[Dsg-rich] Fwd: rich hv

[Amrit Yegneswaran]

hello marco, 
i take issue with your opening paragraph. 
instead of writing: 

Hi Tyler, 
it would be important we are notified before such actions take 
place, in order we can plan mitigation measures and controls 
in advance. 

i wish you had written: 
Hi bob,volker, stepan, valery 
it would be important we are notified before such actions take 
place, in order we can plan mitigation measures and controls 
in advance. 
amrit 






From: "Marco Contalbrigo" <mcontalb at fe.infn.it> 
To: "Tyler Lemon" <tlemon at jlab.org> 
Cc: "dsg-rich" <dsg-rich at jlab.org> 
Sent: Friday, June 29, 2018 9:50:59 AM 
Subject: Re: [Dsg-rich] Fwd: rich hv 

Hi Tyler, 
it would be important we are notified before such actions take 
place, in order we can plan mitigation measures and controls 
in advance. 

If I am not mistaken, A-37 was a broken cable. Better leave 
it unplugged. 

Regarding the checks, we dislike to tun the system 
without knowing what exactly has been done and restore. 

If really only the HV were disconnected should not be 
a big deal, but sounds strange LV and fibers did not 
interfere with LTCC removal.... 

For example, inside the RICH there are LED lights 
and camera for the aerogel check. Their LV channels 
do not appear in the slow control to avoid any 
unwanted turn on (to preserve MAPMTs). In case 
of cable swap, we may turn on the wrong element and 
stress or even damage the PMTs. 

Our preference would be to make the checks during the 
coll. meeting (10-13 July) when we will be there in 
person. 

Ciao, Marco. 

On Fri, 29 Jun 2018, Tyler Lemon wrote: 

> Hello Marco, Valery, 
> 
> Please see Morgan's email below. 
> 
> RICH HV was disconnected by Hall B Engineering to be able to remove LTCC sectors from the forward 
> carriage. Yesterday, HV was reconnected to RICH. 
> 
> What checks would need to be run to ensure that HV is connected correctly to RICH? 
> 
> Best regards, 
> Tyler 
> 
> ________________________________________________________________________________________________________ 
> From: "Morgan Cook" <mcookiv at jlab.org> 
> To: "Tyler Lemon" <tlemon at jlab.org> 
> Cc: dsg-internal at jlab.org 
> Sent: Thursday, June 28, 2018 9:20:44 AM 
> Subject: rich hv 
> 
> Hi Tyler, 
> 
> The rich detector hv is plugged back in. I plugged the 'spare' hv cable in to A-37 since the A-37 cable 
> had been tied off to the side for whatever reason. You may want to run any checks on it sooner rather 
> than later since we'll be moving the lift early next week. 
> 
> Regards, 
> Morgan 
> 
> 
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