10:56

Run 38 started.

D+ beam deuterium target. D+ beam energy is 1.5 MeV/u. (beam calc calculation is 1.5160 MeV/u)

Beam calc - Attachment 1

Target density is about 8.5e12 at/cm2 after moving nozzle this morning.

All four detectors positioned fully out and stationary.

Left potentiometer = 18.86 mm

Right potentiometer = 19.8 mm

Ring cycle time is 1 minute. Note we see some hydrogen in in the spectrum, this disapears after a few seconds.

Target T1=30K, T2=31.9K.

Nozzle position x=-2.89, z=1.72 mm

YR09-Etarget pressure = 2.37e-10 mbar.

Cooler set value = 846V, 15 mA. Read value = 847.378V, 13.105mA

Detector 4 looks OK at the moment.

Beam position. Vertical =0.0mm , Horizontal=2.5mm

11:05

All checks OK

Data rate is ~300 kB/sec.

Leakage currents - attachments 2,3

17:56

Rates have dropped significantly. Do not see elastics peak. No beam?

18:23

Check in with HKR. The thunder and lightning storm appears to have knocked out the beam from 17:30 until 18:10.

Beam is now back with an intensity of 2e8 pps.

I have also adjusted the nozzle of the gas target slightly and recovered target pressure of 1e13 from 3e11 at/cm2. This has been stable for the last 15 minutes. I think during shifts we will require some nozzle modifications. It is not vital at higher energies but for energies during the week, we will need.

We again see the very nice elastic scattering pattern on our detector. I am concerned we may be some shadowing on our detector giving rise to the observed circle? Attachment 5

20:30

Checks all OK

Target density in last 30 mins ~1e13 at/cm2

DSSD4 still looking good and  stable

23:00

All checks OK.

Detectors all stable

Target density still in 1e13 range.

We have accumulated lots of stats! This run should provide an excellent run for energy calibration using elastics and reaction peaks.

We run overnight and change energy in the morning

01:00

All checks OK

Detectors stable

Target density stable 1e13.

05:00

All good still

07:05

Run stopped to change energy. Gas target off.

final statistics plot attached.

Leakage currents overnight also. DSSD4 had two transients during the night but recovered.