[Audrey, Cece, Jon, Ma, Mary, Michael, Pooyan, Tyler, Shane]

We have completed the preliminary reorganization of our Physics 1119 lab space. This includes:

• Moving all cabinets to their final positions
• Clearing out all equipment from the cleanroom in prep for HVAC work, and storing them in either the HEPA cabinet or double-bagging in regular storage.
• Moving all non-essential equipment into other lab spaces.
• Wrapping vacuum system and VLC for protection
• Removing all ceiling tiles and fans from the ceiling of the cleanroom
• Moving the cleanroom frame towards the front of the room.

Prepping the new clean-and-bake station in 1125 will begin within the next week, along with the construction of the stainless steel table planned to be put into the cleanroom.

Today I fixed the final bit related to the nitrogen gas tank, which is to apply sealing tape to M-NPT connector of the hose to prevent leakage (file: AirGunSealed.jpg)
After application of the tape, no audible leak can be heard from connection between the hose and the air gun.

The general operating procedure for the gas tank is as following:

1. Turn the regulator (blue handle) anti-clockwise still it's loose
2. Turn the valve on nitrogen as tank anti-clockwise, immediately the RHS meter of the regulator would jump to approx 2000 psi. This is the standard pressure for high pressure gas tank
3. Turn the regulator clock-wise slowly until the pressure one the LHS meter face reads approx 60 psi. This is sufficient for drying parts with. At this point, the flow pressure still should register zero
4. Press the trigger on the air gun, a high pressure air flow should come out and the flow meter should increase
5. When finished, close the gas tank valve, turn the regulator anti-clockwise, then press the air gun trigger to release gas left in the hose/gun

• Looked at the mode mismatch using cavity_mismatch_table().
• Compared these finesse_ligo factory model mismatch values with those of the aLIGO katscript model.
• The latter does not have the cavity_mismatch_table(), looked at both models' mismatch values using cavity_mismatch().
• Ascertained that there is less mode mismatch in the katscript model (~10^-2) as compared to the factory model (~10^-6).
• Mismatch values are starkly different, not just for (PRC, XARM) but also for others like (OMC, XARM).

• Analysed the locking process for factory model and katscript model to find minor differences in the order.
• Tried applying the katscript locking function to the factory model and still seem to get the same results. (to recheck)

- the non-uniformity brought by annealing for ETM14 and 11 seems to be higher than expected, this meeting focused on discussing about annealing data for ETM014 and 11 : https://dcc-lho.ligo.org/LIGO-T2600213

    -we will receive more data for these, since there are some residual power left in the data/plots shown in the meeting because of the reference sphere, and the exact reference sphere radius is unclear

- reviewed the uniformity plot for HR ETM with TiGe coating again: https://dcc-lho.ligo.org/LIGO-T2600277

- not a lot of updates for ring heater: 40W delivered. Currently lock with 1.5W per segment on ETMy at LHO

- slides for HOM study for 250mW biased profile:

https://docs.google.com/presentation/d/1BWh_skxkCXBu_e_QkXkUs9CdvFIryu7H_jfpCgOenNg/edit?usp=sharing
https://docs.google.com/presentation/d/174XVLLpNpNgnL0uV-dSp6MO5pmZ9Yvnouf8V0LA2zE8/edit?usp=sharing

However, we did not focus on any surface profile related topics in the meeting so it was not presented

- using the change in surface from annealing, Hiro did some study on HOM scattering/losses from just this surface (shown in the email attachmnent O5testmass.pdf. We together went over these results again.

    - ETM11 annealing data to be used: https://dcc.ligo.org/T2600214
- more annealing data: https://docs.google.com/spreadsheets/d/1E138nNZk5b1yPm0g5jmwv_Z9FD9ArQtnlAk1d_1Ce1U/edit?usp=sharing

- Mostly discussed what to do about this annealing surface change when we are polishing the mirror: The idea now is to polish around it (the polish will include the negative of those surface deformation), but it's better to express it in an analytical form to the manufactuer. We try to explore if it is feasible to represent this surface introduced by annealing as Zernike coefficients

- New ITM meausrement shown as attachment below

- Kevin and Evan will take this surface after annealing as part of their error analysis for their 250mW biased surface profile in the furture, meanwhile I tried to see how will the HOM and PRG conditions change if we don't do anything about this surface, using same analysis we did before:

-
https://docs.google.com/presentation/d/1nkyOmivyaPKkvbgf3TPBjgV2YcgRum7N1EvapgcIMaA/edit?slide=id.p#slide=id.p

[Tyler, Ma, Christina, Luke]

We threaded the wiring of the heater elements through the reflective surfaces and were able to attach each piece with the Macor spacers and connect both sides. We used the guide rails and screws to ensure proper alignment. The only necessary step left is to add the additional external screws for the reconstruction.

[Ma, Tyler, Christina]

Finished external reconstruction of the FROSTI by installing all the pins to the 2 DB 25 connectors. To ensure everything was operating correctly, we did electrical testing by testing continuity and by checking each of the heater elements' RTD and power resistance values and comparing them to what was tabulated in January. Additionally, we organized the wires and added the stands.

Below are the drawings for the pomona box modifications

[Christina, Ma, Tyler]

Pomona Box completed and is now on the server rack in 1119. Additionally, the photodetectors were connected to the box and set up in front of the heater elements.

[Christina, Ma, Tyler]

Yesterday, Ma and I started taking data for the PSD/CSD measurements while the photodetectors and one of the heater elements are on (8) and are using the Red Pitaya to compare it to the data we took for the same measurements on the CyMAC. It will be finished Wednesday morning, and then we plan on starting to take additional recordings in order to conduct the same type of comparison for the dark noise measurements.

[Ma, Christina, Tyler]

Figure 1 shows the following PSDs for channels 0-15 from the 14 hour test. Figure 2 shows the reduced chi squared and CSD plots for both the 2 Hz and 16 Hz resolutions.

[Ma, Christina, Tyler]

ADC CyMAC 260 hr, 8192Hz sampling rate channels V3 and Vref6