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 23:15:22 2024 Author*: Type: - please select - Routine Other Category: - please select - General Other Subject: <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;">Mike Bentley wrote:</td></tr> <tr> <td cellpadding="10px" style="background-color:#FFFFB0;"><p>&nbsp;All ran smoothly.</p> <p>As a test, ran for a short period at 1200 midday to run without S2-2 in the trigger. Finished that at 1339.</p> <p>After discussion with Alison, Alex, Brian, Chris - we decided to change energy to 3.98 MeV/u. This started at 1340.</p> <p>Pumped out H2, Marco steered with low intensity beam. He optimized on our PD2 with the 3mm collimator, then he observed the spot on the scintillator. He believed (as do I) that it looked as good as it did after the high-intensity tune yesterday. Beam spot blown up a bit, as before, but very well centred. picture from iphone below.</p> <p>Did a run without gas, then filled, then got going on H2. H2 run started 1730. Thus, 4 hours for beam change and low-intensity tune.</p> <p>Did analysis of rates/triggers with and without gas - all with 100 epA</p> <p>&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WITHOUT GAS &nbsp; &nbsp; &nbsp; &nbsp;WITH GAS</p> <p>S2-2 all &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 3000 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3800</p> <p>PD &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 1500 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;1900</p> <p>Coincidence &nbsp;10 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;1800&nbsp;</p> <p>S2-1 all &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 13000 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 57000</p> <p>The trigger (7000 ish) is a sum of the first three of course. Interesting that all the coincidences are gas-&quot;related&quot; - which is good I think. It confirms to me that we should consider, at some point, running on only coincidences in the trigger to cut down the dead time (currently 60% live, 40% dead)</p> <p>that's it. Jamie checking the spectra, if nothing else in this e-log then they are ok.</p> <p>Sort started on new data, will run it overnight and compare in the morning with the old sort.</p> <p>Mike</p></td> </tr> </tbody> </table> </p><p> </p> Encoding: HTML   ELCode   plain   Suppress Email notification Attachment 1:

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