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<a href="https://logbooks.jlab.org/entry/4350051" rel="bookmark">RC Report 07 April 2025</a>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/4350051" class="lognumber" data-lognumber="4350051">4350051</a>. Submitted by <a href="https://logbooks.jlab.org/user/hauenst">hauenst</a> on <time datetime="2025-04-07T12:08:58-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1744038538&end_date=1744045738&book=HCLOG">Mon, 04/07/2025 - 12:08</a></time>. </p>
<table class="field-vitals">
<tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hclog">HCLOG</a></td></tr>
<tr><th>Entry Makers: </th><td>hauenst</td></tr>
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<p>RC Report 07 April 2025 by acting RC Florian</p>
<p>We still have issues with shift takers coming on-site. Tonight shift taker had all trainings but no overnight access to accelerator site. Carlos as RC had to step in so I took over RC responsibility during the day so he can get some rest.</p>
<p>During Day shift yesterday, the GEM experts took data for GEM checkout and the results are good (<a href="https://logbooks.jlab.org/entry/4349469">https://logbooks.jlab.org/entry/4349469</a>). No trips with beam for different HV. During Swing we tried to do LAD timing with the reference bar but we were not fully successfull due to very high rates on the reference bar. We will try again tonight with Cu target for photon peaks in LAD bars. During the Owl shift we switched to delta scan which was just completed. There were initial issues with the spectrometer settings and counting of good events, however, these are solved and were mainly tracked to a kinematics file with wrong values for reconstruction.</p>
<p>Currently, accelerator is doing ARC energy measurement to determine the precise beam energy for later elastic analysis.</p>
<p>Tomorrow at 7am, accelerator will do maintenance and the 3rd pass running for HallC will end. We will be off until Wednesday late day/swing shift due to the commissioning of the updated 5pass separator system (at the moment only HallD can take 5pass beam).<br />
Target Operators (TO) need to report to shifts. Shift leaders at Tuesday Day/Swing and Wednesday Owl are on standby.</p>
<p>RC meeting will be as usual today at 2:30pm in the counting house (<a href="https://logbooks.jlab.org/entry/4346862">https://logbooks.jlab.org/entry/4346862</a>)<br />
<a href="https://jlab-org.zoomgov.com/j/1618227115?pwd=8JkhFg6YNesVc3HNgWjwUSIKIu5SvP.1">https://jlab-org.zoomgov.com/j/1618227115?pwd=8JkhFg6YNesVc3HNgWjwUSIKIu...</a></p>
<p>SHIFT SUMMARIES:<br />
Day Shift: <a href="https://logbooks.jlab.org/entry/4348963">https://logbooks.jlab.org/entry/4348963</a><br />
Swing Shift: <a href="https://logbooks.jlab.org/entry/4349661">https://logbooks.jlab.org/entry/4349661</a><br />
Owl Shift: <a href="https://logbooks.jlab.org/entry/4349658">https://logbooks.jlab.org/entry/4349658</a></p>
<p>RUN PLAN (expected for today, but non stop):<br />
- ARC energy measurement<br />
- Timing measurements until we get clear coincidence peak<br />
- Further GEM alignment data (technically could also be done at 5-pass) with the +/-10cm and +/-5cm carbon optics runs with the GEMs at the 3380V<br />
- Alternative: Luminosity scan with GEMs</p>
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