<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>Scot,</div><div><br data-mce-bogus="1"></div><div>Apparently we lost comms with Cryocon1 over the weekend so I think this is why this sensor (and 5 others) were not updating.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Nick has restarted the Cryocon this morning and it's working again.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Ruben<br data-mce-bogus="1"></div><div><br></div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>From: </b>"Scot Spiegel" <spiegel@jlab.org><br><b>To: </b>"Ruben Fair" <rfair@jlab.org><br><b>Cc: </b>hallb-solenoid@jlab.org<br><b>Sent: </b>Monday, August 21, 2017 9:36:14 AM<br><b>Subject: </b>Re: [New Logentry] Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Solenoid Cooldown<br></div><div><br></div><div data-marker="__QUOTED_TEXT__"><div style="color: rgb(0, 0, 0); font-family: arial,helvetica,sans-serif; font-size: 10pt;"><div>R.<br></div><br><div>Has anyone done this?<br></div><br><div>Scot Spiegel<br>Physics / Hall D<br>JSA Jefferson Lab<br>12000 Jefferson Ave.<br>Bldg. 55 Rm. 1546-24<br>Newport News, VA. 23606<br>Ph. 757-536-5900<br>Wk. 757-269-5900</div><br><hr id="zwchr"><div><b>From: </b>"Ruben Fair" <rfair@jlab.org><br><b>To: </b>"Pablo Campero" <campero@jlab.org>, "Brian Eng" <beng@jlab.org>, "Nicholas Sandoval" <sandoval@jlab.org>, "Scot Spiegel" <spiegel@jlab.org><br><b>Sent: </b>Sunday, August 20, 2017 6:19:16 AM<br><b>Subject: </b>Fwd: [New Logentry] Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Solenoid Cooldown<br></div><br><div><div><br>Pablo, Brian</div><br><div>See note below</div><br><div>Can we swap to the backup temp sensor for TR8672? On Monday</div><br><div>Thanks</div><br><div>Ruben<br><br>Begin forwarded message:<br><br></div><blockquote><div><b>From:</b> <a href="mailto:kashy@jlab.org" target="_blank">kashy@jlab.org</a><br><b>Date:</b> August 20, 2017 at 6:00:02 AM EDT<br><b>To:</b> <a href="mailto:rfair@jlab.org" target="_blank">rfair@jlab.org</a>, <a href="mailto:ghoshal@jlab.org" target="_blank">ghoshal@jlab.org</a>, <a href="mailto:renuka@jlab.org" target="_blank">renuka@jlab.org</a>, <a href="mailto:gyoung@jlab.org" target="_blank">gyoung@jlab.org</a>, <a href="mailto:burkert@jlab.org" target="_blank">burkert@jlab.org</a>, <a href="mailto:josephm@jlab.org" target="_blank">josephm@jlab.org</a>, <a href="mailto:rossi@jlab.org" target="_blank">rossi@jlab.org</a>, <a href="mailto:ent@jlab.org" target="_blank">ent@jlab.org</a>, <a href="mailto:hogan@jlab.org" target="_blank">hogan@jlab.org</a>, <a href="mailto:dinsley@jlab.org" target="_blank">dinsley@jlab.org</a>, <a href="mailto:mont@jlab.org" target="_blank">mont@jlab.org</a>, <a href="mailto:lung@jlab.org" target="_blank">lung@jlab.org</a>, <a href="mailto:stuart@jlab.org" target="_blank">stuart@jlab.org</a>, <a href="mailto:kashy@jlab.org" target="_blank">kashy@jlab.org</a><br><b>Subject:</b> <b>[New Logentry] Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Solenoid Cooldown</b><br><br></div></blockquote><blockquote><div>
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<a href="https://logbooks.jlab.org/entry/3482084" target="_blank" rel="bookmark">Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Solenoid Cooldown</a>
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Lognumber <a class="lognumber" href="https://logbooks.jlab.org/entry/3482084" target="_blank">3482084</a>. Submitted by <a href="https://logbooks.jlab.org/user/kashy" target="_blank">kashy</a> on Sun, 08/20/2017 - 05:58. </p>
<table class="field-vitals"><tbody><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hbsolenoid" target="_blank">HBSOLENOID</a> <a href="https://logbooks.jlab.org/book/clog" target="_blank">CLOG</a><br data-mce-bogus="1"></td></tr><tr><th>Entry Makers: </th><td>kashy</td></tr><tr><th>References: </th><td><a href="https://logbooks.jlab.org/entry/3482067" target="_blank">3482067 - Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Solenoid Cooldown</a><br data-mce-bogus="1"></td></tr></tbody></table></div>
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<p>The shield cooling rate dropped appeared to drop from 0.4K/hr to 0.2K/hr at ~22:20 on 8/19. Temperature sensor TR8672 stopped changing at that time. It may be a bad sensor or something else. Other temperature of the shield appear to be dropping at the original rate, so I expect that it is just a sensor problem. This sensor is located in the SST and we should be able to switch to its backup on Monday. There is no control issue.</p>
<p>We are using coil resistance to calculate the bulk temperature of each coil, coil 5 dropped below the water freezing point early this morning. Now its 272K. </p>
<p>I turned on alarms on the load cells </p>
<p>Radial bottom will alarm at 10,000lbs except the beam right bottom is set for 11,000<br>
Radial top will alarm if below 300 or above 1000lbs<br>
Axial (Z) supports will alarm if above 300lbs.<br>
All of these are well below critical limits but will give us a heads up if things start to change.</p>
<p>To assist in cooling the shield a bit faster I have changed the PID setpoint of EV8670BY from 0.12atm to 0.32atm. Thus far the indicated cooling rate of the shield has increased to 0.3K/hr. This will reduce again to 0.2K/hr after the shield has cooled. Once the spare TD8672 has been put on line the displayed rate should go back to ~0.4K/hr.</p>
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