[Dsg-hallbgas] LTCC sectors 3 and 5

[Brian Eng]

Mauri,

That "significant drop" you were referring to yesterday is just due to the deadband of the archiver (0.1 slm) so all of the spots where it doesn't have a spike should be considered equivalent to zero.

If you zoom out a bit further and add the sector pressure as well you can see there is a significant difference from when the detector was attached versus when it was removed.

Namely the amount of time the flow is on (~30 min vs ~3 sec) and how high the pressure gets when the flow is applied.

George has mentioned that the 3-way valves used to turn off the gas are quite old and difficult to put in the completely closed position.

----- Original Message -----
> From: "Maurizio Ungaro" <ungaro at jlab.org>
> To: dsg-hallbgas at jlab.org, "David Anderson" <dla at jlab.org>, "Stepan Stepanyan" <stepanya at jlab.org>
> Sent: Tuesday, August 29, 2017 9:28:26 AM
> Subject: Re: [Dsg-hallbgas] LTCC sectors 3 and 5

> Hi Brian, Marc, David,
> 
> If I understood correctly (please correct me if I'm wrong) Dave bypassed S4 box
> (i.e. jumped the 2 ends together) on Friday the 25.
> 
> On the flow chart for S4 I see a signigicant drop yesterday right after 8am, but
> not much on Friday, see attached plot, not sure how to interpret it.
> 
> Could you update on the leaks calculations for S4, and give updates in general,
> both on leak checks and leaks measured, when available?
> 
> Thanks so much for this important work,
> 
> Mauri
> 
> 
> 
> 
> 
> 
> On Aug 29, 2017, at 8:51 AM, Marc McMullen < mcmullen at jlab.org > wrote:
> 
> 
> 
> 
> 
> 
> -------- Forwarded Message --------
> Subject: 	Re: LTCC sectors 3 and 5
> Date: 	Tue, 29 Aug 2017 08:43:32 -0400
> From: 	Marc McMullen <mcmullen at jlab.org>
> To: 	Morgan Cook <mcookiv at jlab.org>
> CC: 	Dsg-hallbgas <dsg-hallbgas-bounces at jlab.org> , David Anderson
> <dla at jlab.org>
> 
> Hi Morgan,
> 
> I have changed the setpoint on the MFCs to 0 for S3 and S5. Before David
> starts his work, he should change the valve position on the 3 way valve
> for those two sectors to the close position which is straight down
> (90deg from current).
> 
> 
> Thanks,
> 
> Marc
> 
> 
> On 8/29/2017 7:14 AM, Morgan Cook wrote:
>> Mark,
>>
>> Please shut off the gas to LTCC sectors 3 and 5.  David is going to leak check
>> them.  In addition, please let us know when the gas is off.
>>
>> Thanks,
>> Morgan
> 
> --
> Marc McMullen
> Detector Support Group
> 757-269-7738
> _______________________________________________
> Dsg-hallbgas mailing list
> Dsg-hallbgas at jlab.org
> https://mailman.jlab.org/mailman/listinfo/dsg-hallbgas
> 
> 
> _______________________________________________
> Dsg-hallbgas mailing list
> Dsg-hallbgas at jlab.org
> https://mailman.jlab.org/mailman/listinfo/dsg-hallbgas
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Screen Shot 2017-08-29 at 10.16.23 AM.png
Type: image/png
Size: 17548 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/dsg-hallb_gas/attachments/20170829/d2a7bd54/attachment-0002.png>