Morning dry air skid checks, water pump, kobelco, drying towers all nominal.

Dew point measurement at YBM , approx. -42C

Attached is the Trello showing what has been achieved this week and what is on the books for today.  Many things started yesterday were (expectedly) not finished in 1 day so will roll to today, namely finishing feedthru (and some cable) population in the empty HAM1 chamber, and evaluating ITMY and it's reaction chain for closeout given the new CPY slight pitch change. The ISI is ~en route from the staging building to the LVEA ~today in prep for install early next week.  Things seem to be on schedule with how I had them laid out in the plan, even after the Monday schedule loss due to the gnarly power outage and EE component failures which took the vent staff all day to recover from.

TITLE: 04/11 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 5mph Gusts, 3mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.22 μm/s
QUICK SUMMARY:

Left over tasks from yesterday:

• ONGOING   BSC8 - ITMY and R0 TFs after alignment complet
• ONGOING HAM1 ISC prep - check all removed cables for loose screws
• ONGOING HAM1 ISC prep - Inspect Optics and beam dumps, FC if needed
• ONGOING  HAM1 ISC - rework M12 and M15
• HAM1 ISC prep - Recheck all RMs with FRS ticket issues
• JASON - IAS HAM1 support tube ends?

On the docket for today is:

BSC8 - Prep for Closeout

BSC8 - DOOR ON

HAM1 - Prep for ISI install

VAC Start Feedthru Swap

Today's activities:

• HAM1 feedthrus were installed according to D1002872-v10.  D6 is completely populated.  D1 was populated with everything except the feedthrus on the 5-way cross.  Those will be added in the next days.  The 3-port adapter (currently on D4 but destined for D3) has completed 1 of 2 feedthru swaps.  
• CP1 RGA is being revisited.

WP 12451

The air RFPD cables were disconnected from the HAM1 feedthroughs (D6 and D5) and pulled back to ISC-R2. Cables were disconnected from the patch panels and removed from the rack. The air REFL WFS cables going to ISCT1 were removed, this included POPAIR_X. Daniel started installation of the new/modified patch panels in ISC-R2. The long RF cables will be re-terminated/labeled next week in the EE lab with female SMA connectors.

F. Clara, R. McCarthy, M. Pirello, D. Sigg

TITLE: 04/10 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

Most things from today are either done or partially done.

• DONE  HAM1 CRANE/FORKLIFT - SEI Stack removal, continued
• DONE  BSC1 (via BSC8) - CPY work - crew to map beams inside at spool, adjustment continued (Betsy, Robert, Sheila, Tony)
• ONGOING   BSC8 - ITMY and R0 TFs after alignment complet
• ONGOING HAM1 ISC prep - check all removed cables for loose screws
• ONGOING HAM1 ISC prep - Inspect Optics and beam dumps, FC if needed
• ONGOING  HAM1 ISC - rework M12 and M15
• HAM1 ISC prep - Recheck all RMs with FRS ticket issues
• JASON - IAS HAM1 support tube ends?

LOG:

Elenna, Camilla

We started to inspect the optics and beam dumps removed from HAM1 in 83836. They look dustier than expected, but after first contacting the optics are looking good, more to do...

• We replaced qty3 black glass beam dumps (BD4, BD10, BD12) that were slightly damaged with DLC coated SS plates D1800140 type 01 or 02. Alena suggested if we want to and have enough DLC coated plates, we could swap them all, there is still QTY 6 more glass ones. Black glass was placed in optics lab wiht other black glass.
• We inspected all the optics in Pan3 (M1, M2, M5, M14, M18, L1), they all had dust on them. M2 and M14 were the only two that had the middle ~1" of optic clean. Did not do any cleaning of this pan yet.
• Removed the optic from M15 (E1100048-v2 2.0-0990 HR 1064) and from M12 (E1000871-v1-02 AFT PL w04 95/5 BS), they will be moved back to the staging building optics storage. Removed the picos and beamdump from M15 and found a LH mount.  
• Chose new optics for M15 (E1000671-v1-02 “ATF PL W 057”) and from M12 (E40512-B3 IO820-05)
• We inspected the optics in pan 1 and pan 2 (googledoc linked from D1000313) all of them had some dust so we top-gunned them all. 
• We first-contacted (E1000079, E1300017) M11, M7, M17, and the future 90/10 for M12 with FC. M11, M7, M17 looked great so we reinstalled in their mounts, Left FC on the other side of M12.
• There is more to do. 

The In-Vacuum RFPD cables needed for HAM1 were re-terminated. Connectors that mate to the feedthrough are the new 5-way coaxial connectors. The connector that connects to the PD was not modified. Total of 11 cables were re-terminated. Cables were tested for continuity and a TDR test was performed using the Keysight FieldFox Analyzer.

D1300278 Qty 7 length 156”
D1300278 Qty 4 length 106”

F. Clara, C. Gray, M. Pirello

This morning I ran a full IPMI sensor scan on all the realtime front ends and h1susauxex could only see one of its two redundant power supplies. I drove out to EX to inspect and found that both PS look fine with green LEDs. One at a time, I disconnected the power cord and pulled the PS out of the chassis, waited until the LED extinguished and then reinserted. This has made no change to the IPMI Sensor reporting. I'll flag this unit as an exception when reporting failed power supplies.

IPMI Sensor h1susauxex:

h1susauxex:   OK     | (2215) Chassis Intru     |                  OK                   |
h1susauxex:   OK     | (2818) PS2 Status        |           Presence detected           |
 

IPMI Sensor h1susauxey for comparison:

h1susauxey:   OK     | (2215) Chassis Intru     |                  OK                   |
h1susauxey:   OK     | (2751) PS1 Status        |           Presence detected           |
h1susauxey:   OK     | (2818) PS2 Status        |           Presence detected           |
 

J. Kissel, O. Patane, I. Abouelfettouh, B. Weaver

Betsy asked Ibrahim to gather some health check transfer functions in air prior to their CP work yesterday. He'd struggled for a bit to drive standard templates on the reaction chain, and called in re-inforcements. We reminded each other that "R0 tracking," or "L2 to R0 damping", or "the L2DAMP path" exists that uses the PUM (L2) OSEMs in feed back to the reaction chain (R0) to keep the chains moving together (ECR E2000011, built into all QUAD front-end models Jan 10 2020 LHO:54416, installed the next Tuesday LHO:54506, quickly and obviously became useful on the ETMs LHO:54556, but only turned on for the ITMs for the first time on Nov 10 2022 LHO:65728). 

It is *not* a DC coupled loop, it's an AC-coupled "velocity damping" controller, but it does have a giant amount of gain with a resgain filter right at 3.3 Hz.

This tracking needs to be turned off during standard M0 or R0 "health check" transfer functions for *all* quads. They go unstable with huge (but standard health check) drive going to the main chain. We've run into having accidentally left these loops on for the ETMs before (LHO:60482), but this is the first time it's popped up for the ITMs, since it's the first time in a while we've characterized the ITMs.

Anyways, we found it, turned the ITMY L2 to R0 damping/tracking OFF (ITMX remains ON), and the main and reaction chain TFs that Ibrahim gathered went without a hitch after turning it off.
These TFs are 
    /ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMY/SAGM0/Data/
        2025-04-09_1330_H1SUSITMY_M0_Mono_WhiteNoise_V_0p02to50Hz.xml
        2025-04-09_1330_H1SUSITMY_M0_Mono_WhiteNoise_P_0p02to50Hz.xml
        2025-04-09_1330_H1SUSITMY_M0_Mono_WhiteNoise_Y_0p02to50Hz.xml

    /ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMY/SAGR0/Data/
        2025-04-09_1800_H1SUSITMY_R0_WhiteNoise_V_0p02to50Hz.xml
        2025-04-09_1800_H1SUSITMY_R0_WhiteNoise_P_0p02to50Hz.xml
        2025-04-09_1800_H1SUSITMY_R0_WhiteNoise_Y_0p02to50Hz.xml
Pressed for time, we did NOT take all DOFs.
Just wanted to get these TFs mentioned in the aLOG.

Randy, Mitch, TJ, Jennie, Corey, Jim

This morning we pulled the rest of the HAM1 PISI. This part was relatively trouble free, masses stuck to the viton corks a bit, so we put a bit of tension on the chain bridle then tugged on the mass till it popped free. Masses, springs and hardware were kept clean, the support table and risers were set out on the floor. I think vac is up next with feedthrus, the ISI still has to be swapped to a different container in staging.

Thu Apr 10 10:11:06 2025 INFO: Fill completed in 11min 3secs

Morning dry air skid checks, water pump, kobelco, drying towers all nominal.

Dew point measurement at YBM , approx. -44C

TL;DR - Don't worry about the new models and screens in /userapps/trunk/sus - Brian is developing these for the OSEM estimator project and none of these are (currently) linked to any observatory model.

--

FYI - As part of the project to see if we can improve the noise caused by the OSEMs, we are developing new models and medm screens for the HLTS. Tracking for this ECR is in FRS ticket 32526.  

We are running these at Stanford for testing, and putting them into userapps because we will be trying them on a triple at LHO soon (detail will be in a different log, they are still in flux a bit).

As such, I've created several new things in userapps. These are not linked to anything at either site - I'm putting this note here to reduce potential worry. These are still in development, so I suggest waiting a bit before you look at these.

New Files:

/userapps/trunk/sus/common/models/
HLTS_MASTER_W_EST.mdl   -  library part for M1 with the estimator calculation
SIXOSEM_T_STAGE_MASTER_W_EST.mdl - library part for upgraded HLTS model with the estimator included.

userapps/trunk/sus/common/medm/hxts/
SUS_CUST_HLTS_OVERVIEW_W_EST.adl - new overview screen with estimator

These files are copies of the existing parts as of March 2025, and I added _W_EST to the name of the copy.

userapps/trunk/sus/common/medm/estim/ - directory of new sub-screeens for the estimator

Updated files:

userapps/trunk/isi/common/models/
blend_switch_library.mdl - I added a new model to this library to allow smooth switching between the osem damping, the estimator damping, and OFF.

I'm running this from the new top-level model in

/userapps/trunk/isi/s1/s1suspr3.mdl