<html><body><div style="font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000"><div>Hi Nick,<br></div><div><br data-mce-bogus="1"></div><div>Have you gotten a reply from Facilities about what the lcw:92_Flow_Makeup is?<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Best regards,<br data-mce-bogus="1"></div><div>Tyler<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>"Brian Eng" <beng@jlab.org><br><b>To: </b>"Nick Sandoval" <sandoval@jlab.org><br><b>Cc: </b>"dsg-hallb magnets" <dsg-hallb_magnets@jlab.org><br><b>Sent: </b>Tuesday, November 6, 2018 10:25:04 AM<br><b>Subject: </b>Re: [Dsg-hallb_magnets] [New Logentry] Follow-up Re: Solenoid fast dump at 2416 A<br></div><div><br></div><div data-marker="__QUOTED_TEXT__">Nick,<br><br>I updated the archive plots I made yesterday to include B_SOL:MPS:Status.BF<br><br>https://userweb.jlab.org/~beng/images/Solenoid%20Fast%20Dumps%20&%20LCW/<br><br>As expected that bit goes high on all the ones that we don't have a known cause for, i.e. all the dumps that are only a number in the filename.<br>There are a few dumps from full field without that bit but with a well understood reason, e.g. 14 & 18.<br><br>10 is really the only outlier, but since we don't have any FastDAQ data for that dump there's not much we can say about it.<br><br>----- Original Message -----<br>> From: "Nick Sandoval" <sandoval@jlab.org><br>> To: "Pablo Campero Rojas" <campero@jlab.org><br>> Cc: "dsg-hallb magnets" <dsg-hallb_magnets@jlab.org><br>> Sent: Tuesday, November 6, 2018 5:58:22 AM<br>> Subject: Re: [Dsg-hallb_magnets] [New Logentry] Follow-up Re: Solenoid fast dump at 2416 A<br><br>> Hi Pablo,<br>> <br>> Could you update your compiled Solenoid fast dumps list that Brian had<br>> referenced. For the updated list please insert another column for the MPS<br>> internal water flow BIT 16(TRUE/FALSE).<br>> <br>> The hope being that we have at least (1) full field fast dump without this bit<br>> present, and that any other fast dumps without this bit present were all prior<br>> to our final noise reduction and QD threhold increases.<br>> <br>> Thanks,<br>> <br>> Nick<br>> <br>> ----- Original Message -----<br>> From: "Pablo Campero Rojas" <campero@jlab.org><br>> To: "Amrit Yegneswaran" <yeg@jlab.org><br>> Cc: jonesc@jlab.org, "dsg-hallb magnets" <dsg-hallb_magnets@jlab.org><br>> Sent: Monday, November 5, 2018 11:57:50 AM<br>> Subject: Re: [Dsg-hallb_magnets] [New Logentry] Follow-up Re: Solenoid fast dump<br>> at 2416 A<br>> <br>> Hello,<br>> <br>> Correlation of the PV LCW92 signal with the MPS water flow and Dump contact<br>> signals are showed in the attached plot.<br>> As we can see, the spikes on LCW92 signal starts ~ 10 min before the MPS Dump<br>> Contact signal trips.<br>> Also noticed that the MPS bit BF used to monitor MPS internal status for water<br>> flow trips at the same time of the MPS dump contact within +/- 500 ms.<br>> <br>> Regards,<br>> Pablo<br>> <br>> <br>> From: "Amrit Yegneswaran" <yeg@jlab.org><br>> To: "Brian Eng" <beng@jlab.org><br>> Cc: jonesc@jlab.org, "dsg-hallb magnets" <dsg-hallb_magnets@jlab.org><br>> Sent: Monday, November 5, 2018 11:32:31 AM<br>> Subject: Re: [Dsg-hallb_magnets] [New Logentry] Follow-up Re: Solenoid fast dump<br>> at 2416 A<br>> <br>> i concur brian.<br>> who is the person who tells us what this lcw92 PV measures?<br>> which brings up the question, tyler posed: how come the torus is unaffected?<br>> <br>> i'm informed by amanda, pablo, peter, and tyler that there is a correlation<br>> between this PV and MPS water flow.<br>> could it be the water flow hiccups long enough to initiate the dump?<br>> but wouldn't this affect all the halls or is this 92 signal only for hallb?<br>> are the thresholds/flows for the solenoid and torus different?<br>> <br>> <br>> <br>> <br>> <br>> <br>> <br>> From: "Brian Eng" <beng@jlab.org><br>> To: sandoval@jlab.org<br>> Cc: jonesc@jlab.org, "dsg-hallb magnets" <dsg-hallb_magnets@jlab.org><br>> Sent: Monday, November 5, 2018 10:53:49 AM<br>> Subject: Re: [Dsg-hallb_magnets] [New Logentry] Follow-up Re: Solenoid fast dump<br>> at 2416 A<br>> <br>> Did we ever find out what this PV actually means?<br>> <br>> After going through the 21 fast dumps that Pablo put in his summary table either<br>> we have an explanation for the dump (QDs, Cryo, etc) or for _all_ the unknown<br>> ones there's spikes on this PV, basically if it goes above 5 the Solenoid is<br>> going to dump. Scrolling through the archives I've only found a few cases where<br>> the magnet is on (at low current < 500 A) and there's spikes above 5 (but < 3<br>> min) where it didn't dump. All the other spikes in that PV the Solenoid was<br>> off.<br>> <br>> I think finding out what exactly this PV is will help narrow down what in the<br>> MPS is causing the dump. Flow? Conductivity? Something else? Also why isn't the<br>> Torus MPS effected in the same way.<br>> <br>> ----- Original Message -----<br>>> From: sandoval@jlab.org<br>>> To: jonesc@jlab.org, "dsg-hallb magnets" <dsg-hallb_magnets@jlab.org><br>>> Sent: Friday, November 2, 2018 10:30:06 AM<br>>> Subject: [Dsg-hallb_magnets] [New Logentry] Follow-up Re: Solenoid fast dump at<br>>> 2416 A<br>> <br>>> Follow-up Re: Solenoid fast dump at 2416 A<br>>> <br>>> <br>>> * Edit<br>>> * Delete<br>>> <br>>> <br>>> Lognumber 3619729 . Submitted by sandoval on Fri, 11/02/2018 - 10:27 . Logbooks:<br>>> HBLOG HBSOLENOID<br>>> References: 3619588 - Solenoid fast dump at 2416 A<br>>> <br>>> <br>>> Seems to be coorelation of Hall B solenoid fast dumps with lcw:92_Flow_Makeup<br>>> <br>>> Not sure what this PV actually means for hall B<br>> _______________________________________________<br>> Dsg-hallb_magnets mailing list<br>> Dsg-hallb_magnets@jlab.org<br>> https://mailman.jlab.org/mailman/listinfo/dsg-hallb_magnets<br>> <br>> _______________________________________________<br>> Dsg-hallb_magnets mailing list<br>> Dsg-hallb_magnets@jlab.org<br>> https://mailman.jlab.org/mailman/listinfo/dsg-hallb_magnets<br>> <br>> _______________________________________________<br>> Dsg-hallb_magnets mailing list<br>> Dsg-hallb_magnets@jlab.org<br>> https://mailman.jlab.org/mailman/listinfo/dsg-hallb_magnets<br>> _______________________________________________<br>> Dsg-hallb_magnets mailing list<br>> Dsg-hallb_magnets@jlab.org<br>> https://mailman.jlab.org/mailman/listinfo/dsg-hallb_magnets<br>_______________________________________________<br>Dsg-hallb_magnets mailing list<br>Dsg-hallb_magnets@jlab.org<br>https://mailman.jlab.org/mailman/listinfo/dsg-hallb_magnets<br></div></div></body></html>