Trending ACD performance Parameters of interest Online tests (CPTs) TCI (charge injection) -> PHA TCI -> Veto mapping Timing PHA Pedestals Offline tests (muon runs) PHA Pedestals MIP peaks Test phases 20 CPTs GSFC, SLAC) Hot & cold in GSFC W/ and W/out LICOS/FSW 5 blocks (20 sub-blocks) of muon runs in Jan. and Apr.

CPT Test Phases At GSFC (08/05 – 09/05) Reference (not shown) PostVibe (1) Cold_1, Cold_2, Hot_2, Cold_3, Hot_3, Cold_4 (2-7) tvac_ambient, tvac_dooropen (8-9) At SLAC Pre-install (09/05) (off LAT, EM GASU) (10) Lat_1, Lat_2 (12/05) (11-12) Voltage drop b/c of Veto driver issue Licos (13-19) Various timing changes Hitmap delay (5  16), hold delay, trg_seq (80  89) Test point 13 was actually done with LATTE, but with LICOS-style scripts The TCI-strobe, poll trigger sequence is different from LATTE

Pedestal from online script GSFCSLAC TVAC LICOS/FSW (April 06) LATTE (‘05) In SLAC runs outliers are all from GAFE 17 channels Zero suppress is Set at 15 counts One Entry Per PMT

Hitmap Latching Delay GSFCSLAC TVAC LICOS/FSW (April 06) LATTE (‘05) Changing trg_seq from 80 to 89 caused a corresponding 9 count shift in the optimal hitmap_delay (delay before latching the discriminator status) One Entry Per PMT

Front End Hold Delay Timing GSFCSLAC TVAC LICOS/FSW (April 06) LATTE (‘05) The values at -35 are null values from a failed test. Otherwise this just reflect the change in trg_seq There is more scatter than hitmap delay b/c this is the analog hold time One Entry Per GARC

TCI to PHA mapping GSFCSLAC TVAC LICOS/FSW (April 06) LATTE (‘05) Need to confirm that effects in TP come from new strobe-poll sequence & that they were corrected by the trg_seq change One Entry Per GARC

TCI Linearity & Noise GSFCSLAC TVAC LICOS/FSW (April 06) LATTE (‘05) Moving from ACD- only to full LAT seems to have increased the noise in the TCI runs and slightly affected the goodness of fit This is just more scatter in the points, not non- linearity One Entry Per PMT

TCI to Veto Mapping GSFCSLAC TVAC LICOS/FSW (April 06) LATTE (‘05) One Entry Per PMT Many channels changed about 8-10% with LICOS (also changed hitmap_delay) The NA channels changed by up to 50%

Muon Run Test Phases Reference is Jan. SVAC runs Block 1 (04/04 – 04/18) Both Veto Drivers Enabled -> small Voltage FE (~3.2V) 10 “sub-blocks” of runs (~ 10 M events) each LAT-7xx and B-31 runs Block 2 (04/20 – 04/26) Single set of Veto Drivers -> FE voltages close to nominal (3.3V) 8 “sub-blocks” LAT-7xx runs Block 3 (04/27 – present) Using veto settings and zero suppression values from veto scan done on 04/26 2 “sub-blocks” as of 04/28 Sub-block 1 is ACD triggered.

PHA Pedestals from muon runs Reference is Jan. SVAC B-13 runs The first block of muon runs were taken with both sets of veto drivers enables. This caused a voltage sag which affected the pedestals, esp. on the GAFE 17 channels One Entry Per PMT

Muon Peak positions Block 1Block2Block3 Two of the subsets were taken with the LAT on its side Many of the tiles had limited statistics & poorer fits One subset was taken w/ the ACD only allowed to trigger the LAT. Tiles not used in the trigger have low statistics & poor fits One Entry Per PMT

Summary Tools in place to trend ACD performance All basic quantities being tracked Some cross checks should be implemented Online v. Offline Pedestals, Veto Offset, Slope Most features of trending analysis understood Hitmap & Hold timing ok Pedestals ok, both online & offline Depended on FE TCI  PHA mapping ok Depended on trg_seq setting TCI linearity got worse on LAT, but steady since install TCI  Veto mapping changed w/ LICOS / FSW runs Still need to understand this Muon MIP peaks very steady