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 Apr 5 00:42:59 2025
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<p><strong>Morning shift</strong></p> <p>08:16 - as run 18, target off</p> <p>9:00 Increased storage time to 5 minutes. Aquired data after initial beam loss. Attach 1 &2. Far less H2+ vs D.</p> <p>Temps OK</p> <p>Rates as before</p> <p>10:00 beam being optimised to reduce 2H+ content</p> <p>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.</p> <p><strong>12:50</strong></p> <p>We started test with beam</p> <p>Test1 ( Attached 12-52-55)</p> <p>Horiz. offset:<strong> </strong>8mm</p> <p><strong>Max vuel on 1.5MeV =</strong>1480 counst</p> <p>Test2</p> <p>Horiz. offset:<strong> </strong>7mm</p> <p> </p> <p>Test3</p> <p>Horiz. offset:<strong> </strong>6mm</p> <p>target density=2.4E11</p> <p> </p> <p>Test4</p> <p>Horiz. offset:<strong> </strong>5mm</p> <p>target density=from 1.7E11 to 2.5E11</p> <p> </p> <p>Test5</p> <p>Horiz. offset:<strong> </strong>4mm</p> <p>target density=from 5.6E11 to 1.1E11 several fluctuations</p> <p> </p> <p>Test6</p> <p>Horiz. offset:<strong> </strong>3mm</p> <p>target density=1.1E11 several fluctuations. Until now we do not see a clear signel from the reaction!</p> <p> </p> <p>Test7</p> <p>Horiz. offset:<strong> </strong>2mm</p> <p>target density=1.1E11 several fluctuations.</p> <p> </p> <p>Test8</p> <p> Beam back again. Coasting beam. Detectors IN</p> <p>Horiz. offset:<strong> </strong>8mm</p> <p>xy and energy histograms - attachment 12 and 13.</p> <p> </p> <p>Test9</p> <p>Bunched beam Detectors IN</p> <p>Horiz. offset:<strong> </strong>8mm</p> <p>xy and energy histograms - attachment 14 and 15.</p> <p> </p> <p>Test10</p> <p>Horiz. offset:<strong> </strong>6mm</p> <p>xy and energy histograms - attachment</p> <p>target:1.6E11</p> <p>xy and energy histograms - attachment 16 and 17.</p> <p><strong>Afternoon shift</strong></p> <p>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.</p> <p>But the change in events appears to be due to beam halo hitting the detectors rather than elastic scattering. New approach required.</p> <p>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.</p> <p>Integral of events ~1.5 MeV taken . Difference between the target and no target plotted to gauge overlap position.</p> <p>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.</p> <p>We have determined the overlap position is about 7.0mm horizontal</p> <p>Attachment 18 shows initial scan.</p> <p>Attachment 19 shows a second scan in the region we highlighted as possible overlap.</p>
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