Reports until 16:35, Thursday 08 January 2015
H1 SUS
betsy.weaver@LIGO.ORG - posted 16:35, Thursday 08 January 2015 (15953)
More on QUAD earthquake stops

Attached is a trend of the average LVEA temperature showing the daily ~0.2 deg C temp swing.  The plot is for the month of August 2014 when we were finishing installation of the vertex.  When we are vented and adjusting the EQ stops of a suspension we may see a ~0.06mm change in the gap of the EQ stops around the barrels of the PUM and Test Masses in the QUAD daily.   (0.2degC change x ~0.3mm/1degC temp change = 0.06mm)

This is pretty negligible.  Phew.  However, this temp change pitches the suspension, so now I'll try to find out by how much.  To be continued...

Images attached to this report