ELOG CARME

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

CARME

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Entry time:

Sat Jun 1 07:16:15 2024

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Morning shift

08:16 - as run 18, target off

9:00 Increased storage time to 5 minutes. Aquired data after initial beam loss. Attach 1 &amp;2. Far less H2+ vs D.

Temps OK

Rates as before

10:00 beam being optimised to reduce 2H+ content

Rates in aida 13, 14 suddenly spike as during overnight. Checkloaded repeatedly. No effect. Increased thresholds in 13, 14 to 0x32 bringing them in line with 15,16.

12:50

We started test with beam

Test1 ( Attached 12-52-55)

Horiz. offset: 8mm

Max vuel on 1.5MeV =1480 counst

Test2

Horiz. offset: 7mm

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Test3

Horiz. offset: 6mm

target density=2.4E11

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Test4

Horiz. offset: 5mm

target density=from 1.7E11 to 2.5E11

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Test5

Horiz. offset: 4mm

target density=from 5.6E11 to 1.1E11 several fluctuations

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Test6

Horiz. offset: 3mm

target density=1.1E11 several fluctuations. Until now we do not see a clear&nbsp; signel from the reaction!

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Test7

Horiz. offset: 2mm

target density=1.1E11 several fluctuations.

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Test8

&nbsp;Beam back again. Coasting beam. Detectors IN

Horiz. offset: 8mm

xy and energy histograms - attachment 12 and 13.

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Test9

Bunched beam Detectors IN

Horiz. offset: 8mm

xy and energy histograms - attachment 14 and 15.

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Test10

Horiz. offset: 6mm

xy and energy histograms - attachment

target:1.6E11

xy and energy histograms - attachment 16 and 17.

Afternoon shift

From previous overlap tests we can see that moving the beam position does cause a change in the number of events observed in the detectors.

But the change in events appears to be due to beam halo hitting the detectors rather than elastic scattering. New approach required.

We have varied the beam position (horizontal) in 1mm steps from 0mm to 9mm (the maximum allowed). We do this with the target ON and then with the target OFF.

Integral of events ~1.5 MeV taken . Difference between the target and no target plotted to gauge overlap position.

Note we have moved left arm fully out as we were worried about beam hitting dssds on injection. Will check overlap with right dssds only as left dssds have very low rate at this position.

We have determined the overlap position is about 7.0mm horizontal

Attachment 18 shows initial scan.

Attachment 19 shows a second scan in the region we highlighted as possible overlap.

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