<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Great, thanks so much for the update, Daria!<br><br><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On 5 Dec 2019, at 21:34, Daria Sokhan <daria@jlab.org> wrote:<br><br></blockquote></div><blockquote type="cite"><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">A summary of the meeting / post-meeting discussion for those who could not call in:</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* Helicity T-settle gate was only 500 us (compared with T-settle at the injector of 90 us) -- Stepan reduced it to 150 us, but warns that this might not fix the issue that the last Møller measurement took a couple of hours to converge to the large uncertainty of 2.2%. We will do another Møller run when it's practical.</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* Farm is overloaded, mostly with Hall D at the moment: our skim jobs for TOF/HTCC calibration run 11019 are pending, so Aram is in parallel also running them interactively. It will be a few more hours before they're ready. </div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* Valery has finished debugging the trigger firmware (the missing u1 paddles from ECAL have been added) and the trigger files are ready for validation and now also include DC roads. </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 discussion of the very high electron rates which we observed last night running with 50 and 40nA, and whether the cause is purely due to switching from inbending to outbending or also due to something else. We will study the rates after the trigger validation.</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* Youri needs to do a series of short runs on the MVT to determine optimal discriminator thresholds. </div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* Sergey has found that one of the MVT boards is taking a very long time to process signals and that this is responsible for the low live-time (75%) which we saw at high current yesterday. He's emailed Heracli. </div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* Rafo has updated FC beam blocker attenuation coefficients -- his calibration study is in the log book: <a href="https://logbooks.jlab.org/files/2019/12/3747119/Dec_05_2019.pdf" style="font-family:Arial,Helvetica,sans-serif">https://logbooks.jlab.org/files/2019/12/3747119/Dec_05_2019.pdf</a> </div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* MCC plan to finish RF stress test by end of day shift today. We will do trigger validation as soon as TOF and HTCC calibration is ready, then MVT runs for discriminator thresholds, then go to production running. In as much as beam allows.</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Thanks,</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 class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></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 Thu, 5 Dec 2019 at 12:04, 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 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">We'll have our usual 2pm RC meeting in the conference room on the top floor of the counting house.</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" 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=4Kuc6A6cLWHgLmFlI4JHg4iptghIBnDsaLe3F8D8TeI&s=k0ulf5CP8Jxdjy6qASo3LitCdjKxsvwFmNZN-fTjsIQ&e=" style="font-family:Arial,Helvetica,sans-serif" target="_blank">https://bluejeans.com/230805731</a></div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Summary since yesterday:</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* Last night we took data @ 30 and 40nA, which has been cooked overnight for FTOF, CTOF and HTCC calibrations. </div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* During the evening, night and early morning Nick Z. took FT Hodoscope calibration runs for gain matching and Rafo took runs for the Faraday Cup beam blocker attenuation calibration. </div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">* MCC is doing RF stress tests during the day shift today, which will make our beam pretty unusable -- we're in Controlled Access, work is ongoing to debug BOM counter and the Møller set-up. </div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">See you all soon,</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 class="gmail_default" style="font-family:verdana,sans-serif"> </div></div></div>
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