[Sbs] [New Logentry] Hall-A RC Update, April 17, 2025

[adr at jlab.org]

Logentry Text:
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<p>Dear Collaborators, <br><br>The current status of the run at the start of the day shift is, after coming back from accelerator maintenance day yesterday, we have more or less centered the beam on the "cross" target but yet to commence production running on LH2. </p><ul><li>Analyzer was installed yesterday. Other detector maintainance work were aso done on GEMs, CDet, ECal, and DAQ. We went to beam permit around 6 pm and recieved first tune beam between 8-9 pm.</li><li>Beam recovery (first) was completed around mid-night: https://logbooks.jlab.org/entry/4358634</li><li>Right around we got done with the beam recovery, accelerator started having issues: https://logbooks.jlab.org/entry/4358615   https://logbooks.jlab.org/entry/4358644</li><li>Around 2:10 am MCC called and had informed that the bea positions could be slightly off from pervious values. So shift crew started beam centering process again. During this time MCC started have issues again. </li><li>At 4:26 a
 m MCC ha
 d called back told that they will have to harp scans again. So shift crew followed along and stated the beam recovery procedure from the beginning. However, shift crew could not finish the beam recovery process as MCC encountered with even more problems. https://logbooks.jlab.org/entry/4358838</li><li>Basically MCC is still having issues coming back from the maintenance day yesterday and delivering stable beam to all the halls.</li></ul><p>Currently we are waiting for beam and will start another beam restoration and then move to the LH2 target and continue production running. Run plan for the next few hours:</p><ul><li>Restore beam. Move to LH2. Get 1uA CW beam. Ceckout GEMs with the help of GEM experts.</li><li>Move beam current in 1 uA steps while monitoring GEM rates / trigger status / DAQ  live time.</li><li>Settle on a beam current that allows stalble and efficient (high elastic rate) runnig and keep taking LH2 data fo the foreseeable future. Experts help will be o
 btained 
 for this decision. </li></ul><p>We will have RC meeting today at 1:30 pm in the meeting roon on the 2nd floor of the Counting Hourse and via Zoom: https://jlab-org.zoomgov.com/j/1616220064<br>Meeting ID: 161 622 0064<br> Passcode: 314159<br><br>Wiki page: https://sbs.jlab.org/wiki/index.php/RC_meeting_and_Run_Plan,_Thursday,_April_17th<br><br>Best regards,<br>Anuruddha Rathnayake<br>Hall-A RC.</p>

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