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- 09:30 FE65-P2: An analog scan looked pretty bad at first:
- 09:30 FE65-P2: ran tune_globalthreshold and tune_pixel threshold and got okay results from an analog scan:
- When running YARR we get an error for each scan: ERROR # virtual void Fe65p2DataProcessor :: process() : Received data for channel 1 but storage not initialized!
- 09:42 We have beam, are current calibrating LUB2 using config_rad_np_0_271
- 10:10 started run 649 with config SLAC_LUB2_with_FE65P2 and YARR producer; currently blasting us with 400 hits per plane TA = -35C TP = -43C; events wouldn't build so restarted RCE/Mimosa, etc.
- 11:03 stopped run
- 11:34 Run 650 TA = -31C TP = -43C Moved DUT back up 4mm to sit in area that avoids dead pixels. After running for about 1600 hits this was actually a worse position so repositioned back -4mm
- Apix is not showing as many hits as all other mimosa planes, even those behind the DUT. We tried using the previous config from yesterday, didn't improve things. For the July testbeam the LV was set to 1.5V with 0.33 and for this run we had 1.2V.
- 12:37 Considered RCE couldn't handle the high particle rate so we asked MCC to lower to ~20 electrons. Did not improve things. Requested an access so we could increase the LV to 1.4, top off the dry ice, and check to make sure we were still in the beam.
- 13:13 Run 656 The first run the telescope had about 300 hits per event while DUT had 4.5. After the access the telescope sees 21.5 and the DUT sees 1.9. The mimosa has different pixel size (2) so accounting for that the number of particles the telescope sees is 10 per pulse and the DUT (with cluster size 1) sees 1.9, so this ration is in the same order of magnitude. Pixel ToT distribution is lower than yesterday's
- 13:40 Tried retuning LUB2, did not improve ratio of hits per event of Mimosa/DUT - still about 11/3
- 15:00 Retuned Run 658 -> TOT still doesn't look great
- 16:35 Access to monitor leakage current, turns out the HV current was at compliance. It was tripped at 400V, so all runs today were without HV operating. Changed the current limit and set up a camera to monitor HV and leakage current
- 16:50 started run 662 at 400V. Planning to run 10 minutes at a time in 100V 200V increments