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- 8am MCC meeting clarified that the ESA search is probably going to be 11am-noon, not the originally hoped 9:30am. We declared ready to run right after ESA search. It was brought up that a few weeks ago some ESA user from Japan brought in an irradiated sample without declaring to RP which caused quite some disturbance that even temporarily shutdown the ESA operations. Lia's question on this caused a major overhaul that required us to send updated participant list, and TestFac experiment review form and RP in person interview etc. before getting approval to start at ~2pm.
- 13:00 - ESA search has been completed and the cave is now set to controlled access.
- DUT stage fine adjustments brought DUT aligned with Caladium MIMOSAs, and whole telescope moved horizontally into the beam line.
- RTISC2B appears have gone into very strange state and cannot be calibrated even after removing the rough taping. Brought in RTISC4A to replace it and sensor window properly taped. Threshold calibration runs but the noise rather high at ~400e, with some systematic structure also. Suspected bias voltage and seems to measure 0V on the HV ch-0 used. Switched over to ch-1 can at least drive the voltage up. Maurice concerned that the leakage current seemed a bit high >>few uA for very small starting bias voltage. However, cranking up to -53V (these Micron 300um sensors actually need -80V to deplete) didn't bring much more leakage current to settle at 4uA. Left at this setting to try to run. Sergei managed a standard 3000e tune with nice narrow dispersion. The noise is still high at ~400e. Also checked the various grounds and decided we can leave the HSIO2-PSU ground hook off since the HSIO-FE cable is now proper CAT6 with ground. This didn't make any difference. Decided to just take this tune as running config (RTISC2B__cern__25.cfg) - calib directory stayed with RTISC2B but this is really RTISC4A.
- Tried EUDET ni_autotrig runs but somewhat confused by the behavior: without starting up the TLU producer, the autotrig setup actually runs with event build flowing and histograms in monitoring updating, although trigger/particle counts remain 0. When added the TLU producer, particle counts still go up but no trigger and no event build.
- 18:05: Carsten called and informed us about the delay. The people before us wrapped Al foil around the emergency buttons which of course upset a lot of people. They stopped ESTA operation until it is resolved, which should be in the next hour.
- Beam finally arrived ! We don't seem to get any trigger. Decided to ask for access to look at the trigger and change RTI sensor HV control at the same time. One problem with trigger quickly found: the Caladium Date Reducer box data link to TLU was misplaced on the Data Reducer box side to the port right next to the 6 MIMOSA data cables, but it really should be plugged into the channel at the far end. Fixing this resolved the TLU producer anomaly above.
- The remote control to the HV in the NIM crate (the orange one in the middle) now works via the KB 9130 power supply. There is a panel in the epics for T-542 for controlling the low voltage. The granularity is pretty good - by setting 0.08 V (=80 V in HV), we get 0.086 measured (and displayed on the monitor). The only problem is that the current is in A so we can't monitor it (need to change to uA). Should ask Mike tomorrow during the day for help with the quick fix.
- After we moved HV control and set voltage -53
- Upon restart with beam, we still don't get the beam triggers, although auto trigger runs with TLU now works correctly.
- 21:19: Accelerator shift change, beam energy changed and was off for 20min, back now. Will take access to investigate trigger problem.
- ESA access again to examine the beam trigger. Traced the trigger cable from the DUT rack to the patch panel area and placed a yellow tag on it. It is connected to the row of BNC plugs saying "To B061-01-06" socket J5. Brought scope to the DUT rack and placed a BNC T on the trigger cable to check it on the scope by moving over the rack top camera. Upon restart with beam, we saw from the camera that there are blips of pulses at ~5 Hz as expected and negative polarity as expected from NIM but the pulse height is much lower than the -1V NIM. We though the trigger signal might be available at the counting house but the "beam spill" plug had nothing on it. Toggling the trigger panel channel #10 SiTrack- Caladium Enable on/off one can see the 5 Hz blip goes on/off together with it which suggests the trigger is still hooked up to the right channel but too low an amplitude for the TLU box. Couldn't make much progress without Mike.
- Decided to quit for the night and reconvene tomorrow when Mike Dunning is around.