aLIGO LHO Logbook

H1 SEI

hugh.radkins@LIGO.ORG - posted 07:30, Tuesday 27 January 2015 - last comment - 11:24, Tuesday 27 January 2015(16283)

Corner Station HEPI Pump Servo in Manual Mode for OLTF

Switched to manual control at 1510utc. Made one setpoint tweak at 1514. It looks like it will probably run without further adjustment (maintaining the ~70psi differential pressure) for a hour or more.

Comments related to this report

jeffrey.kissel@LIGO.ORG - 11:24, Tuesday 27 January 2015 (16296)

Link

J. Kissel, H. Radkins,

Corner Station HEPI Pump Servo Control was restored at 9:21 PST (17:16 UTC). 

For the record -- wasn't collection an Open Loop Transfer Function as indicated by the title, we merely wanted a few hours of data with the pump servo off to assess out-of-loop noise and impact on platform motion.