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Thank you for the write-up. It mostly captures our issues, although I disagree with the statement
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<p class=""><span style="font-size: 11.000000pt; font-family: 'Calibri'" class="">In reality, </span><span style="font-family: Calibri; font-size: 11pt;" class="">depending on the closing order of those three valves, there is enough line between </span><span style="font-family: Calibri; font-size: 11pt;" class="">the
MFC and SVBT108 to where gas can still flow to pressurize the line </span><span style="font-family: Calibri; font-size: 11pt;" class="">between the target gas pad in the </span><span style="font-family: Calibri; font-size: 11pt;" class="">hall between the
MFC and SVBT108). </span></p>
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<div>as I have repeatedly explained before. *)</div>
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<div>Regardless of the underlying issue, we will be awaiting detailed instructions on how to manually open the MFC valve to 100%. As your write-up points out, we can easily loose 45 min (3x(20-5)) during a regular daily target purge, and more than twice that
during a target gas CHANGE (which requires 6 purge cycles) due to the difference between “fast fill” and “slow fill”. Even if we can only cut this time down by 40% (= the difference between 200 sccm and 330 sccm), this would potentially save 12 hours of beam
time which will be in short supply once we come back up.</div>
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<div>Thanks, and best greetings - Sebastian</div>
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<div>*) For those new to this exchange: T<span style="font-family: TimesNewRomanPSMT;" class="">o sustain a REAL flow of 200 sccm, you need to have a significant reservoir of volume at different pressure on BOTH sides of the flow meter (to flow FROM and to
flow INTO), not just on the downstream side (the hundreds of feet of gas line between pad and gas panel). If SVBT100 and 102 are closed (ignoring 108), then the UPstream volume is hardly more than a few 10’s of ccm (I estimate 30 ccm) so after a minute that
volume would be totally depleted at 200 sccm.</span></div>
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<div class="">On Mar 17, 2020, at 1:02 PM, Amrit Yegneswaran <<a href="mailto:yeg@jlab.org" class="">yeg@jlab.org</a>> wrote:</div>
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excellent, tyler and brian<br class="">
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<div id="divRplyFwdMsg" dir="ltr" class=""><font face="Calibri, sans-serif" style="font-size: 11pt;" class=""><b class="">From:</b><span class="Apple-converted-space"> </span>Dsg-rtpc <<a href="mailto:dsg-rtpc-bounces@jlab.org" class="">dsg-rtpc-bounces@jlab.org</a>>
on behalf of Tyler Lemon <<a href="mailto:tlemon@jlab.org" class="">tlemon@jlab.org</a>><br class="">
<b class="">Sent:</b><span class="Apple-converted-space"> </span>Tuesday, March 17, 2020 12:58 PM<br class="">
<b class="">To:</b><span class="Apple-converted-space"> </span><a href="mailto:dsg-rtpc@jlab.org" class="">dsg-rtpc@jlab.org</a> <<a href="mailto:dsg-rtpc@jlab.org" class="">dsg-rtpc@jlab.org</a>><br class="">
<b class="">Cc:</b><span class="Apple-converted-space"> </span>Patrizia Rossi <<a href="mailto:rossi@jlab.org" class="">rossi@jlab.org</a>><br class="">
<b class="">Subject:</b><span class="Apple-converted-space"> </span>[Dsg-rtpc] Summary of BoNuS target purge issues - March 17, 2020</font>
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Hello,</div>
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Attached is a summary of the issues discussed over email yesterday and today for the BoNuS target purging.</div>
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Best regards,</div>
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Tyler<br class="">
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<span style="caret-color: rgb(0, 0, 0); font-family: TimesNewRomanPSMT; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">_______________________________________________</span><br style="caret-color: rgb(0, 0, 0); font-family: TimesNewRomanPSMT; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<span style="caret-color: rgb(0, 0, 0); font-family: TimesNewRomanPSMT; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Dsg-rtpc
mailing list</span><br style="caret-color: rgb(0, 0, 0); font-family: TimesNewRomanPSMT; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<span style="caret-color: rgb(0, 0, 0); font-family: TimesNewRomanPSMT; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class=""><a href="mailto:Dsg-rtpc@jlab.org" class="">Dsg-rtpc@jlab.org</a></span><br style="caret-color: rgb(0, 0, 0); font-family: TimesNewRomanPSMT; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<span style="caret-color: rgb(0, 0, 0); font-family: TimesNewRomanPSMT; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class=""><a href="https://mailman.jlab.org/mailman/listinfo/dsg-rtpc" class="">https://mailman.jlab.org/mailman/listinfo/dsg-rtpc</a></span></div>
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