AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
CARME
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Mon Aug 18 11:10:12 2025
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<p> <table width="98%" align="center" cellspacing="1" style="border:1px solid #486090;"> <tbody> <tr> <td cellpadding="3px" style="background-color:#486090; font-weidht:bold; color:white;">Quote:</td></tr> <tr> <td cellpadding="10px" style="background-color:#FFFFB0;"><p>Target density this morning had stabalised at 7e11 at/cm2</p> <p>This is sufficient to test the beam/target overlap using the lifetime of the beam in the ring.</p> <p>Previous attempt at this method was done at 1.5e11 at/cm2 where lifetime from residual gas and target are essentially the same.</p> <p>Beam set to bunched. Beam position varied by 1mm and the number of particles in the ring taken from Grafana plots. Particles at injection compared with at dump.</p> <p>Significantly more beam loss at > 8 mm beam position with highest value at 8.75 mm. This is the maximum we can move the beam.</p> <p>Test repeated with no target. Same beam loss rate for all positions. We see a clear difference with the target only at positions > 8mm.</p> <p>Test repeated with original electron cooler voltage Gleb tuned with last night. Same outcome -> cooler voltage has no significant impact on overlap (for 0.1V at least)</p> <p>Overlap using count rate over 7.5 minutes also tested. DSSD 1 (top right) used as gauge as no beam stripe is seen in this detector. </p> <p>At horizontal position 4 mm (previous estimation of overlap) we saw a small increase in counts around 4.7 MeV with the target off compared to target on (76 vs 57)</p> <p>At horizontal position 8.75 mm we saw a large decrease in counts around 4.7 MeV with target off compared to target on (95 vs 290)</p> <p>It appears clear the overlap is at 8.75 mm. Future runs will use this as horizontal beam position.</p></td> </tr> </tbody> </table> </p><p> </p>
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