Run 27 Started to check optimsation of the beam - target overlap.
Beam intensity at injection is roughly 1e7 particles
Target density apporx 4.2e11 atoms/cm2 and stable.
Ring pressure is below 1e-10 mbar for all ring sections and stable
First optimisation procedure was to vary the horizontal beam position and see the effect on the count rate in detector #0 (top left) (see elog 509). Beam position was scanned from -9 and -4. Attachment 1 shows the maximum in count rate around the -7.5 position.
Second optimisation procedure was to change the time ions are allowed to circulate in the ring before being dumped. The count rate over 5 minutes in detector #0 (top left) at ~20 MeV was used as a gauge. This is the only part of the cycle we can control.
Time (s) Counts
2 148
3 200
4 178 |