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Operations team: Maurice Garcia-Sciveres, Katie DunnDunne, Su Dong
Maurice's CMOS sensor shipped to SLAC from Sensor Creator's Inc directly. A 'camera' like standalone readout unit connecting the sensor via a thin flex. Beamline support scheme worked out with Matt McCulloch with CMOS sensor taped behind the 94-04-03 double chip FE-I4 module. Vertical readout chain to allow easy rotation. Ethernet port address 192.168.2.1. |  |
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- 19:06 started run 333 with LUB1 @ 1.1KV HV (leakage current 170uA) and DUT pixel rate ~70, but MIMOSA is only capturing the top half of the beam spot to allow the beam just catching the bottom part of the DUT. DUT beam window 'X'=5-30; 'Y' almost full span. MIMOSA beam window X=100-700; Y=0-160 (clipped at Y=0).
- 19:44 another run 335 with the same conditions.
- Attempted another 1500e tune for LUB1 following Martin's suggestion to skip the Noise Scan at step 13 but the process stumbled at step 16 for Noise Scan again, exactly the same way. So have to continue with the 2000e config.
- Raise HV to 1.2KV and every still looked benign with leakage current ~180uA.
- Just as we started to config, some major glitch took place ~9:40pm and entire Caladium stage control/ADC/temperature etc in an error state that never self-recovered. All temperature, HV readings became unavailable and Caladium stage also became uncontrollable. Rebooted IOC but didn't make any difference.
- We did not realize the seriousness of the Caladium control loss and went ahead lifted out the DUT and turned it to 90 degrees to beam after quite a bit if trouble.
- Reconnecting DUT also had trouble with readout error again. Upon playing with the LV power on sequence, it was noticed that the BK precision LV PSU went into a spontaneous chaos mode with displays flickering and numbers fluctuating and even partial screen blackout. This may well be the source the various readout flakiness.
- After waiting for 1-2 hours, the HV current went down enough to allow HV setting to go up to ~700V but current ~500 uA still fluctuating a lot and couldn't settle. Don't know what temperature this was. Dry ice is rather low and doesn't look like temperature can help this much from here on.
- Too many things telling us it's time to quit: Flaky LV PSU and readout errors, unsettling HV, broken Caladium drive and display, and we are out of dry ice. Dismounted the cold box from Caladium and placed the LUB1 in the ESA freezer together with LUB2.
- Concluded the day with just two good tilted runs with LUB1 @ 1.1KV.
- The temperature time history below for July/16 showing initial blue=probe tied to DUT Cu tape, green-cold box gas. The step at t=-5 hours is the big glitch that took out the Caladium drive/display.
The newly installed Caladium ADC for the HV Vset and Imon: The green leakage current mon is roughly calibrated to the HV module's LEMO mon socket claimed of 1V=1mA. The blue Vset calibration was a bit strange which showed -0.75V for -1KV. Glitch at -5h made Caladium stage control into permanent error state, all values after that were invalid. 
Jul/18
Operations team: Katie Dunne, Rebecca Carney, Su Dong
- The Caladium stage readout storm from Saturday was resolved by Doug McCormick. The solution was to just power cycle the stage control box. Sometime rebooting the IOC can help also but that was already tried by guessing on Saturday which didn't work. Other than physically unplug the stage power, one can also do this power cycle by remote control from AC Power->SCS3: B061 Tunnel->Bank 3 chan 23 "beckhoff 26".
- Doug turned the Caladium Y-fine stage drive current from 1A to the max of 3A and verified it can now drive ~50kg.
- We reinstalled the small rotation stage with the double chip FEI4B module 93-04-03 and verified the fine stage drives are now all functioning.
- Worked with Mike Dunning on the two HV monitoring ADC lines. The Vmon line is moved from KL3132 to KL 3404 together with the Imon so that KL3404 now has Chan01=HV-Imon; Chan02==HV-Vmon. Also adjusted the scaling factor for Vmon so that it has a slope=1.12 which gave identical reading between the Voltmeter and EPICS physical value for Vmon=-618mV (HV=-618V). At very low Vset the two differ somewhat probably due to some small offset but this is unimportant for higher HV range.
- Powered on the double-chip module with LV=1.5V; HV=-80V. Tried calibration but initially chan-0 not working but chan-1 worked. Swapped data cables between the two channels and then both channels worked (bad connection the first time?).
- Tried to bring up full EUDAQ readout MIMOSA DAQ panel got "ErrorConfig Socket" stuck red. Repeated normal startup sequence could not clear it. Resorted to go in the NI windows command line with a shutdown -r to reboot. Upon restart, the error cleared and everything back to running state. There should be a hardware reset for MIMOSA somewhere that shouldn't need to reboot the crate ?