[clas_members] [EXTERNAL] RC Meeting on May 20th

[Lamiaa El Fassi]

Dear Colleagues,

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.

Best,

Lamiaa


On Mon, May 19, 2025, 9:22 AM Lamiaa El Fassi <elfassi at jlab.org> wrote:

> Dear Colleagues,
>
> 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.
>
> The RC summary of the last 48 hours is enclosed below and can be accessed
> at https://logbooks.jlab.org/entry/4377310 .
>
> Best,
>
> Lamiaa
>
> RC Summary for May 17th - 19th <https://logbooks.jlab.org/entry/4377310 >
> This is the RC Summary of the last 48 hours starting from the day shift of
> Sat., May 17th, 2025
>
> ===========================* Daily RC Meeting Info *
> ===========================
> Time: *11:30 AM EDT *
> Location: *CH Room 200C and online via ZOOM *
> ZOOM URL link <https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1605705819-23success&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=nhU86tu_xVxwkH2JyhlcQb1jyw6CUjquEwQhqpV3cJI&m=o4fifdRHe1QzeZenChpg_xVkRmj7LZoGxziQ22RJVLe3yXJmlXwImitwJttNZVZv&s=kEL3l2rmlnfgEcHAhO1MwZYKBfePoKTfsvCh9YIFY0Q&e= >
> (including passcode)
> ZOOM meeting ID: *160 570 5819 *
> ===========================* May 17th Day Shift
> <https://logbooks.jlab.org/entry/4377085 > *=============================
> - 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 RC summary
> <https://logbooks.jlab.org/entry/4377255 >. 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.
>
> - 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 BEAM Overview Scalers at 50 nA
> <https://logbooks.jlab.org/entry/4377217 >. 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!
>
> ==================* May 17th Swing Shift thru May 20th Owl Shift *
> =================
> - * All shifts are canceled! *
>
> ===========================* May 20th Day Shift *
> =============================
> - * A shift is on standby *since MCC plans to investigate our beam
> quality issues, as announced today, Monday, May 19th, in their morning meetings!
>
>
> ===========================* Game Plan *===========================
> - Updated Short Term Schedule
> <https://wiki.jlab.org/clas12-run/index.php/Run_Group_L#tab=Short_Term_Schedule >
>
> =============================* BTA *=============================
> - ABU: 342.8 → 342.8 / (68.5 × 24) = 20.85%, * as of 05/16 due to beam
> delivery issues! *
> - Day 43 of 137 scheduled: 43 / 137 = 31.4 %
> - BANU: none; no beam!
>
> ========================* Outstanding Major Tasks *
> ========================
> - 80s beam oscillations, beamline scrapping, and bleedthrough!
> - Faraday Cup vacuum remains elevated — to be addressed after run ends
>
> =============================* Run Summary *=============================
> - None; no beam!
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/clas_members/attachments/20250520/dbf1f4b2/attachment-0001.htm>