noise) increases while Iron is Closing Iron Closing
