<div dir="ltr"><div><div class="gmail_default" style="font-family:tahoma,sans-serif">Dear Colleagues,</div></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><span></span></div></div></div></div></div></div></div></div></div></div><div class="gmail_quote gmail_quote_container"><div class="msg-1242972464530430034"><div id="m_-1242972464530430034mimemail-body"><div id="m_-1242972464530430034center"><div id="m_-1242972464530430034main"><div class="m_-1242972464530430034date-vitals"><br>
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This is the RC Summary of the last 24 hours starting from the day shift of Sat., May 17<sup>th</sup>, 2025 <br><br>
=============================<b> Daily RC Meeting Info </b>==========================<br>
Time: <b>No Meeting on Sunday<span class="gmail_default" style="">,</span> May 19<sup>th</sup></b><br>
Location: CH Room 200C and online via ZOOM <br>
ZOOM URL <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1605705819-23success&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=E9temI25vZoSfrwaoVr2jw&m=z8XFrTkHlZl61rEWBdiPkGBwlH0ZAe2eHRcQx9iNNyjRZXB_kG0Tg_n_f6Cn6RD1&s=LWpZOrVIrjlQaAFLAffqK2CxXiZxe-RNvzMXvWhb3C0&e=" target="_blank"> link</a> (including passcode) <br>
ZOOM meeting ID: <b>160 570 5819 </b><br>
=============================<b> May 17<sup>th</sup> <a href="https://logbooks.jlab.org/entry/4377085" target="_blank"> Day Shift </a> </b>==========================<span class="gmail_default" style=""></span>===<br>
- The shift started with beam off based on the high-level decision to suspend Hall-B beam operation due to the inability to keep our beam halos happy due to the 80s beam oscillations, beamline scrapping, bleedthrough, etc., as discussed in yesterday's <a href="https://logbooks.jlab.org/entry/4377255" target="_blank"> RC summary</a>. Then, based on the 9 AM RC/PD meeting's discussion, they decided to dedicate ~ 3 hours of beam tuning to debug the Hall B issue by altering the vertical separator. Expected update by noon EDT. <br><br>
- Around 11:30 a.m., the crew chief called, stating the work was done, and they were ready to start tuning low beam current to our FCup starting from 5 nA while watching FSDs. Starting at 5 nA was OK, but as soon as ramping up the beam current to 50 nA, FSDs started tripping again and drawing high rates, even when a beam is OFF due to a bleedthrough or scrapping something upstream our beamline; see, e.g., this <a href="https://logbooks.jlab.org/entry/4377217" target="_blank">BEAM Overview Scalers at 50 nA</a>. As a result, the MCC decided to cease tuning us beam and focus on other halls, at least until tomorrow's PD/RC meeting. For that reason, all shifts have been canceled until the Sunday day shift, whose shift takers are on standby! <br><br>
===================<b> May 17<sup>th</sup> Swing Shift thru May 19<sup>th</sup> OWL Shift </b>==============<span class="gmail_default" style=""></span>===<span class="gmail_default" style=""></span><br>
- <span style="color:red"> <b> All shift<span class="gmail_default" style="">s</span> are canceled! </b></span> <br><br>
==========================<b> May 19<sup>th</sup> Day Shift Onwards </b>========================<br>
- <span style="color:red"> <b> All shift<span class="gmail_default" style="">s</span> are on standby</b></span>! This will be revised after Monday's morning MCC meetings! <br><br>
===========================<b> Game Plan </b>===========================<br>
- Updated <a href="https://wiki.jlab.org/clas12-run/index.php/Run_Group_L#tab=Short_Term_Schedule" target="_blank">Short Term Schedule </a> <br><br>
=============================<b> BTA </b>=============================<br>
- ABU: 342.8 → 342.8 / (68.5 × 24) = 20.85%, <em> as of 05/16 due to beam delivery issues! </em><br>
- Day 43 of 137 scheduled: 43 / 137 = 31.4 %<br>
- BANU: none; no beam! <br><br>
========================<b> Outstanding Major Tasks </b> ========================<br>
- 80s beam oscillations, beamline scrapping, and bleedthrough!<br>
- Faraday Cup vacuum remains elevated — to be addressed after<span class="gmail_default" style=""> the</span> run ends <br><br>
=============================<b> Run Summary </b>=============================<br>
- None; no beam! </font></div><div><font face="tahoma, sans-serif"><br></font></div><div><font face="tahoma, sans-serif">B<span class="gmail_default" style="font-family:tahoma,sans-serif">est,</span></font></div><div><font face="tahoma, sans-serif"><span class="gmail_default" style="font-family:tahoma,sans-serif"><br></span></font></div><div><font face="tahoma, sans-serif"><span class="gmail_default" style="font-family:tahoma,sans-serif">Lamiaa</span></font></div><div><font face="tahoma, sans-serif"><span class="gmail_default" style="font-family:tahoma,sans-serif"><br></span></font></div><div><div style="color:rgb(80,0,80)"><font face="arial, sans-serif" color="#444444">*<span style="font-style:inherit;font-weight:inherit">******************************</span><span style="font-style:inherit;font-weight:inherit">******************************</span><span style="font-style:inherit;font-weight:inherit">**************</span></font></div><div style="color:rgb(80,0,80);border:0px;font-stretch:inherit;line-height:inherit;margin:0px;padding:0px;vertical-align:baseline"><div style="border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;margin:0px;padding:0px;vertical-align:baseline;direction:ltr"><font face="arial, sans-serif" color="#444444"><span style="border:0px;font-style:inherit;font-variant:inherit;font-stretch:inherit;line-height:inherit;margin:0px;padding:0px;vertical-align:baseline">* Assoc. 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