<div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif">Dear all,</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Update, as usual!</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">During hall access today:<br>* Krister traced the problem on the tripping Moller magnet to a potentially faulty temperature sensor which causes the magnet to ramp down when it reaches a much lower temperature than is of concern. He has replaced it with a new one and it will need to cure for about 24h before he can bolt things up again, for which he'll need a ~30min access at the next opportunity from tomorrow onwards. Moller is unusable until then. He would also like to test it by switching it on and taking regular measurements with a heat camera for a while (~3h, whenever there's a long opportunistic access), but says that this is not crucial -- another way to test it is to do a Moller run when we finally need one. <a href="https://logbooks.jlab.org/entry/3750731">https://logbooks.jlab.org/entry/3750731</a><br>* Cole debugged noisy ECAL channel: <a href="https://logbooks.jlab.org/entry/3750593">https://logbooks.jlab.org/entry/3750593</a><br>* Bob removed the two neutron counters closest to BAND on Florian's request and installed a gamma monitor close to SVT (between target and solenoid) to monitor radiation levels in SVT vicinity.<br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* Loss of communication with the BAND laser -- Florian tried to debug it but needs more time (at the next opportunistic access: we're expecting beam imminently).</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* Nick M has updated gain calibration for sector 4 in HTCC, which looked slightly skewed yesterday. This will apply to run 11134 onwards.</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* Run 11123 with the test of trigger v13 (PCAL+ECAL E-sum > 300 MeV) had been analysed by Rafo and Valery, they find that there's a reduction in electron trigger rate of 10% and a reduction of 4% in the "muon" trigger efficiency. The decision is to stick with our current production trigger, so this special run needs no further analysis.</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* Cole is producing timelines for the calorimeter to check sampling fraction, which appears to decrease at the start of operations with beam. This was observed before in the Spring run and last year.</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* There was a discussion about which runs to cook now that the first ten runs have been cooked for all (or almost all) good runs. We decided to put off cooking the whole of 11102 for calibrations until a discussion with </div><div class="gmail_default" style="font-family:verdana,sans-serif">Silvia and instead to cook the low luminosity runs 11117 and 11120 for comparison between low and high luminosity data, in particular of the timing.</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* There was a long discussion on whether to keep a separate Google spreadsheet of the data-runs or rely on RCDB -- this has been deferred until RG-B meeting on Friday. The only consensus was that we need instructions on how to extract data from the database and that shift leaders need to enter accurate and informative information in the comment field when starting / ending runs. I have put a loud and visible note about this on the Short Term Schedule wiki: <a href="https://wiki.jlab.org/clas12-run/index.php/Run_Group_B#Short_Term_Schedule" style="font-family:Arial,Helvetica,sans-serif">https://wiki.jlab.org/clas12-run/index.php/Run_Group_B#Short_Term_Schedule</a></div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* Spin dance is likely to happen on Thursday or Friday now -- only halls A + C will participate. It's expected to take ~8 hours and we need a clear run plan for measurements which do not require polarisation information. We plan to do zero field, empty target and luminosity measurements and will define tomorrow the length of each. Please let us know of any requests / suggestions.</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">And hot off the press: MCC have fixed the leak and are getting ready for beam! We've finished up in the hall, energised solenoid and torus and are getting ready to tune the beam!</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Here's hoping for clean beam, </div><div class="gmail_default" style="font-family:verdana,sans-serif">Daria</div><div class="gmail_default" style="font-family:verdana,sans-serif"> <br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, 10 Dec 2019 at 11:52, Daria Sokhan <<a href="mailto:daria@jlab.org" target="_blank">daria@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div style="font-family:verdana,sans-serif">Dear all, </div><div style="font-family:verdana,sans-serif"><br></div><div style="font-family:verdana,sans-serif">Let's have an RC meeting @ 2pm again today, upstairs in the counting house. </div><div style="font-family:verdana,sans-serif"><br></div><div style="font-family:verdana,sans-serif">Bluejeans: <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__bluejeans.com_230805731&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=p0fOsYOqPes7kSrF0-ldLy8UQdwZWwpYV125WHZsrFE&m=ht3_UVMd6GPD6IsY07jG7trMFu5AOnPku-bc3CC6cTM&s=_d6Ra0QZtqzXI4ESkrr3pKXt1jccszY_Z9T26Y3v4EA&e=" target="_blank">https://bluejeans.com/230805731</a></div><div style="font-family:verdana,sans-serif"><br></div><div style="font-family:verdana,sans-serif">The accelerator is still down, there are some adjustments and checks ongoing in the hall. This is a good time to discuss any more issues that have been observed in the data. If experts could take a look at monitoring histograms which Yordanka has produced for the recent runs and report on anything "interesting", that would be great: <a href="https://clasweb.jlab.org/clas12mon/rg-b/pass0/v17_fall2019/offline/" target="_blank">https://clasweb.jlab.org/clas12mon/rg-b/pass0/v17_fall2019/offline/</a></div><div style="font-family:verdana,sans-serif"><br></div><div style="font-family:verdana,sans-serif">Speak to you soon,</div><div style="font-family:verdana,sans-serif">Daria</div><div style="font-family:verdana,sans-serif"><br></div><div style="font-family:verdana,sans-serif">PS: I'll make everyone speaking sit around the table so people on the phone can hear them!</div><div style="font-family:verdana,sans-serif"><br></div><div style="font-family:verdana,sans-serif"><br></div></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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