<html><body><div style="font-family: tahoma,new york,times,serif; font-size: 14pt; color: #009900"><div>fantastic.<br data-mce-bogus="1"></div><div><span id="transmark" style="display: none; width: 0px; height: 0px;"></span>congratulations to every one.<br></div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>From: </b>"Stepan Stepanyan" <stepanya@jlab.org><br><b>To: </b>hallb@jlab.org<br><b>Sent: </b>Thursday, September 7, 2017 3:02:31 PM<br><b>Subject: </b>[Hallb] Fwd: [Hallb-engineering] [New Logentry] Solenoid Cooldown - Cooling Basically Done<br></div><div><br></div><div data-marker="__QUOTED_TEXT__">We have superconducting solenoid!<br> <br> Congratulations to our magnet team, great job!<br><div class="moz-forward-container"><br> <br> -------- Forwarded Message --------<table class="moz-email-headers-table" cellspacing="0" cellpadding="0" border="0"><tbody><tr><th valign="BASELINE" nowrap="nowrap" align="RIGHT">Subject:</th><td>[Hallb-engineering] [New Logentry] Solenoid Cooldown - Cooling Basically Done</td></tr><tr><th valign="BASELINE" nowrap="nowrap" align="RIGHT">Date:</th><td>Thu, 7 Sep 2017 15:00:03 -0400 (EDT)</td></tr><tr><th valign="BASELINE" nowrap="nowrap" align="RIGHT">From:</th><td><a class="moz-txt-link-abbreviated" href="mailto:kashy@jlab.org" target="_blank" data-mce-href="mailto:kashy@jlab.org">kashy@jlab.org</a><br data-mce-bogus="1"></td></tr><tr><th valign="BASELINE" nowrap="nowrap" align="RIGHT">To:</th><td><a class="moz-txt-link-abbreviated" href="mailto:rfair@jlab.org" target="_blank" data-mce-href="mailto:rfair@jlab.org">rfair@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:ghoshal@jlab.org" target="_blank" data-mce-href="mailto:ghoshal@jlab.org">ghoshal@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:gyoung@jlab.org" target="_blank" data-mce-href="mailto:gyoung@jlab.org">gyoung@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:josephm@jlab.org" target="_blank" data-mce-href="mailto:josephm@jlab.org">josephm@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:rossi@jlab.org" target="_blank" data-mce-href="mailto:rossi@jlab.org">rossi@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:ent@jlab.org" target="_blank" data-mce-href="mailto:ent@jlab.org">ent@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:hogan@jlab.org" target="_blank" data-mce-href="mailto:hogan@jlab.org">hogan@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:mont@jlab.org" target="_blank" data-mce-href="mailto:mont@jlab.org">mont@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:lung@jlab.org" target="_blank" data-mce-href="mailto:lung@jlab.org">lung@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:stuart@jlab.org" target="_blank" data-mce-href="mailto:stuart@jlab.org">stuart@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:lassiter@jlab.org" target="_blank" data-mce-href="mailto:lassiter@jlab.org">lassiter@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:fansler@jlab.org" target="_blank" data-mce-href="mailto:fansler@jlab.org">fansler@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:gomez@jlab.org" target="_blank" data-mce-href="mailto:gomez@jlab.org">gomez@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:hallb-engineering@jlab.org" target="_blank" data-mce-href="mailto:hallb-engineering@jlab.org">hallb-engineering@jlab.org</a><br data-mce-bogus="1"></td></tr></tbody></table><br> <br><div id="center"><div id="main"><h1 class="node-title"><a href="https://logbooks.jlab.org/entry/3483774" rel="bookmark" target="_blank" data-mce-href="https://logbooks.jlab.org/entry/3483774">Solenoid Cooldown - Cooling Basically Done</a><br data-mce-bogus="1"></h1><div class="date-vitals"><p class="author-datetime">Lognumber <a href="https://logbooks.jlab.org/entry/3483774" class="lognumber" target="_blank" data-mce-href="https://logbooks.jlab.org/entry/3483774">3483774</a>. Submitted by <a href="https://logbooks.jlab.org/user/kashy" target="_blank" data-mce-href="https://logbooks.jlab.org/user/kashy">kashy</a> on Thu, 09/07/2017 - 14:55.</p><table class="field-vitals"><tbody><tr><th>Logbooks:</th><td><a href="https://logbooks.jlab.org/book/hbsolenoid" target="_blank" data-mce-href="https://logbooks.jlab.org/book/hbsolenoid">HBSOLENOID</a> <a href="https://logbooks.jlab.org/book/clog" target="_blank" data-mce-href="https://logbooks.jlab.org/book/clog">CLOG</a><br data-mce-bogus="1"></td></tr><tr><th>References:</th><td><a href="https://logbooks.jlab.org/entry/3483741" target="_blank" data-mce-href="https://logbooks.jlab.org/entry/3483741">3483741 - Follow-up Re: Solenoid Cooldown</a><br data-mce-bogus="1"></td></tr></tbody></table></div><div class="logentry node-content"><p>Congratulations to ALL, A major step has been completed today.<br> The Solenoid is cold and we have Liquid Helium in both the lead reservoir and Magnet reservoir!<br> I will continue to tune the control loops to improve stability.<br> Lead flow controllers were replaced this morning and are working perfectly.</p><p>One major sticking point to powering the magnet is completion of the Hi-Pot test.<br> At present we have a team looking at a low resistance to ground of the water cooled lead "A".</p><p>The superconducting liquid probes have been disconnected and are being investigated.<br> Helium flow from ESR has reduced from ~10g/s to ~6g/s</p></div><div class="attachment-box"><div class="image-wrapper"><img class="image-style-plentybig" src="cid:part7.8BCBEB35.AF705A86@jlab.org" alt="" title="SST showing LHe in Reservoirs and Lead Flow
controllers at setpoint" data-mce-src="cid:part7.8BCBEB35.AF705A86@jlab.org" width="960" height="555"></div><div class="image-wrapper"><img class="image-style-plentybig" src="cid:part8.C5213966.92E886B2@jlab.org" alt="" title="Coil Temperature Sensors all below 5K " data-mce-src="cid:part8.C5213966.92E886B2@jlab.org" width="955" height="713"></div><div class="image-wrapper"><img class="image-style-plentybig" src="cid:part9.FDBBC6DC.A8F17084@jlab.org" alt="" title="Helium Channel cooling plate temperatures" data-mce-src="cid:part9.FDBBC6DC.A8F17084@jlab.org" width="955" height="713"></div><div class="image-wrapper"><img class="image-style-plentybig" src="cid:part10.1B66134F.C422CA92@jlab.org" alt="" title="Heat Shield Temperatures ( all below 80K will
likely change as magnet stabilizes - could go up or
down...)" data-mce-src="cid:part10.1B66134F.C422CA92@jlab.org" width="955" height="713"></div><div class="image-wrapper"><img class="image-style-plentybig" src="cid:part11.04A1C065.40A14BAF@jlab.org" alt="" title="Load Cells ( More investigation needed as some
of the Z supports went way down.)" data-mce-src="cid:part11.04A1C065.40A14BAF@jlab.org" width="910" height="628"></div></div></div></div></div><br>_______________________________________________<br>Hallb mailing list<br>Hallb@jlab.org<br>https://mailman.jlab.org/mailman/listinfo/hallb<br></div></div></body></html>