L1Cal Pedestal Studies Sabine Lammers Philippe Laurens 26-Sep-2006.

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L1Cal Pedestal Studies Sabine Lammers Philippe Laurens 26-Sep-2006

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

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

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

Example: HD_TT(+9,22) High 132ns synchronous noise Low Turn-wise synchronous noise Iron Closing

Example: HD_TT(+9,22) High 132ns synchronous noise Low Turn-wise synchronous noise

Iron Closing Example: HD_TT(+9,9) High 132ns synchronous noise High Turn-wise synchronous noise

Iron Closing Example: HD_TT(+9,9) High 132ns synchronous noise High Turn-wise synchronous noise

Random Noise does not change noticably while Iron is Closing Iron Closing

Pedestal Fluctuation wrt. Live X (i.e. turn-wise synchronous noise) increases while Iron is Closing Iron Closing