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<span style="caret-color: rgb(0, 0, 0); font-family: Calibri, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">Dear Collaborators,</span></div>
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<span style="caret-color: rgb(0, 0, 0); font-family: Calibri, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"><br>
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<div><span style="background-color: rgb(255, 255, 255); display: inline !important;"><font face="Calibri, Arial, Helvetica, sans-serif"><font color="#000000" size="3"><span style="caret-color: rgb(0, 0, 0);">Please find below a summary for the last few days
of the Fall 2019 run and of what was done (or not) </span></font><font color="#000000"><span style="caret-color: rgb(0, 0, 0);">during</span></font><font color="#000000" size="3"><span style="caret-color: rgb(0, 0, 0);"> the whole run.</span></font></font></span></div>
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<div style="margin:0px"><span style="margin:0px; font-family:Calibri,Helvetica,sans-serif; font-size:12pt; line-height:normal; color:rgb(0,0,0)">Thank you,</span><br>
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<span style="margin:0px; font-family:Calibri,Helvetica,sans-serif; font-size:12pt; line-height:normal; color:rgb(0,0,0)">Alexandre Deur</span></div>
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RC summary Dec. 18th-20th 2019</div>
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On Wednesday 18th 2019, the preparation and tests for the high rate production data taking of GlueX-II were successfully completed. In the evening (about 10pm), we resumed the last part of the DIRC commissioning: about 5h of data taking at DIRC voltage of 950V
and another 5h at 1050V (nominal is 1000V). The shift crew<span> </span><span style="margin: 0px; background-color: rgb(255, 255, 255); display: inline !important">noticed</span> that the rates were too low. After several hours of investigations, it was found
that a FCal fADC module had failed. Bypassing it allowed the DIRC commissioning to restart (a<span style="margin: 0px; background-color: rgb(255, 255, 255); display: inline !important">round Thursday 19th 5am</span>). The plan was then to run for about 10h
at 350 nA (GlueX-II current, compared to 150 nA for GlueX-I with thick radiators) with the new DAQ configuration, to see if any problem would appear. Next, investigation of the data corruption problem (with updated FADC firmware on FCal crates), a short TAC
test, a ComCal anode test and the tagger accidental test were planed. However, by about 6pm Thursday, a CHL crashed, followed by another CHL crash. The CEBAF ops group then proposed to extend the run to Friday noon instead of Friday 8am to compensate for the
lost time. We adapted our runplan and<span> </span><span style="margin: 0px; background-color: rgb(255, 255, 255); display: inline !important">counting room staffing </span>to the new schedule. The beam came back around 4am Friday but went down again at 5:30am
due to a<span> </span><span style="margin: 0px; background-color: rgb(255, 255, 255); display: inline !important">a 2nd pass separator failure <span style="margin: 0px; background-color: rgb(255, 255, 255); display: inline !important">compounded with a </span></span>RF
cavity trip in south LINAC. At that point, it was decided to conclude the Fall 2019 run. </div>
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Of the tasks planned during these few days, we could only finalized the DIRC commissioning, run about 3h at 350nA in GlueX II production mode, and test the new FADC firmware (successfully: it seems to be free of the corruption issue). The TAC run, the ComCal
anode current and the tagger accidental test could not be done. We had about 15min of 900 nA in the Hall Friday around 5:20am for this latter test, but<span> </span><span style="margin: 0px; background-color: rgb(255, 255, 255); display: inline !important">the
beam disappeared just has </span>Richard Jones was done with finalizing the parameters for the test and be ready to take the data.</div>
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despite of a rocky start and finish, the Fall 2019 was very successful for Hall D. </div>
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<span style="margin: 0px">We had two important goals: fully commission the DIRC, and testing our equipment, including an alternate DAQ software (cDAQ), at the high rate of GlueX-II. Both goals achieved successfully, including straight track runs and the use
of a small GEM/TRD device with an adapted trigger for improved tracking information for the DIRC. </span></div>
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<span style="margin: 0px">Other t</span><span style="margin: 0px; font-family: Calibri, Helvetica, sans-serif; line-height: normal">ests were done successfully: preparing/establishing good running condition for the GlueX II run of Spring 2020, enabling a FCal-BCal-ST
trigger and do a short Charge Pion Polarizability (CPP) test. Non-Invasive work in the Pair Spectrometer area was conducted to test the </span><span style="margin: 0px; font-family: Calibri, Helvetica, sans-serif; line-height: normal">EIC/Hall C aerogel and
new glass-scintillators.</span><span style="margin: 0px; font-family: Calibri, Helvetica, sans-serif; line-height: normal"> </span></div>
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<span style="margin: 0px; font-family: Calibri, Helvetica, sans-serif; line-height: normal">Other tasks could not be done: the </span><span style="margin: 0px; font-family: Calibri, Helvetica, sans-serif; line-height: normal">TAC run (later downgraded to a
shorter test), the full CPP test, a ComCal anode current study, the tagger accidental test and to gather enough data for physics analysis.</span></div>
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<span style="margin: 0px; font-family: Calibri, Helvetica, sans-serif; line-height: normal; background-color: rgb(255, 255, 255); display: inline !important">We are in good shape for a prompt start of high luminosity GlueX-II production early January.</span></div>
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