Run 41 started.

D+ beam deuterium target. D+ beam energy is 0.75 MeV/u. (beam calc calculation is 0.7619 MeV/u). See previous entry for beamcalc.

Beam calc - Attachment 1

Target density is about 3e12 at/cm2

All four detectors positioned fully out and stationary.

Left potentiometer = 18.86 mm

Right potentiometer = 19.8 mm

Ring cycle time is 25 seconds. Note we see some hydrogen in in the spectrum, this disapears after a few seconds.

Target T1=30.0K, T2=31.9K.

Nozzle position x=-2.96, z=1.72 mm

YR09-Etarget pressure = 2.0e-10 mbar.

Cooler set value = 439 V, 15 mA. Read value = 439.81 V, 12.88 mA

All leakage currents look good

Beam position. Vertical =0.0mm , Horizontal=-1.5 mm

Beam intensity ~3e8 on bunched beam, 3e8 on coasting. Gleb has increased the intensity this morning.

Data rate ~ 403kB/s

Lowered slow comparator threshold to 0x24 (360 keV)

13:20 Run stopped

Wolfgang tuning next beam energy

All checks fine

Total stats: 7827,4085,1821

OFFLINE CHECK

I have check Run41 and applied the gain calibration from 2024 in addition to a tigher EyEx energy cut (600 keV from 3 MeV for the online script). We no longer see the larger hump to the side of the 3He peak in DSSD1. See final attachment for comparison.

Note no time cuts have been applied to this spectra.and a more rigourous gain calibration using the igher energy D+ runs will likely improve things further.