<div dir="ltr"><div>Bob, <br></div><div> The bubbles through the bubbler BB314 have been observed clearly at high flow rate, but less visible at our currently 150 sccm. However, we need to adjust the oil level in BB314 very soon, with your guidance. <br></div><div>FYI, I am available most of the time at JLab for any help needed. <br></div><div><br></div><div>Mohammad. <br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jan 3, 2020 at 2:12 PM Bob Miller <<a href="mailto:rmiller@jlab.org">rmiller@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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Mohammad,</div>
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Any flow through the DMS must exit through bubbler BB314. There is currently no flow through the bubbler, so I don't see how you are getting any flow through the DMS, unless the DMS is leaking all the gas that is flowing to it.</div>
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Bob</div>
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<div id="gmail-m_-6713651140749240992divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> <a href="mailto:mhattawy@odu.edu" target="_blank">mhattawy@odu.edu</a> <<a href="mailto:mohammad.hattawy@gmail.com" target="_blank">mohammad.hattawy@gmail.com</a>><br>
<b>Sent:</b> Friday, January 3, 2020 2:06 PM<br>
<b>To:</b> Bob Miller <<a href="mailto:rmiller@jlab.org" target="_blank">rmiller@jlab.org</a>><br>
<b>Cc:</b> Sebastian Kuhn <<a href="mailto:kuhn@jlab.org" target="_blank">kuhn@jlab.org</a>>; JIWAN POUDEL <<a href="mailto:jpoud001@odu.edu" target="_blank">jpoud001@odu.edu</a>>; <a href="mailto:dsg-rtpc@jlab.org" target="_blank">dsg-rtpc@jlab.org</a> <<a href="mailto:dsg-rtpc@jlab.org" target="_blank">dsg-rtpc@jlab.org</a>>; Nathan Baltzell <<a href="mailto:nbaltzel@odu.edu" target="_blank">nbaltzel@odu.edu</a>>; Carlos Ayerbe Gayoso <<a href="mailto:gayoso@jlab.org" target="_blank">gayoso@jlab.org</a>>; Krister Bruhwel <<a href="mailto:bruhwel@jlab.org" target="_blank">bruhwel@jlab.org</a>><br>
<b>Subject:</b> Re: [Dsg-rtpc] [EXTERNAL] Gas fittings for the BONuS12 DMS</font>
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<div>Hello Bob and all, <br>
</div>
<div> FYI, the return gas from the RTPC has been flowing through the DMS since December 20th and we are reading data through the DMS system now.
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<div>Best regards,</div>
<div>Mohammad. <br>
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<br>
<div>
<div dir="ltr">On Fri, Jan 3, 2020 at 1:59 PM Bob Miller <<a href="mailto:rmiller@jlab.org" target="_blank">rmiller@jlab.org</a>> wrote:<br>
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<blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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Hi Sebastian,</div>
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1) Krister and Brian will be working on the gas panel cabling on Monday. When the cabling is complete, we can bring the gas panel to the Hall on Tuesday or Wednesday, if the Hall is still open. We should be able to test the gas panel in one shift and have
it back in the EEL at the end of the day.</div>
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2) Brian will respond.</div>
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3) As far as I know, the gas supplied to RTPC 1 and 2 has not returned to the gas panel. Therefore, there is no flow through the DMS. At what point do you want to move the DMS to the mixed gas supply line?</div>
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Regards,</div>
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Bob<br>
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<div id="gmail-m_-6713651140749240992x_gmail-m_2257697073881300921divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Sebastian Kuhn <<a href="mailto:kuhn@jlab.org" target="_blank">kuhn@jlab.org</a>><br>
<b>Sent:</b> Friday, January 3, 2020 11:58 AM<br>
<b>To:</b> Bob Miller <<a href="mailto:rmiller@jlab.org" target="_blank">rmiller@jlab.org</a>><br>
<b>Cc:</b> Mohammad Hattawy <<a href="mailto:mohammad.hattawy@gmail.com" target="_blank">mohammad.hattawy@gmail.com</a>>; JIWAN POUDEL <<a href="mailto:jpoud001@odu.edu" target="_blank">jpoud001@odu.edu</a>>;
<a href="mailto:dsg-rtpc@jlab.org" target="_blank">dsg-rtpc@jlab.org</a> <<a href="mailto:dsg-rtpc@jlab.org" target="_blank">dsg-rtpc@jlab.org</a>>; Nathan Baltzell <<a href="mailto:nbaltzel@odu.edu" target="_blank">nbaltzel@odu.edu</a>>; Carlos Ayerbe Gayoso
<<a href="mailto:gayoso@jlab.org" target="_blank">gayoso@jlab.org</a>><br>
<b>Subject:</b> Re: [Dsg-rtpc] [EXTERNAL] Gas fittings for the BONuS12 DMS</font>
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<div>Dear Bob and all,
<div><br>
</div>
<div>first of all, Happy New Year - it will be an exciting one for our experiment. </div>
<div>I wanted to ask two questions:</div>
<div><br>
</div>
<div>1) What are the present plans for taking the existing gas panel from the EEL to the Hall? I remember that there was talk about testing out connections in the Hall sometime next week before RGB comes back online. I don’t know exactly where the accelerator
folks are with beam restoration, but it is my understanding that this could already happen towards the middle of the week. In any case, as you know, we depend on the gas panel for tests in the EEL and would like to minimize the time without it, so it would
be helpful to have a plan on what will happen when.</div>
<div><br>
</div>
<div>2) Is there a possibility to add one more item to the gas panel? (rather belated, I know - my apologies) I realized that we really would like to be able to measure the differential pressure between the 4He gas buffer volume (orange in the gas panel design
drawings) and the RTPC (green). This would</div>
<div>a) close the loop so we have both absolute and relative pressure for all relevant parts of the system</div>
<div>b) allow us to monitor (and alarm on) any pressure differential between the RTPC and the buffer volume that exceeds the (rather limited) safety margin for the thin ground foil between the two.</div>
<div><br>
</div>
<div>I have made a crude addition to the drawing to show where this differential pressure meter would go (see below, in heavy red lines). In addition to two more “T’s” that would have to be integrated into the existing lines, this would also require of course
that we have a spare for such an instrument, and it would have to be added to the LabView and EPICS panels. Is this feasible?</div>
<div><br>
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<div>Thank you, and best greetings - Sebastian</div>
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<div><img id="gmail-m_-6713651140749240992x_gmail-m_2257697073881300921x_BC74904D-2976-46D8-BFD8-48873614A1D3" style="display: inline;" src="cid:16f6cd55787c58e0061"></div>
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-- <br>
<div dir="ltr">Best regards,<br>
Mohammad Hattawy.<br>
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</blockquote></div><br clear="all"><br>-- <br><div dir="ltr" class="gmail_signature">Best regards,<br>Mohammad Hattawy.<br></div>