11:30

Run 50 started.

D+ beam deuterium target. D+ beam energy is 0.35 MeV/u. (beam calc calculation is 0.3577 MeV/u)

Target density is about 4e12 at/cm2

All four detectors positioned fully out and stationary.

Left potentiometer = 18.86 mm

Right potentiometer = 19.8 mm

Ring cycle time is 10 seconds.

Target T1=30.1K, T2=31.8K.

Nozzle position unchanged since end of run 48

YR09-Etarget pressure = 2.05e-10 mbar.

Cooler  Read value = 207.1 V, 4.39 mA

All leakage currents look good (except dssd4, currently stable at V=60)

Beam position. Vertical =0.0mm , Horizontal=0.5 mm

Data rate ~ 172kB/s

Slow comparator threshold to 0x14 (200 keV) since we decreased beam energy.

13:00

All checks OK

We were seeing some rubbish obscuring the 3He peak. JM remembered setting the EYEX cut very high (3 MeV) on the online plot, Now it is reduced to 500 keV

See attachments of histograms before restarting code.
 

16:32 all checks okay
18:19 all checks okay
20:20 all checks okay
21:45 all checks okay

01:00 all checks okay

04:00 all checks okay

7:00

Run stopped - cave to be opened. Beam looks on when run was stopped.

Temps OK - attach

Leakage current stable - attach

Rates OK - attach

Merger OK - attach

Final spectra attached

09:30

Gas target shutter valve closed to save ring vacuum.

All checks OK

Stats at htis threshold with no beam attached.

Biased DSSD4 in steps of 5V from 60V since it has been stable since yesterday,

Was able to bias to 100V with no issues.