<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Hi Narbe,</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
There was no attachment or information on your email.</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Marc</div>
<div id="appendonsend"></div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Narbe Kalantarians<br>
<b>Sent:</b> Thursday, February 14, 2019 11:06 AM<br>
<b>To:</b> Marc Mcmullen<br>
<b>Cc:</b> dsg-rtpc@jlab.org<br>
<b>Subject:</b> Fwd: RTPC Gas Controls Meeting Minutes</font>
<div> </div>
</div>
<div class="" style="word-wrap:break-word">Hi Marc,
<div class=""><br class="">
</div>
<div class="">Please see below for input for alarms/interlocks re: drift gas system. The ODU group will give (further) input on alarm need for the drift monitoring system.</div>
<div class=""><br class="">
</div>
<div class="">Also; if Nathan Baltzell isn’t no this mailing list, can you add him?</div>
<div class=""><br class="">
</div>
<div class="">Thank you.</div>
<div class=""> <br class="">
<div class="">
<div class="" style="color:rgb(0,0,0); letter-spacing:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; word-wrap:break-word">
<div class="" style="color:rgb(0,0,0); letter-spacing:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px; word-wrap:break-word">
<div class="">
<div class=""><b class="">Narbe Kalantarians, Ph. D.</b></div>
<div class="">
<div class="">Assistant Professor of Physics</div>
<div class="">Virginia Union University, Dept. of Natural Sciences </div>
<div class="">+1-804-257-5617 (VUU)</div>
<div class="">+1-757-269-5566 (JLab)</div>
</div>
</div>
<div class=""><br class="">
</div>
</div>
<br class="x_Apple-interchange-newline">
</div>
<br class="x_Apple-interchange-newline">
<br class="x_Apple-interchange-newline">
</div>
<div><br class="">
<blockquote type="cite" class="">
<div class="">Begin forwarded message:</div>
<br class="x_Apple-interchange-newline">
<div class="" style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px">
<span class="" style="color:rgba(0,0,0,1.0)"><b class="">From: </b></span><span class="" style="">"Kuhn, Sebastian E." <<a href="mailto:skuhn@odu.edu" class="">skuhn@odu.edu</a>><br class="">
</span></div>
<div class="" style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px">
<span class="" style="color:rgba(0,0,0,1.0)"><b class="">Subject: </b></span><span class="" style=""><b class="">Re: RTPC Gas Controls Meeting Minutes</b><br class="">
</span></div>
<div class="" style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px">
<span class="" style="color:rgba(0,0,0,1.0)"><b class="">Date: </b></span><span class="" style="">February 13, 2019 at 2:00:41 PM EST<br class="">
</span></div>
<div class="" style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px">
<span class="" style="color:rgba(0,0,0,1.0)"><b class="">To: </b></span><span class="" style="">Narbe Kalantarians <<a href="mailto:narbe@jlab.org" class="">narbe@jlab.org</a>><br class="">
</span></div>
<div class="" style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px">
<span class="" style="color:rgba(0,0,0,1.0)"><b class="">Cc: </b></span><span class="" style="">"<a href="mailto:christy@jlab.org" class="">christy@jlab.org</a>" <<a href="mailto:christy@jlab.org" class="">christy@jlab.org</a>>, "Hattawy, Mohammad" <<a href="mailto:mhattawy@odu.edu" class="">mhattawy@odu.edu</a>>,
Carlos Ayerbe Gayoso <<a href="mailto:gayoso@jlab.org" class="">gayoso@jlab.org</a>>, "Bueltmann, Stephen L." <<a href="mailto:SBueltma@odu.edu" class="">SBueltma@odu.edu</a>><br class="">
</span></div>
<br class="">
<div class="">
<div class="">Here are my 5 cents on these questions:<br class="">
<br class="">
1) Obviously we need to log all of the monitored quantities (temperatures, pressures and gas flows) in the CLAS12 data stream.<br class="">
<br class="">
2) There should be a feedback loop that regulates the gas flow to keep the pressure inside the RTPC at a fixed value (set by the operator from an EPICS screen)<br class="">
<br class="">
3) There should be programmable alarm levels (both hi and lo) on all pressures and the gas flow, including the supply pressure (e.g. when the bottle gets close to being empty)<br class="">
<br class="">
4) Drift gas should ONLY be shut off if there is a sudden increase in gas flow indicating a rupture somewhere<br class="">
<br class="">
5) In the case of 4) or if the gas flow / pressure sink BELOW an adjustable level, the HV should be shut down (not the gas flow). This is to prevent sparks if ambient air can enter due to a rupture or due to empty supply bottles<br class="">
<br class="">
Anything else anyone can think of? - Sebastian<br class="">
<br class="">
<blockquote type="cite" class="">On Feb 13, 2019, at 1:06 PM, Narbe Kalantarians <<a href="mailto:narbe@jlab.org" class="">narbe@jlab.org</a>> wrote:<br class="">
<br class="">
Are there any particular details needed for the drift gas system, re: HV/LV failures, other than to shut off the drift gas system?<br class="">
<br class="">
From: Dsg-rtpc <<a href="mailto:dsg-rtpc-bounces@jlab.org" class="">dsg-rtpc-bounces@jlab.org</a>> on behalf of Marc Mcmullen <<a href="mailto:mcmullen@jlab.org" class="">mcmullen@jlab.org</a>><br class="">
Sent: Thursday, February 7, 2019 4:58 PM<br class="">
To: <a href="mailto:dsg-rtpc@jlab.org" class="">dsg-rtpc@jlab.org</a>; Mohammad Hattawy<br class="">
Subject: [Dsg-rtpc] RTPC Gas Controls Meeting Minutes<br class="">
<br class="">
Hi,<br class="">
<br class="">
Attached are the minutes/notes from the meeting with the RTPC/BONuS12 group. The information provided during the meeting has been added to the agenda is in italics.
<br class="">
<br class="">
Thanks<br class="">
Marc<br class="">
<RTPC Gas Controls Meeting_020719.docx>_______________________________________________<br class="">
Dsg-rtpc mailing list<br class="">
<a href="mailto:Dsg-rtpc@jlab.org" class="">Dsg-rtpc@jlab.org</a><br class="">
https://mailman.jlab.org/mailman/listinfo/dsg-rtpc<br class="">
</blockquote>
<br class="">
</div>
</div>
</blockquote>
</div>
<br class="">
</div>
</div>
</body>
</html>