J. Kissel, H. Radkins, J. Warner, A. Pele Here's a recap of the the week's progress, contrasted against last week's to-do list; revising it for the next week or two. Arnaud's back to LLO tomorrow, Krishna's in for next week. Improve The Chamber Noise Performance: All Chambers Benefit to IFO - ST 01 L4C Feed Forward (all 6 DOFs), improve 1 to 10 [Hz] performance -- No progress yet DONE - Sensor correction gain matching (all 3 DOFs), improve 0.08 to 3 [Hz] performance (see LHO aLOG 16208) - Turned into "Investigate factor-of-2 problem with Corner Station STS B's X Channel" (see LHO aLOG 16237) - Assess whether switching to differential pressure affects platform noise performance -- suddenly interesting, may impact sub-0.1 [Hz] Yaw (see LHO aLOG 16231) - Measure HEPI Pump Servo Plant - Tune Pump Servo PID loop - Differential Pump Pressure signals are noisy possibly from poor electrical grounding, fix it if still there after loop tuning BSCs Only - Z to RZ subtraction, reduce BSC optic's yaw below 0.08 [Hz] This has turned into "Close RZ loops on Stage 1 and Stage 2 with high frequency blend filters" but seems to have little to no improvement. Continue Assessment. - Discuss / Assess closing the rest of ST2 isolation loops - Assess performance of loops with GS13s in low gain vs. high gain (are we ADC noise limited?) - Implement Slow MICH, reduce MICH velocity, improving lock acquisition -- No progress; waiting for Ryan DeRosa DONE - Finish ITM HEPI Z to RX/RY Tilt Decoupling, reduce BSC optic's yaw below 0.08 [Hz] (see LHO aLOG 16118) HAMs Only DONE - HAMs 2,3,4,5 Isolation Loop Gain Increase improve 0.5 [Hz] to 20 [Hz] performance (see LHO aLOG 16214) - Continue HAM3 0.6 [Hz] feature investigation improve 0.6 [Hz] performance No progress on *solving* the problem, but some investigation on finding a better compromise (see LHO aLOG 16196 Improve the Maintainability / Extensibility: - BSC-ISI Noise Budget Model -- Good Progress; see G1500081 - HAM-ISI Noise Budget Model -- No progress yet; sort of waiting for BSC-ISI budget to be more developed - HEPI Noise Budget Model -- No progress yet - Assess guardian vs. watchdog robustness of bringing all chambers to OFFLINE from FULLY_ISOLATED -- No progress - Put MATCH OUTPUT channels on Sensor Correction overview screen -- No progress DONE - Storing more than just RZ on HEPI alignment (see LHO aLOG 16207, LHO aLOG 16191) - Switch ETMX to using differential pressure signal - Include closing ST1 and ST2 RZ loops into guardian - Include gain switching on all Guardians - Get ISI system under SDF system configuration control DONE - Get HPI system under SDF system configuration control (see LHO aLOG 16217) DONE - Install DeRosa filters into NXT blend filter banks, such that blend switching may eventually work (see LHO aLOG 16200) - Figure out how to make blend switching code work with multi-bank filters Relegated to installation AFTER 2 hour lock: - Hook IOP SWWD signals up to ISI USER watchdog - Install HEPI saturable integrators - Remove HEPI / ST0 L4C Sensor Correction path from ISI models