Reports until 15:27, Friday 01 November 2019
H1 CAL (CAL)
richard.savage@LIGO.ORG - posted 15:27, Friday 01 November 2019 - last comment - 17:43, Monday 11 November 2019(52893)
Updated Pcal force and displacement coefficients with uncertainty estimates

DriptaB, EthanP, RickS

Attached below are tables that list force and displacement coefficients for the Pcal power sensors in the transmitter (Tx) and receiver (Rx) modules at the end stations at both LHO and LLO and their associated uncertainties..

Also attached below are tables listing the components of the force coefficients and their statistical and systematic uncertainties.  The elements in square bracket contribute to the overall uncertainty estimates.

The displacement uncertainties include contributions from unintended rotation of the ETMs (0.38%, larger for O3 due to the extreme iterferometer beam miscentering on the ETMs to minimize impact of point absorbers) and measurement of the ETM masses (0.007%).

Note that force coefficiets have changed slightly (order 0.05%) due to how the mean values are now calculated, and this results in slight changes in the displacement coefficients as well.

Epics records for force coefficients have not been changed, so the numbers from yesterday are the reference values for the O3b run.  Pcal coefficients are expected to change slightly as more measurements infom estimates of mean parameter values and standard errors on the means are updated.

Non-image files attached to this report
Comments related to this report
dripta.bhattacharjee@LIGO.ORG - 17:43, Monday 11 November 2019 (53166)
We found an error in the LHOX ETM mass, it was off by 1g. We earlier reported it to be 39656g, the correct ETM mass is 39657g. The updated tables with the correct ETM mass and displacement coefficients is attached. This correction does not change the uncertainty in the displacement coefficient, it is still 0.54% for both Tx and Rx at LHO X. The relative change has however decreased by 0.01% for both Tx and Rx at LHO X
Non-image files attached to this comment