[Halld-cal] Minutes from yesterday's meeting

[Fernando Barbosa]

Hello Elton, all,



Some notes regarding the paragraph below:

a)       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.

b)      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.

c)       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.

d)      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.



Best regards,

Fernando







[cid:image001.png at 01D59BC4.0B03A060]



-----Original Message-----
From: Halld-cal <halld-cal-bounces at jlab.org> On Behalf Of Elton Smith
Sent: Friday, November 15, 2019 1:25 PM
To: halld-cal at jlab.org
Subject: [Halld-cal] Minutes from yesterday's meeting



Dear collaborators,



I have posted the minutes from yesterday's meeting on the wiki at https://halldweb.jlab.org/wiki/index.php/Nov_14,_2019_Calorimeter#Minutes.



Cheers, Elton.



--

Elton Smith

Jefferson Lab MS 12H3

12000 Jefferson Ave STE 4

Newport News, VA 23606

(757)269-7625

(757)269-6331 fax



_______________________________________________

Halld-cal mailing list

Halld-cal at jlab.org<mailto:Halld-cal at jlab.org>

https://mailman.jlab.org/mailman/listinfo/halld-cal
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/halld-cal/attachments/20191115/6a8bfd83/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 20174 bytes
Desc: image001.png
URL: <https://mailman.jlab.org/pipermail/halld-cal/attachments/20191115/6a8bfd83/attachment-0001.png>