Displaying report 1-1 of 1.
Reports until 10:27, Friday 17 April 2015
H1 SEI
hugh.radkins@LIGO.ORG - posted 10:27, Friday 17 April 2015 (17927)
Regular glitch in HEPI EndY Pressure Sensor

Summary: Been going on since late February (~2-24) at ~24 hour period (last week at least.)  It is not obvious in the In-Loop or Out-of-Loop HEPI position sensors second trends.

See attached for 70 day trends showing the glitch being revealed after getting the sensor quiet (got lucky) and continuing to today.  Second plot zooms into glitch early this week 4-12 ~0400utc.  This one is a double glitch; they are not always the same but the first three this week are the sign and about the same magnitude.

Still looking for cause and other potential affects.

Images attached to this report
Displaying report 1-1 of 1.