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Yes Chris,</div>
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This is what was decided yesterday evening with Rolf and Javier.</div>
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B gets throttled first</div>
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A gets throttled next if needed (hopefully we never get to this)<br>
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C gets throttled last (if we get to this there is a really big problem)</div>
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I see you have implemented the slight change that we discussed to start the throttling when the cold box output pressure (as read on PI671) goes
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below 2.95 for Hall B, <br>
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below 2.90 for Hall A <br>
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below 2.85 for Hall C</div>
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and these are .05 less than yesterdays values which may help lower the number of throttles.</div>
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If possible (and if needed) I think it would be good to lower each of these another 0.05.</div>
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Also you might want to increase the spacing.</div>
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So</div>
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2.90 for B</div>
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2.80 for A</div>
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2.70 for C</div>
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The other thing that could be helpful for stability is to increase the setpoint for the valve to the dewar (EV6761) from 3.05 to 3.1</div>
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Thanks</div>
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Dave</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Chris Perry<br>
<b>Sent:</b> Friday, February 22, 2019 8:17 AM<br>
<b>To:</b> Javier Gomez<br>
<b>Cc:</b> Jonathan Creel; Rolf Ent; David Kashy; Patrizia Rossi; esr-users<br>
<b>Subject:</b> Re: Hall cryo recovery priority </font>
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<p style="margin-top:0; margin-bottom:0">Javier,</p>
<p style="margin-top:0; margin-bottom:0"> Just to be clear, with priority set to be C,A,B, I will set the controls so that B is throttled first followed by A then C.</p>
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<p style="margin-top:0; margin-bottom:0">-Chris<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Javier Gomez<br>
<b>Sent:</b> Thursday, February 21, 2019 5:50 PM<br>
<b>To:</b> Chris Perry<br>
<b>Cc:</b> Jonathan Creel; Rolf Ent; David Kashy; Patrizia Rossi; esr-users<br>
<b>Subject:</b> Hall cryo recovery priority </font>
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<div class="x_PlainText">Hi Chris,<br>
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Rolf, David and I went over the impact of various scenarios if the flow of cryogens to Halls A, B and C must be throttled back - please set the hall priority to be C, A, B. We will update the order when the current experiment in Hall A, APEX, ends.<br>
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Thanks - Javier</div>
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