ELOG CARME

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

CARME

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Wed Feb 14 14:59:13 2024

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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.&nbsp;

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)&nbsp;&nbsp;&nbsp; Counts

2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 148

3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 200

4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 178

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Target-overlap-scan-optimized.pdf Original size: 842x595

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