D. Barker, J. Batch, K. Izumi, S. Karki, J. Kissel, R. Savage, D. Tuyenbayev, C. Vorvick

We've finished the bulk of the invasive calibration work today. The PCAL team needs a little bit more time tomorrow, but they'll come in early such that they're finished before 12p PT. Here's a recap of this past day's activity:

J. Kissel, K. Izumi
Retook free swinging Michelson measurements, this time using ETMX ESD and the Full DC Readout DARM sensor as another middle man to propagate the ITM drive to MICH [m] through to all three stages of  ETMY. Preliminary results from yesterday indicate good agreement between model and measurement for at least ETMY L2 between 4-7 [Hz], with the statistical uncertainty and measurement scatter blowing up below 4 [Hz]. (Detailed analysis and aLOG to come)

K. Izumi
Adding ETMX L3 drive to ALS DIFF to the collection of transfer functions so we can propagate the ALS DIFF VCO calibration to ETMY using the same ETMX to DARM and ETMY to DARM TFs taken for the above free-swinging MICH. (Detailed analysis and aLOG to come)

J. Kissel, D. Barker, J. Batch
Updated the CAL_INJ_MASTER, PCAL_MASTER, and CAL_CS_MASTER library parts to 
     - obtain some updates to the hardware injection infrastructure for GRB alerts and well-commissioned ODC vector,
     - add a monitor channel after the ring buffer of the CAL-CS actuation chain
     - add infrastructure to use ITMs as DARM actuators into the DARM actuation calibration path
     - change the blind injection filter bank to be named "BLIND" instead of "BLND",
     - add infrastructure for eventually computing a optical gain correction coefficient in the corner station using PCAL lines* 
*see details in LHO aLOG 18671

E. Thrane, J. Kissel, C. Vorvick
Tested CW Hardware Injections; see LHO aLOGs 18681 and 18682.

Goals for tomorrow:
J. Kissel, K. Izumi
Finish processing the ALS DIFF and Free Swinging MICH assessments of the ETMY actuation strength, and update DARM model accordingly

J. Kissel
Process DARM OLG TF from LHO aLOG 18662, and compare against new DARM model

J. Kissel, K. Izumi
Update CAL-CS front end calibration to account for new Low Noise ESD driver strength and new L1, L2, L3 actuation scheme, and shift down the DARM coupled cavity pole frequency to our best measured of 355 [Hz] instead of 389 [Hz].

R. Savage, S. Karki, D. Tuyenbayev
Complete measurements of photodiode frequency response at both End Stations.

J. Kissel, R. Savage, K. Izumi, S. Karki, D. Tuyenbayev
Measure PCAL to DARM transfer functions for both end stations, begin to develop a model for the transfer function to inform sensing function scale coefficient, independent measure of cavity pole frequency, etc. etc.