07:20

Started a background run while the cave is open.

All ASIC settings remain unchanged, we just have no beam.

We see obvious difference in the rate plots for DSSD2 from the monitoring code. Attachment 1 - beam on, Attachment 2- beam off.

Data rate ~1.6 MB.sec

Checks OK.

10:30

Lost DSSD4 again. Writing a lot of junk to disk.

Switched to MEC channels. Still writing lots of data. Stopped the run.

Required ASIC check load on aida13,14,15,16 in order to bring rates back down.

Slowly re-biasing detector. At 35V

Moved detectors fully out for safety. Left potentiometer = 18.86 mm and right potentiometer = 19.8 mm. No effect on leakage currents.

Past 40V we large increases in leakage current. Only went up to 10uA and didn't trip. Set to 40V, current back down to normal levels.

Note we have turned the target compressor off to heat up before cooling later to try and get higher densities. This follows a drop in E1 yesterday reducing the target density.

10:45

Started new background run - Run 69.

DSSD4 set to MEC.

Thresholds still as in previous runs (120, 80, 80 keV).