[Dsg-rich] URGENT: RICH alarm

[Tyler Lemon]

Hello, 

>From the attached plot and table, it looks like during the time with no N2 flow, humidity increased by 0.28% RH (~ 30% overall increase from before flow loss). 

After flow had been restored for one hour, the humidity had decreased by 0.18% RH (~ 16% overall decrease from when flow was restored). 

Best regards, 
Tyler 


From: "Amrit Yegneswaran" <yeg at jlab.org> 
To: "Mirazita Marco" <Marco.Mirazita at lnf.infn.it> 
Cc: "dsg-rich" <dsg-rich at jlab.org>, "Robert Miller" <rmiller at jlab.org>, "Denny Insley" <dinsley at jlab.org> 
Sent: Tuesday, September 18, 2018 11:02:43 AM 
Subject: Re: [Dsg-rich] URGENT: RICH alarm 

denny, bob 
in future, for scheduled work please let the RICH group know before hand. 
amrit 


From: "Marco Mirazita" <Marco.Mirazita at lnf.infn.it> 
To: "Robert Miller" <rmiller at jlab.org> 
Cc: "dsg-rich" <dsg-rich at jlab.org>, "Denny Insley" <dinsley at jlab.org> 
Sent: Tuesday, September 18, 2018 10:56:28 AM 
Subject: Re: [Dsg-rich] URGENT: RICH alarm 

Hi all, 
it is back now. 
Marco 


Il 2018-09-18 16:54 Robert Miller ha scritto: 
> Hi Tyler, 
> 
> The N2 was stopped to add a valve; it will be back within the next 10 
> minutes. 
> 
> Bob 
> 
> Sent from my iPhone 
> 
> On Sep 18, 2018, at 10:51 AM, Tyler Lemon <tlemon at jlab.org> wrote: 
> 
>> Hello Bob and Denny, 
>> 
>> Is there any work being done on the forward carriage nitrogen supply 
>> line? 
>> 
>> RICH lost N2 flow and the aerogel needs to stay constantly purged by 
>> N2 to stay dry. 
>> 
>> Tyler 
>> 
>> ------------------------- 
>> 
>> FROM: "Mirazita Marco" <Marco.Mirazita at lnf.infn.it> 
>> TO: rich at jlab.org, "dsg-rich" <dsg-rich at jlab.org> 
>> SENT: Tuesday, September 18, 2018 10:39:21 AM 
>> SUBJECT: [Dsg-rich] URGENT: RICH alarm 
>> 
>> Hi all, 
>> it seems that few minutes ago the N2 flow dropped to 0. 
>> Can someone please check what is going on? 
>> Thank you 
>> Marco 
>> 
>> _______________________________________________ 
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>> Dsg-rich at jlab.org 
>> https://mailman.jlab.org/mailman/listinfo/dsg-rich [1] 
> 
>> <n2flow.png> 
> 
> 
> Links: 
> ------ 
> [1] https://mailman.jlab.org/mailman/listinfo/dsg-rich 
> 
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