A# Profile optimization update for 01/28/2026 group meeting.

Slides updating progress on FROSTI A# irradiance profiles and reflector design. Edge roll-off is now included for thermoelastic deformation corrections.

Slides covering a new approach to optimizing for A# FROSTI profiles. In particular, we start looking at just optimal RH correction. Once this profile is determined, we then minimize the residual further with FROSTI profiles.

Vacuum Pressure Warning Script

Script Location: controls@chimay

Script Path: /vac/python/serial/temp_vacuum_warning.py

Purpose

Implement an automated warning system that monitors vacuum pressure and sends email alerts when pressure thresholds are exceeded.

Implementation Details

• The script runs launcher.py (located in the same directory) every 30 minutes to retrieve the latest vacuum pressure reading.
• If the pressure rises above the critical threshold (≥ 1 × 10^-6 Torr), an email alert will be sent to all group members.
• If the pressure rises above the warning threshold (≥ 1 × 10^-7 Torr), an email alert will be sent to Xuesi Ma.
• If launcher.py fails to retrieve the vacuum pressure, or if any execution error occurs, an error notification email will be sent to Xuesi Ma.

How to Run

python temp_vacuum_warning.py

Note

An app password is required for authentication in order to send alert emails.

The working document of tasks regarding moving the clean room is attached. Needs LIGO account to access and edit.

  https://docs.google.com/document/d/14HhMYBcHmM62Hc1YJhinMsG5uPx6xoW0WEBmDcbNMMg/edit?usp=sharing

[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.

[Cece, Ma, Mary, Pooyan, Tyler, Paul]

We have continued the reorganization of our Physics 1125 and 1129 lab spaces. This includes:

• Moving two workbenches from Room 1129 into Room 1125
• The workbench with the oven is still in Room 1129
• Assembling the stainless steel table
• Moving the cleanroom frame toward the whiteboard side to make room for HVAC work

The sink in Room 1125 was painted, and we stood Frosti up.

Cleaned off the tapes on the optical table with acetone.

DetChar meeting presentation

[Tyler, Ma]

We suspect a pressure gauge problem. The electronic unit of the main chamber pressure gauge and the electronic unit of the RGA chamber pressure gauge are swapped.

Power and current draw aren't high for the turbo pump.

Before opening the gate valve, the pressure in the Main chamber is 2.98e-8 Torr, RGA Chamber 1.21e-5 Torr

After opening the gate valve (not fully open), the pressure in the Main chamber is 2.97e-8 Torr, RGA Chamber 1.55e-9 Torr. Note: the HV sensor suddenly turned on and the reading jumped to -9 Torr

Opening the gate valve a bit more, the pressure in the Main chamber is 2.98e-8 Torr, RGA Chamber 1.34e-9 Torr.

After switching the electronic unit, the pressure in the Main chamber is 3.23e-8 Torr, RGA Chamber 1.43e-9 Torr.

Gate Valve fully opened at 16:01 Oct 24, 2025

Action items for facilities

• Ceiling lights replacement
• Fume hood cleaned and refurbished
• Sink countertop cleaning
• Floor cleaned and waxed
•  

Below are slides discussing RIN infrastructural updates related to the CyMAC.

Slides

Below are slides giving an update on RH O6 design progress.

These are the frequency averaged and veto binned plots for the initial Red Pitaya and CyMAC systems.