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<p class="MsoPlainText">Hello Elton, all,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Some notes regarding the paragraph below:<o:p></o:p></p>
<p class="MsoPlainText" style="margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style="mso-list:Ignore">a)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>The overheating is not an issue unless the hall temperature increases significantly above the specs. For a full description, refer to GlueX-doc-2752. My recommendation has always been to operate the fans fixed at 4,000 RPM or in the
3,000 RPM to 5,000 RPM range under PID control.<o:p></o:p></p>
<p class="MsoPlainText" style="margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style="mso-list:Ignore">b)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>During the Summer, we experienced some unexplained failures. Nick recently informed me that there were two instances when the temperature in the hall was excessive duw to HVAC failures or door open for long periods of time. Nick has
suggested some additional interlock controls. It would be instructive if someone could check the environmental logs and others since the end of the Spring run.<o:p></o:p></p>
<p class="MsoPlainText" style="margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style="mso-list:Ignore">c)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>The last sentence is not correct. Spreading the modules apart will not provide better cooling as the thermal radiative losses are insignificant compared to the convective cooling efficiency.<o:p></o:p></p>
<p class="MsoPlainText" style="margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style="mso-list:Ignore">d)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>There is also the possibility of radiation damage on the D2 platform due to changing experimental conditions (prototype tests of the COMCAL and others). This was also brought up by CAEN during maintenance of failed HV controllers. I
have Alexandre D. to look into this in detail from logs of radiation detectors he manages.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Best regards,<o:p></o:p></p>
<p class="MsoPlainText">Fernando<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><img width="1144" height="164" style="width:11.9166in;height:1.7083in" id="Picture_x0020_1" src="cid:image001.png@01D59BC4.0B03A060"><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">-----Original Message-----<br>
From: Halld-cal <halld-cal-bounces@jlab.org> On Behalf Of Elton Smith<br>
Sent: Friday, November 15, 2019 1:25 PM<br>
To: halld-cal@jlab.org<br>
Subject: [Halld-cal] Minutes from yesterday's meeting</p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Dear collaborators,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I have posted the minutes from yesterday's meeting on the wiki at
<a href="https://halldweb.jlab.org/wiki/index.php/Nov_14,_2019_Calorimeter#Minutes">
<span style="color:windowtext;text-decoration:none">https://halldweb.jlab.org/wiki/index.php/Nov_14,_2019_Calorimeter#Minutes</span></a>.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Cheers, Elton.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">--<o:p></o:p></p>
<p class="MsoPlainText">Elton Smith<o:p></o:p></p>
<p class="MsoPlainText">Jefferson Lab MS 12H3<o:p></o:p></p>
<p class="MsoPlainText">12000 Jefferson Ave STE 4<o:p></o:p></p>
<p class="MsoPlainText">Newport News, VA 23606<o:p></o:p></p>
<p class="MsoPlainText">(757)269-7625<o:p></o:p></p>
<p class="MsoPlainText">(757)269-6331 fax<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">_______________________________________________<o:p></o:p></p>
<p class="MsoPlainText">Halld-cal mailing list<o:p></o:p></p>
<p class="MsoPlainText"><a href="mailto:Halld-cal@jlab.org"><span style="color:windowtext;text-decoration:none">Halld-cal@jlab.org</span></a><o:p></o:p></p>
<p class="MsoPlainText"><a href="https://mailman.jlab.org/mailman/listinfo/halld-cal"><span style="color:windowtext;text-decoration:none">https://mailman.jlab.org/mailman/listinfo/halld-cal</span></a><o:p></o:p></p>
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