<div dir="auto"><div dir="auto">Dear Colleagues,</div><div dir="auto"><br></div><div data-smartmail="gmail_signature" dir="auto"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr">This is a courtesy reminder of our today's RC meeting at 11:30 AM in CH Room 200C and ZOOM; see its connection info in yesterday's message below. Due to network issues JLabwide, I lost my RC summary. I hope the issue will resolved before the meeting as currently we can't connect to the external world. <br><br><font size="2"><span style="font-family:arial,sans-serif">Best,<br><br>Lamiaa<br><br></span></font><div dir="ltr"><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div><div class="gmail_quote gmail_quote_container" dir="auto"><div dir="ltr" class="gmail_attr">On Mon, May 19, 2025, 9:22 AM Lamiaa El Fassi <<a href="mailto:elfassi@jlab.org">elfassi@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div class="gmail_default" style="font-family:tahoma,sans-serif">Dear Colleagues,</div><br clear="all"></div><div><div class="gmail_default" style="font-family:tahoma,sans-serif">This is a friendly reminder of our RC meeting this morning at CH Room 200C and online in ZOOM; please see its connection info below. </div><br></div><div><div class="gmail_default" style="font-family:tahoma,sans-serif">The RC summary of the last 48 hours is enclosed below and can be accessed at <a href="https://logbooks.jlab.org/entry/4377310" target="_blank" rel="noreferrer">https://logbooks.jlab.org/entry/4377310</a>.</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"><br><font size="2"><font face="arial, sans-serif">Best,</font><br><br><font face="arial, sans-serif">Lamiaa</font></font></div></div></div></div></div></div></div></div></div></div><div class="gmail_quote"><br><div>
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<a href="https://logbooks.jlab.org/entry/4377310" rel="bookmark noreferrer" target="_blank">RC Summary for May 17th - 19th</a></h1>
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This is the RC Summary of the last 48 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>11:30 AM EDT </b><br>
Location: <b>CH Room 200C and online via ZOOM </b><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=xvIrZb1p8HoRayKD1Sz8zPzqi4-qHfiBCWqgj3oMbOQ&m=OKTAzr5tBVt2fgIrfGfD54K27sjwzUOC2DsF4kJRloMjwLz67DEee9_S5U0-1DLw&s=02CDfzxjD-fdFxEzE5bmMqjaW-ZPBJaMbodMRPXGGIg&e=" target="_blank" rel="noreferrer"> 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" rel="noreferrer"> Day Shift </a> </b>=============================<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" rel="noreferrer"> 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" rel="noreferrer">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 20<sup>th</sup> Owl Shift </b>=============<span class="gmail_default" style="font-family:tahoma,sans-serif"></span>====<br>
- <span style="color:red"> <b> All shift<span class="gmail_default" style="font-family:tahoma,sans-serif">s</span> are canceled! </b></span> <br><br>
===========================<b> May 20<sup>th</sup> Day Shift </b>=============================<br>
- <span style="color:red"> <b> A shift is on standby </b></span><span class="gmail_default" style="font-family:tahoma,sans-serif">since</span> MCC plans to investigate our beam quality issues, as announced today, Monday, May 19<sup>th</sup>, <span class="gmail_default" style="font-family:tahoma,sans-serif">in their</span><span class="gmail_default" style="font-family:tahoma,sans-serif"> morning</span> 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" rel="noreferrer">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 run ends <br><br>
=============================<b> Run Summary </b>=============================<br>
- None; no beam! </div>
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