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</style><article id="node-1185211" class="node node-logentry contextual-links-region article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/4112174" rel="bookmark">RC Update - Wednesday Jan 18, 2023</a>
</h1>
</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/4112174/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/4112174/delete?destination=email/send">Delete</a></li></ul></div>
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Lognumber <a href="https://logbooks.jlab.org/entry/4112174" class="lognumber" data-lognumber="4112174">4112174</a>. Submitted by <a href="https://logbooks.jlab.org/user/bduran">bduran</a> on <time datetime="2023-01-18T09:28:26-0500" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1674048506&end_date=1674055706&book=HCLOG">Wed, 01/18/2023 - 09:28</a></time>. </p>
<p class="last-update">
Last updated on <time datetime="2023-01-18T09:30:03-0500" pubdate="pubdate">Wed, 01/18/2023 - 09:30</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>bduran</td></tr></table></div>
<div class="logentry node-content">
<p><strong>*** IMPORTANT INFORMATION FOR SHIFT TAKERS: </strong></p><p> </p><ul><li><strong>Make sure your trainings including the RWP are up to date and successfully updated on the system. Please take some time to make sure your badge is active and allows you to pass the security.</strong></li></ul><p> </p><ul><li><strong>JLab requires wearing masks in public areas due to COVID-19 Community Level increases in the area. Please remember to wear a mask in the counting house.</strong> </li></ul><p> </p><p> </p><p><strong>Yesterday RC Update: </strong><a href="https://logbooks.jlab.org/entry/4111639">https://logbooks.jlab.org/entry/4111639</a></p><p> </p><p><strong>Tuesday, Jan 17th Day Shift:</strong></p><p> </p><p>- Around 9 am - beam is taken away to perform some studies/tests to improve on beam trips and inability to provide high current to Hall A and C simultenously <a href="https://logbooks.jlab.org/entry/4111393">https://logbooks.jlab.org/entry/4111393</a>.</p><p> </p><p>- 10:30 am - still no beam. MCC starts doing some RF stress tests with high current. Target was moved from 3He to 12C for this.</p><p> </p><p>- 12:30 - Crew chief calls to notify that they want to send 70 uA on carbon target for the RF high power delivery tests. Current beam authorization has been updated to accomodate this <a href="https://logbooks.jlab.org/entry/4111547">https://logbooks.jlab.org/entry/4111547</a></p><p> </p><p>- 14:30 - RF high power delivery test is complete. The shift crew switched back to 3He target and resumed data taking at 40 uA (max allowed current of He targets currently) at setting 1 of high Q2 HMS seeting (HMS momentum -4.08 GeV and angle 35 deg) and SHMS settings of -9.2 GeV and 10 deg.</p><p> </p><p><strong>Tuesday, Jan 17th Swing Shift:</strong> </p><p> </p><p>- Finished 3He and dummy running at the same kinematics and switched to 4He.</p><p>- Beam current was dropped to 30 uA for the last 2 hours to reduce the beam trips.</p><p> </p><p><strong>Wednesday, Jan 18th Owl Shift:</strong> </p><p> </p><p>- Finished the 4He running at setting 1. (We are finally done with setting 1!!!)</p><p>- Changed the HMS momentum to -3.57. HMS angle (35 deg) and SHMS kinematics (-9.2 GeV and 10 deg) remain the same. Resumed data taking with 4He target at the new HMS momentum setting.</p><p>- Owl shift crew mostly run with 30 uA and 35 uA to reduce the beam trips while Hall A beam current was kept at 40 uA. </p><p>- Shift crew reported SHMS HB valve 3 being red and warm LHe temperature is lower than expected <a href="https://logbooks.jlab.org/entry/4111953">https://logbooks.jlab.org/entry/4111953</a>. Heidi might be able to check the temperature sensor during the opportunistic hall access today.</p><p>- Beam was taken away at 7:30 am today for the accelerator maintanance.</p><p> </p><p><strong>Wednesday, Jan 18th Day Shift:</strong> </p><p>- Maintanance day! Beam is off and the plan is to lock up around the end of day shift.</p><p>- We will have an opportunistic access. RadCon will sweep the hall at some point before noon after they are done with supporting the linacs.</p><p>- During the access:</p><ul><li>Hall C walkthrough</li></ul><ul><li>SoLID test by Jimmy Caylor et al</li></ul><ul><li>(Maybe) Checking the HB temperature sensor and ice accumulation on the SHMS by Heidi.</li></ul><p> </p><p>PLAN:</p><p>- When beam is recovered, we will keep taking production data on 4He at setting 2 of HMS high Q2 35 deg running and SHMS kinematics -9.2 GeV and 10 deg. We will also take data on Al dummy, 3He, and 12C targets at this setting.</p><p> </p><p>RC Meeting today at 11 am to briefly discuss what we have done so far and what the plans are for the next week:</p><p> </p><pre style="font-family: monospace, Courier; background-color: #f9f9f9; border: 1px solid #dddddd; padding: 1em; white-space: pre-wrap; line-height: 1.1em; font-size: 12.699999809265137px;">Join ZoomGov Meeting
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