[Dsg-halla_gem] [EXTERNAL] Re: Prototype gas distribution system

[Marc Mcmullen]

Is there a reason Ch3 is 67 vs mid 80s for the other three channels?

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From: Anuruddha Rathnayake<mailto:adr4zs at virginia.edu>
Sent: Tuesday, January 26, 2021 11:13 AM
To: Marc Mcmullen<mailto:mcmullen at jlab.org>
Cc: Liyanage, Nilanga K (nl8n)<mailto:nl8n at virginia.edu>; dsg-halla_gem at jlab.org<mailto:dsg-halla_gem at jlab.org>; Jeffas, Sean (sj9ry)<mailto:sj9ry at virginia.edu>
Subject: Re: [Dsg-halla_gem] [EXTERNAL] Re: Prototype gas distribution system

Hi Marc,

I just looked and it works.
It seems like the readback is reading out a little less (~230) than what is says in thr flo meters (~250).

Best
Anu

On Tue, 26 Jan 2021, 11:08 Marc Mcmullen, <mcmullen at jlab.org<mailto:mcmullen at jlab.org>> wrote:
It doesn’t matter. Please just leave it.

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From: Anuruddha Rathnayake<mailto:adr4zs at virginia.edu>
Sent: Tuesday, January 26, 2021 11:07 AM
To: Marc Mcmullen<mailto:mcmullen at jlab.org>
Cc: Liyanage, Nilanga K (nl8n)<mailto:nl8n at virginia.edu>; dsg-halla_gem at jlab.org<mailto:dsg-halla_gem at jlab.org>; Jeffas, Sean (sj9ry)<mailto:sj9ry at virginia.edu>
Subject: Re: [Dsg-halla_gem] [EXTERNAL] Re: Prototype gas distribution system

Hi Marc,

Also, chuck pulled the network cable out when qe tried to re-orient the setup a little bit but didn't realize to which port (input/putput) the cable was plugged in.

Could you tell us it whether it's the input or the output?
Right now it's plugged into the output.

Best
Anu

On Tue, 26 Jan 2021, 10:57 Anuruddha Rathnayake, <adr4zs at virginia.edu<mailto:adr4zs at virginia.edu>> wrote:
Hi Marc,

Chuck and I started flowing N2 gas through the lines labeled as 1,2,3, and 4.
We are purging the system with each flow meter set to 250 cc/min.

I'll be here until noon if you want to test the system or I can be back aroun 2:30 pm to test the readback.

Best
Anu

On Mon, 25 Jan 2021, 13:20 Marc Mcmullen, <mcmullen at jlab.org<mailto:mcmullen at jlab.org>> wrote:
Thanks Anu,

After everything is connected and gas is flowing please send an email to the  dsg-halla_gem at jlab.org<mailto:dsg-halla_gem at jlab.org>  mailing list. Once we can verify that everything is flowing, I would like to test readback, by changing the flow meter settings in steps. I'll send you some step values when you are available to run some tests.

Regards,
Marc

From: Anuruddha Rathnayake <adr4zs at virginia.edu<mailto:adr4zs at virginia.edu>>
Sent: Monday, January 25, 2021 1:12 PM
To: Liyanage, Nilanga K (nl8n) <nl8n at virginia.edu<mailto:nl8n at virginia.edu>>
Cc: Marc Mcmullen <mcmullen at jlab.org<mailto:mcmullen at jlab.org>>; dsg-halla_gem at jlab.org<mailto:dsg-halla_gem at jlab.org> <dsg-halla_gem at jlab.org<mailto:dsg-halla_gem at jlab.org>>; Jeffas, Sean (sj9ry) <sj9ry at virginia.edu<mailto:sj9ry at virginia.edu>>
Subject: Re: [Dsg-halla_gem] [EXTERNAL] Re: Prototype gas distribution system

Hi Marc and Nilanga,
Thank you very much. I'll get it connected asap.
Best
Anu


On Mon, Jan 25, 2021 at 12:56 PM Liyanage, Nilanga K (nl8n) <nl8n at virginia.edu<mailto:nl8n at virginia.edu>> wrote:
Hi Marc

Thanks for taking care of the issues in the gas system.

Anu: I suggest that you (with help from Chuck as needed) reconnect the GEM layer to the prototype panel.

Best

Nilanga

From: Dsg-halla_gem <dsg-halla_gem-bounces at jlab.org<mailto:dsg-halla_gem-bounces at jlab.org>> on behalf of Marc Mcmullen <mcmullen at jlab.org<mailto:mcmullen at jlab.org>>
Sent: Monday, January 25, 2021 12:31 PM
To: dsg-halla_gem at jlab.org<mailto:dsg-halla_gem at jlab.org> <dsg-halla_gem at jlab.org<mailto:dsg-halla_gem at jlab.org>>
Subject: [Dsg-halla_gem] Prototype gas distribution system

Hi Chuck, Anu, and Jack

George has returned the regulator panel to the TEDF and connected the four channels not currently in use. He has replaced the faulty regulator, and all the gas lines are now polyethylene.  Would it be possible to connect the system back up as designed. This would require:

  *   The four channels supplying the UVA GEM should be disconnected from the output of the four 500 sccm flow meters and connected to the standard flow channels of the gas flow sensor chassis, on the back of the rack (chassis front), these channels are labeled "Std Flow" (1 to 4)


  *   Four 1/4"  gas lines should be connected from the manifold on the DSG designed regulator panel to connect to the input of the four 500 sccm flow meter, and the supply line from the gas bottle should be connected to the input fitting on the regulator panel.



  *   The output of the 500 sccm flow meters should be connected to the corresponding inputs on the back of the Gas Flow Sensor chassis input (back of the chassis), these are labeled "Std Flow" (1 to 4)

Once connected and flow has been reestablished, remote monitoring can be done by using this link:

Prototype GEM WEDM page<https://epicsweb.jlab.org/wedm/screen?edl=%2fcs%2fopshome%2fedm%2fdsg%2fGEM_text.edl>

Using this link only requires your jlab username and cue password, it can even be viewed from a smartphone. Please let me know when you are able reconnect the system, I will ensure the monitoring software is on. Currently, it is running.

Regards,
Marc



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