aLIGO LHO Logbook

H1 CDS

david.barker@LIGO.ORG - posted 15:53, Thursday 18 June 2026 (90670)

CP1 LN2 Level Sensor Fixed. CP1 under PID control and alarms have been restored.

At 15:03 Gerardo switched CP1 level control from manual to PID. We verified that the PID settings are still as they were when the LN2 level sensor stopped working on 5th August 2021.

I have added a ndscope trender which shows the pump level and the PID LLCV control value cp1_1_day_trend

CP1 pump level control alarms were restored to the alarms system, alarm level set to <= 85% and >=99%.

--- h0ve_configuration.xml (revision 7482)
+++ h0ve_configuration.xml (working copy)
@@ -9,30 +9,26 @@



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+<Channel name="H0:VAC-LY_CP1_LT100_PUMP_LEVEL_PCT" low="8.5e+01" high="9.9e+01" description="CP1 Pump LN2 Level">
+ <Contact address="5094380824@vtext.com" hot="15" cool="5" description="C:Richard McCarthy"></Contact>
+ <Contact address="5094380826@vtext.com" hot="15" cool="5" description="C:David Barker"></Contact>
+ <Contact address="5094380828@vtext.com" hot="15" cool="5" description="C:Gerardo Moreno"></Contact>
+ <Contact address="2083011360@vtext.com" hot="15" cool="5" description="C:Travis Sadecki"></Contact>
+ <Contact address="rjmcc@caltech.edu" hot="5" cool="2" description="E:Richard McCarthy"></Contact>
+ <Contact address="dbarker3@caltech.edu" hot="5" cool="2" description="E:Dave Barker"></Contact>
+ <Contact address="gmoreno@caltech.edu" hot="5" cool="2" description="E:Gerardo Moreno"></Contact>
+ <Contact address="tsadecki@caltech.edu" hot="5" cool="2" description="E:Travis Sadecki"></Contact>
+</Channel>
+<Channel name="H0:VAC-LY_CP1_LT100_PUMP_LEVEL_PCT_ERROR" low="-5.0e-01" high="1.0e+00" description="CP1 Pump LN2 Level ERROR">
+ <Contact address="5094380824@vtext.com" hot="15" cool="5" description="C:Richard McCarthy"></Contact>
+ <Contact address="5094380826@vtext.com" hot="15" cool="5" description="C:David Barker"></Contact>
+ <Contact address="5094380828@vtext.com" hot="15" cool="5" description="C:Gerardo Moreno"></Contact>
+ <Contact address="2083011360@vtext.com" hot="15" cool="5" description="C:Travis Sadecki"></Contact>
+ <Contact address="rjmcc@caltech.edu" hot="5" cool="2" description="E:Richard McCarthy"></Contact>
+ <Contact address="dbarker3@caltech.edu" hot="5" cool="2" description="E:Dave Barker"></Contact>
+ <Contact address="gmoreno@caltech.edu" hot="5" cool="2" description="E:Gerardo Moreno"></Contact>
+ <Contact address="tsadecki@caltech.edu" hot="5" cool="2" description="E:Travis Sadecki"></Contact>
+</Channel>

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