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

Wed Jan 27 11:42:28 EST 2021

Hi Marc,

The answer to your first question is yes, the first 4 flow meters are
connected to the UVA GEMs.

Best
Anu

On Wed, Jan 27, 2021 at 9:49 AM Marc Mcmullen <mcmullen at jlab.org> wrote:

> Hi Anu, Kondo, and Jack
>
> I have a couple of questions on the GEM testing in the TEDF.
>
> The gas has been flowing since early yesterday, are the gas lines
> connected to the UVA GEM? And secondly, do you have an estimate of when the
> testing will have enough data that we can conclude that DSG should complete
> the gas system in it's entirety, which would be an additional 42 gas
> channels to supply the SBS GEMs
>
> This second question can be addressed in detail during the next monthly
> GEM gas distribution meeting (2/5/21 at 3:45pm). But the scheduling
> information is necessary for DSG management to schedule the work.
>
> Regards,
> Marc
>
> GEM WEDM monitoring page
> <https://epicsweb.jlab.org/wedm/screen?edl=%2fcs%2fopshome%2fedm%2fdsg%2fGEM_text.edl>
> ------------------------------
> *From:* Anuruddha Rathnayake <adr4zs at virginia.edu>
> *Sent:* Tuesday, January 26, 2021 12:29 PM
> *To:* Marc Mcmullen <mcmullen at jlab.org>
> *Cc:* Liyanage, Nilanga K (nl8n) <nl8n at virginia.edu>;
> dsg-halla_gem at jlab.org <dsg-halla_gem at jlab.org>; Jeffas, Sean (sj9ry) <
> sj9ry at virginia.edu>
> *Subject:* Re: [Dsg-halla_gem] [EXTERNAL] Re: Prototype gas distribution
> system
>
> Hi Marc,
>
> That specific low meter is very bumpy. The ball jumps up and down a lot
> and it's difficult to set it to smaller values. But  67 is fine with us I
> think.
>
> George: Thanks for letting us know. We were actually reading out the
> values from the center of the ball so far. Maybe it's not clear in the
> picture. We had it at 250 when we were purging the system.
>
> Best
> Anu
>
> On Tue, Jan 26, 2021 at 11:49 AM Marc Mcmullen <mcmullen at jlab.org> wrote:
>
> Is there a reason Ch3 is 67 vs mid 80s for the other three channels?
>
>
>
> Sent from Mail
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__go.microsoft.com_fwlink_-3FLinkId-3D550986&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=hQJSuIbzwxGOX7LZbVne0gHeC6U5hlDu99LTH_I02ZM&m=qik83E1Kt2k7zwej8MGF81uyuE0k0xYMQABicEdJj-U&s=Px3gOPRY_Jq2PFCi8Y4Jq6aZ5uNRSTExwlgCoD_d5sQ&e=>
> for Windows 10
>
>
>
> *From: *Anuruddha Rathnayake <adr4zs at virginia.edu>
> *Sent: *Tuesday, January 26, 2021 11:13 AM
> *To: *Marc Mcmullen <mcmullen at jlab.org>
> *Cc: *Liyanage, Nilanga K (nl8n) <nl8n at virginia.edu>;
> dsg-halla_gem at jlab.org; Jeffas, Sean (sj9ry) <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> wrote:
>
> It doesn’t matter. Please just leave it.
>
>
>
> Sent from Mail
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__go.microsoft.com_fwlink_-3FLinkId-3D550986&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=hQJSuIbzwxGOX7LZbVne0gHeC6U5hlDu99LTH_I02ZM&m=KZk0W2gpGyKzyzyiAbgaQrF2HlUfb3KR-zZ0tDs9BjE&s=iSH9gpwoQuzZ6-mez4WBRpqn-VhrI72rUDFH0oif1BU&e=>
> for Windows 10
>
>
>
> *From: *Anuruddha Rathnayake <adr4zs at virginia.edu>
> *Sent: *Tuesday, January 26, 2021 11:07 AM
> *To: *Marc Mcmullen <mcmullen at jlab.org>
> *Cc: *Liyanage, Nilanga K (nl8n) <nl8n at virginia.edu>;
> dsg-halla_gem at jlab.org; Jeffas, Sean (sj9ry) <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>
> 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> wrote:
>
> Thanks Anu,
>
>
>
> After everything is connected and gas is flowing please send an email to
> the  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>
> *Sent:* Monday, January 25, 2021 1:12 PM
> *To:* Liyanage, Nilanga K (nl8n) <nl8n at virginia.edu>
> *Cc:* Marc Mcmullen <mcmullen at jlab.org>; dsg-halla_gem at jlab.org <
> dsg-halla_gem at jlab.org>; Jeffas, Sean (sj9ry) <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> 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> on behalf of Marc
> Mcmullen <mcmullen at jlab.org>
> *Sent:* Monday, January 25, 2021 12:31 PM
> *To:* dsg-halla_gem at jlab.org <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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>
>
>
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