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Reports until 04:21, Sunday 30 August 2015
H1 CAL
kiwamu.izumi@LIGO.ORG - posted 04:21, Sunday 30 August 2015 - last comment - 09:26, Monday 31 August 2015(21023)
3rd round of calibration measurements for ETMY actuator scale factors

I have completed a set of measurements that is necessary for nailing down the ETMY actuation scale factors. This is a third round of the measurements in order to study repeatability and systematic errors. The measurement data can be found at the follwong places.

 

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jeffrey.kissel@LIGO.ORG - 09:26, Monday 31 August 2015 (21049)
Link 

J. Kissel, K. Izumi

I've process the results from the above aLOG using the same model I had used for LHO aLOGs 21015, just to get something out the door for review at today's calibration meeting. The results look encouragingly consistent with Wednesday's (LHO aLOG 20940) and Friday's (LHO aLOG 21005) results.

Again, the next steps are to
- functionalize the analysis scripts so we can easily process future measurements, 
- have those functions spit out their individual measurement results so they can be compared with each other (the comparison of which is another function to write), and
- make sure that all the scripts are using the output of the latest DARM model and parameter set, instead of recreating a naive model from the matlab QUAD's [m/N] and knowledge of the electronics chain.
- finish processing results from all the of the electronics chain measurements to identify if frequency-dependent systematics lie in there
- Update / refine the DARM model parameters to squash the frequency-dependendent residual to as small as possible, such that we can be confident in professing number with properly quantified 
uncertainty.

What has NOT been included in the naive actuation model:
- 16k IOP up-sampling filter
- Analog AA filter
- Any of the un- or poorly-compensated poles and zeros of the ESD drivers
- The recently found mis-match between expected and reality regarding the UIM driver's poles and zeros (LHo aLOG 20846)
I have a high degree of confidence that these are the reasons for the residual frequency dependence. In other words, these be resolved once I switch to using the full DARM model's actuation chain. That being said, suggestions are welcome as to what else the discrepancies might be.
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