Tuda logbooks General E1104 ISACII E1195 E1103 E1147 S1287 S1203 S1233 S1284 S1447 23Na(a,p) S1540 S1381  S1847 Catania

S1287

Fields marked with * are required Entry time: Thu Nov 14 23:43:59 2024 Author*: Type: - please select - Routine Other Category: - please select - General Other Subject: <p>Plan for shift was to increase trigger thresholds on S2-1 and S2-2 to cut out the low energy &quot;stuff&quot; which is dominating our trigger rate, and preventing us from increasing the beam current. S2-1 thresholds were at 10mV and S2-2 at 25 and 30mV.<br /> <br /> Increased all S2-2 thresholds to 30mV and took runs with S2-1&nbsp; at 11, 15, 20 and 40mV. Trigger rates seem unaffected. Low energy peak in S2-1 spectra are unaffected, however the bump at chn. ~380 was shifted up as threshold increased.<br /> <br /> Looking at energy-energy spectra from sorted data, see lots of events at very low energy (y axis), across all channels (x-axis).<br /> <br /> Concluded that the low energy peak is real coincidence, so can't be removed by increasing trigger threshold (as it is in coincidence with stuff in S2-2), and the &quot;bump&quot; is singles, so is being cut out as thresholds are increased.<br /> <br /> Not clear whether the low energy peak is reactions, or something else, but the result is we can't increase the thresholds to cut the rate and allow the beam current to increase.</p> <p>&nbsp;</p> <p>Following discussions with Brian, the interpretation of this may not be correct.</p> Encoding: HTML   ELCode   plain   Suppress Email notification Attachment 1:

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