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Hi Sebastian,<br>
<br>
Hall B has a He4 gas supply system with connections available on L1
space frame. If you prefer He for the purge, it's a simple matter
to run a line to the valve panel from the supply header. <br>
<br>
Do you want an absolute or differential pressure transducer for the
target purge volume? I have placed an absolute Baratron on the valve
panel diagram. See attached valve panel diagram.<br>
<br>
Cheers,<br>
George<br>
<br>
<div class="moz-cite-prefix">On 8/9/2018 9:14 AM, kuhn wrote:<br>
</div>
<blockquote type="cite"
cite="mid:EDCE28B5-4307-42C5-A786-7D0BA67FC582@jlab.org">
<pre wrap="">Just for clarification: The region between ground foil and cathode is INTERNALLY connected to the drift region (inside the RTPC itself). The slight overpressure we were talking about can be achieved by properly dimensioning that internal connection and the gas flow. So all we need is 2 gas lines for that inner volume (split from a single gas line) and a single exhaust gas line from the RTPC.
The question about the buffer volume (between target and ground foil) is separate. Originally we wanted to use pure 4He for that buffer region. Recently, we have considered using the same gas mix (He/CO2) just to simplify the setup. But in any case this needs a separate inlet and outlet gas line, with bubbler, pressure sensor, and flow meter.
Sebastian
</pre>
<blockquote type="cite">
<pre wrap="">On Aug 9, 2018, at 8:36 AM, George Jacobs <a class="moz-txt-link-rfc2396E" href="mailto:jacobsg@jlab.org"><jacobsg@jlab.org></a> wrote:
Hi Carlos,
Correct and correct. It's best to split the target and cathode purge gas as close to the RTPC connections as practical.
Cheers,
George
On 8/8/2018 5:58 PM, Carlos Ayerbe wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi George,
thank you very much. Just to be sure that there is no confusion from my side.
- "To RTPC" is the line to the drift region, which we were always working. This line is 1/2", correct?
- "To Target and Cathode Volumes" are the lines to the regions we discussed today. It is one line in the scheme, but it is split in two afterwards, isn't it?. Also, they are 1/4", correct?
Thank you
-Carlos
----- Original Message -----
From: "George Jacobs"
<a class="moz-txt-link-rfc2396E" href="mailto:jacobsg@jlab.org"><jacobsg@jlab.org></a>
To:
<a class="moz-txt-link-abbreviated" href="mailto:dsg-rtpc@jlab.org">dsg-rtpc@jlab.org</a>, "Carlos Ayerbe-Gayoso (<a class="moz-txt-link-abbreviated" href="mailto:gayoso@jlab.org">gayoso@jlab.org</a>)" <a class="moz-txt-link-rfc2396E" href="mailto:gayoso@jlab.org"><gayoso@jlab.org></a>
Sent: Wednesday, 8 August, 2018 17:07:32
Subject: RTPC Valve panel revision - added target and cathode purge gas supply - see attachment
Hi Carlos,
Please find attached pdf
I have added the gas supply for the purge of the target area and the cathode ( middle) volumes along with the bubblers for each.
I will have the P&I diagram revision completed in a couple days.
Cheers,
George
</pre>
</blockquote>
<pre wrap="">
--
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606
(office) 757-269-7021
(cell) 757-876-0480
(email)
<a class="moz-txt-link-abbreviated" href="mailto:jacobsg@jlab.org">jacobsg@jlab.org</a>
(website)
<a class="moz-txt-link-freetext" href="https://userweb.jlab.org/~jacobsg">https://userweb.jlab.org/~jacobsg</a>
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<pre wrap="">
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</blockquote>
<br>
<pre class="moz-signature" cols="72">--
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606
(office) 757-269-7021
(cell) 757-876-0480
(email) <a class="moz-txt-link-abbreviated" href="mailto:jacobsg@jlab.org">jacobsg@jlab.org</a>
(website) <a class="moz-txt-link-freetext" href="https://userweb.jlab.org/~jacobsg">https://userweb.jlab.org/~jacobsg</a></pre>
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