[dsg-hallb_htcc] Fwd: HTCC

[Brian Eng]

Thanks for the update Youri.

DSG will make sure that monitoring is working as expected once the HTCC has been moved again.

Begin forwarded message:

From: Youri Sharabian <youris at jlab.org<mailto:youris at jlab.org>>
Subject: HTCC
Date: August 31, 2022 at 9:44:33 AM EDT
To: Bob Miller <rmiller at jlab.org<mailto:rmiller at jlab.org>>, Denny Insley <dinsley at jlab.org<mailto:dinsley at jlab.org>>
Cc: Brian Eng <beng at jlab.org<mailto:beng at jlab.org>>

Dear Bob and Denny,

   The HTCC will be installed back in working position today (perhaps tomorrow, not sure). But in any case it will be done as you plan. I would like to ask you to keep HTCC disconnected from CO2 gas supply line for not more than 1 hour or so to keep humidity in the volume not very high and then restore gas flow and required low humidity (about 50 ppm) in the HTCC. Monitoring of all parameters also have to be restored and checked by Brian Eng from DSG.
   Once HTCC is back in place, aligned and fully controlled we will  connect all signal and HV cables back. Than we will start checking gains  of all 48 PMTs to equalize them and establish updated HV values. We will be using our external fast LED light source and run tests on Hall B DAQ. Cables and etc.can be installed in 4-5 hours. Equalization of PMT gains requires 2-3 hours by our group. Final calibration of the detector will be done once electron beam is back on the target.
   I'll be monitoring parameters of the HTCC remotely as usual. Please let me know (in advance if possible) when we possibly can start installing the cables.
Thank you very much.
Best regards,
                       Youri

P.S. I been in the Hall today in the morning: alignment group started with R1 DC.

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