<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">Dear Hall-B Members and Collaborators,</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">tomorrow, Monday, is a public holiday and the Hall B Meeting is cancelled for this week. Please find below a summary.</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;"> </span></p>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">Best,</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">Patrick</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;"><b><br>
</b></span></p>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;"><b>Activities and Announcements</b></span></p>
<ul style="margin-top: 0cm; margin-right: 0cm; list-style-type: disc;">
<li style="font-family: "Arial", sans-serif; font-size: 12pt; line-height: 107%; margin-top: 0cm; margin-bottom: 8pt; color: black;">
<span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">Last Friday, 12 January 2024 Jesmin Nazeer gave a presentation on her PhD work titled "Construction and commissioning of Gas Electron Multiplier (GEM) detectors in advance assembly
design for low-energy applications at high rates and analysis of GEM data from the MUSE experiment at PSI".<br>
</span></li><li style="font-family: "Calibri", sans-serif; font-size: 11pt; line-height: 107%; margin-top: 0cm; margin-bottom: 8pt; color: rgb(0, 0, 0);">
<span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">A four-day Geant4 Tutorial Course at Jefferson Lab, scheduled for 25-29 March 2024 could be interesting for Hall B members. Details will be announced through the Cuga mailing list
and on the Geant4 Collaboration web site: <a href="https://geant4.org/collaboration/events" id="OWA5c5d658b-46ef-c962-907d-21263a417f32" class="OWAAutoLink">
https://geant4.org/collaboration/events</a>. </span></li></ul>
<p style="margin: 0cm 0cm 8pt;"><span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;"><b>Data Calibration and Processing</b> </span></p>
<ul style="margin-top: 0cm; margin-right: 0cm; list-style-type: disc;">
<li style="font-family: "Calibri", sans-serif; font-size: 11pt; line-height: 107%; margin-top: 0cm; margin-bottom: 8pt; color: rgb(0, 0, 0);">
<span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">Calibrations of the RG-A and RG-C data sets continue; RG-C is preparing for a ready-for-cooking review for the Summer 2023 portion of the run; alignments for the RG-D data set and
the new RG-K alignment runs continues; RG-D is preparing for a ready-for-calibration review. </span></li></ul>
<p style="margin: 0cm 0cm 8pt;"><span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;"><b>Current RG-K Run</b> </span></p>
<ul style="margin-top: 0cm; margin-right: 0cm; list-style-type: disc;">
<li style="font-family: "Arial", sans-serif; font-size: 12pt; line-height: 107%; margin-top: 0cm; margin-bottom: 0cm; color: black;">
<div><span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">RG-K restarted on Thursday, 11 January 2024 with a Moeller run, harp scans, empty warm and cold target alignment runs and commenced with pre-production runs on Saturday morning,
followed by smooth RG-K production data taking with a beam current of 65 nA. </span></div>
<div style="line-height: 107%; margin-top: 0cm; margin-bottom: 0cm; font-family: "Arial", sans-serif; font-size: 12pt; color: black;">
<br>
</div>
</li><li style="font-family: "Arial", sans-serif; font-size: 12pt; line-height: 107%; margin-top: 0cm; margin-bottom: 0cm; color: black;">
<span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">DC voltages and thresholds have been studied and optimized to provide best momentum resolutions.<br>
</span>
<div style="line-height: 107%; margin-top: 0cm; margin-bottom: 0cm; font-family: "Arial", sans-serif; font-size: 12pt; color: black;">
<br>
</div>
</li><li style="font-family: "Arial", sans-serif; font-size: 12pt; line-height: 107%; margin-top: 0cm; margin-bottom: 8pt; color: black;">
<span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">Until Wednesday, Hall B is the only hall receiving beam from CEBAF. </span></li></ul>
<p style="margin: 0cm 0cm 8pt;"><span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;"><b>Design and Engineering: </b></span></p>
<ul style="margin-top: 0cm; margin-right: 0cm; list-style-type: disc;">
<li style="font-family: "Arial", sans-serif; font-size: 12pt; line-height: 107%; margin-top: 0cm; margin-bottom: 0cm; color: black;">
<span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">For RG-E: An interference between the cryo-target and the dual target was found, models were reviewed and parts to remove interference were updated; the CAD model for the 2 cm target
cell was updated.</span>
<div style="line-height: 107%; margin-top: 0cm; margin-bottom: 0cm; font-family: "Arial", sans-serif; font-size: 12pt; color: black;">
<br>
</div>
</li><li style="font-family: "Arial", sans-serif; font-size: 12pt; line-height: 107%; margin-top: 0cm; margin-bottom: 0cm; color: black;">
<span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">For ALERT: The Drift Chamber gas control system tank and exhaust fan were tested; work with the DSG to update the gas system; evaluation of target straw and tooling.</span>
<div style="line-height: 107%; margin-top: 0cm; margin-bottom: 0cm; font-family: "Arial", sans-serif; font-size: 12pt; color: black;">
<br>
</div>
</li><li style="font-family: "Arial", sans-serif; font-size: 12pt; line-height: 107%; margin-top: 0cm; margin-bottom: 8pt; color: black;">
<span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">For uRWell prototype operation: work on hodoscope design to incorporate multianode PMTs. </span></li></ul>
<p style="margin: 0cm 0cm 8pt;"><span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;"><b>Hall B Work and Status </b></span></p>
<ul style="margin-top: 0cm; margin-right: 0cm; list-style-type: disc;">
<li style="font-family: "Calibri", sans-serif; font-size: 11pt; line-height: 107%; margin-top: 0cm; margin-bottom: 0cm; color: rgb(0, 0, 0);">
<span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">The Region-1 Sector-4 Drift Chamber was repaired, tested, and installed. </span></li><li style="font-family: "Calibri", sans-serif; font-size: 11pt; line-height: 107%; margin-top: 0cm; margin-bottom: 0cm; color: rgb(0, 0, 0);">
<span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">The RG-D foil assembly was removed from the target. </span></li><li style="font-family: "Calibri", sans-serif; font-size: 11pt; line-height: 107%; margin-top: 0cm; margin-bottom: 0cm; color: rgb(0, 0, 0);">
<span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">Beam line shielding inside FT mount was inspected; this information will be used to update the CAD model. </span></li><li style="font-family: "Calibri", sans-serif; font-size: 11pt; line-height: 107%; margin-top: 0cm; margin-bottom: 0cm; color: rgb(0, 0, 0);">
<span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">Survey and successful alignment of Forward Tagger, Moller cone, Drift Chamber, and target is completed. </span></li><li style="font-family: "Calibri", sans-serif; font-size: 11pt; line-height: 107%; margin-top: 0cm; margin-bottom: 0cm; color: rgb(0, 0, 0);">
<span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">The new ion pump at the Faraday cup was started and works fine. </span></li><li style="font-family: "Calibri", sans-serif; font-size: 11pt; line-height: 107%; margin-top: 0cm; margin-bottom: 8pt; color: rgb(0, 0, 0);">
<span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">By Wednesday, all CLAS12 subsystems were moved back into the run position. </span></li></ul>
<p style="margin: 0cm 0cm 8pt;"><span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;"><b>Safety </b></span></p>
<ul style="margin-top: 0cm; margin-right: 0cm; list-style-type: disc;">
<li style="font-family: "Calibri", sans-serif; font-size: 11pt; line-height: 107%; margin-top: 0cm; margin-bottom: 0cm; color: rgb(0, 0, 0);">
<span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">“Skill of Craft” Permit-To-Work on issue in ePAS and three different “Electrical Work” Permits-To-Work ready for issue in ePAS; with these most relevant work in the hall is covered.
</span></li><li style="font-family: "Calibri", sans-serif; font-size: 11pt; line-height: 107%; margin-top: 0cm; margin-bottom: 8pt; color: rgb(0, 0, 0);">
<span style="font-family: "Arial", sans-serif; font-size: 12pt; color: black;">No scheduled high hazard work for the upcoming week. </span></li></ul>
<div style="line-height: 107%; margin-top: 0cm; margin-bottom: 8pt;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><br>
</span><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><br>
</span></div>
</body>
</html>