Reports until 09:52, Tuesday 14 January 2020
H1 PEM
robert.schofield@LIGO.ORG - posted 09:52, Tuesday 14 January 2020 (54493)
LVEA vetex magnetometer alignment changed

Philippe asked me to check the orientation of the vertex magnetometer because the signals were inconsistent with expected field directions. I found that the magnetometer was moved, probably during the October 2019 break, such that the Y direction of the magnetometer was off by about 45 degrees, pointing +Y, -X. I moved the tripod, matching the numbers on the leg to the numbered marks on the floor, and the proper orientation was restored. I did this at about 17:30 UTC.  The affected channels were: H1:PEM-CS_MAG_LVEA_VERTEX_X_DQ and Y and Z. I also checked the EY VEA magnetometer and it was properly oriented.