<html><body><div style="color: rgb(0, 0, 0); font-family: arial,helvetica,sans-serif; font-size: 10pt;"><div>Gents,<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Thanks for the reply & feedback</div><div><br></div><div><br></div><div data-marker="__SIG_PRE__">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><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>From: </b>"Nicholas Sandoval" <sandoval@jlab.org><br><b>To: </b>"Scot Spiegel" <spiegel@jlab.org><br><b>Cc: </b>"Ruben Fair" <rfair@jlab.org>, "hallb-solenoid" <hallb-solenoid@jlab.org><br><b>Sent: </b>Monday, August 21, 2017 9:38:36 AM<br><b>Subject: </b>Re: [Hallb-solenoid] [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__">Hi Scot,<br><br>It was cryocon comms. All sensors are back <br><br>https://logbooks.jlab.org/entry/3482098<br><br>BesT Regards,<br>Nick<br><br>----- Original Message -----<br>From: "Scot Spiegel" <spiegel@jlab.org><br>To: "Ruben Fair" <rfair@jlab.org><br>Cc: hallb-solenoid@jlab.org<br>Sent: Monday, August 21, 2017 9:36:14 AM<br>Subject: Re: [Hallb-solenoid] [New Logentry] Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Solenoid Cooldown<br><br>R. <br><br>Has anyone done this? <br><br>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 <br><br><br>From: "Ruben Fair" <rfair@jlab.org> <br>To: "Pablo Campero" <campero@jlab.org>, "Brian Eng" <beng@jlab.org>, "Nicholas Sandoval" <sandoval@jlab.org>, "Scot Spiegel" <spiegel@jlab.org> <br>Sent: Sunday, August 20, 2017 6:19:16 AM <br>Subject: Fwd: [New Logentry] Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Solenoid Cooldown <br><br><br>Pablo, Brian <br><br>See note below <br><br>Can we swap to the backup temp sensor for TR8672? On Monday <br><br>Thanks <br><br>Ruben <br><br>Begin forwarded message: <br><br><br><br><br>From: kashy@jlab.org <br>Date: August 20, 2017 at 6:00:02 AM EDT <br>To: rfair@jlab.org , ghoshal@jlab.org , renuka@jlab.org , gyoung@jlab.org , burkert@jlab.org , josephm@jlab.org , rossi@jlab.org , ent@jlab.org , hogan@jlab.org , dinsley@jlab.org , mont@jlab.org , lung@jlab.org , stuart@jlab.org , kashy@jlab.org <br>Subject: [New Logentry] Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Solenoid Cooldown <br><br><br><br><br>Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Solenoid Cooldown <br><br><br>Lognumber 3482084 . Submitted by kashy on Sun, 08/20/2017 - 05:58. Logbooks: HBSOLENOID CLOG <br>Entry Makers: kashy <br>References: 3482067 - Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Solenoid Cooldown <br><br><br>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. <br><br>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. <br><br>I turned on alarms on the load cells <br><br>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. <br><br>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. <br><br><br>_______________________________________________<br>Hallb-solenoid mailing list<br>Hallb-solenoid@jlab.org<br>https://mailman.jlab.org/mailman/listinfo/hallb-solenoid<br></div></div></body></html>