Range comparison plot:
Command Ran: python3 range_compare.py 1396833438 1434842418 --span 1800
time 1 is April 11th 2024
time 2 is today at 23:20 UTC June 24th 2025
I ran two brucos, one on NOLINES and one on CLEAN.
Overall, the message of Tony's alog is that, relative to our best range, we have lost 10 Mpc by the time we reach 100 Hz, and an additional 5 Mpc by the time we reach 1 kHz. The brucos above show a lot of low level coherence with: MICH, SRCL, PRCL, REFL RIN. There is a chance that making additional improvements to the feedforward can help. Right now it's hard to tell how many Mpc that gets us back, but it's where we should start.
I made a range comparison with a time form last night when we got up to 155Mpc (Jun 25, 2025 05:07:30 UTC (1434863268)) and compared it to a time of good range before the vent, Apr 01, 2025 03:05:42 UTC (1427511960). Here's the range comparison.
This is interesting because it indicates that the range loss at low frequency in DARM now versus right before the vent is much smaller, only 3 Mpc. But looking back to our best range in April 2024, there is even more loss in sensitivity at low frequency.