jeffrey.bartlett@LIGO.ORG - posted 06:49, Thursday 27 October 2016 - last comment - 23:24, Saturday 29 October 2016(30920)
TCS Laser Noise
Kiwamu saked the ops to run some TCS laser noise measurements.
SETUP:
- After IFO is locked at NLN for at least 30 minutes
- Open TCS_MASTER screen
- Open the CO2 X & Y screens
- Open the POWER CONTROLS screens for X & Y
- increase the power by 0.1W
- Wait 90 minutes, and increase the power by another 0.1W
- Repeat until at about 2W
- aLOG the times and power levels
Started the run:
TSC X - Initial Power = 0.2W TSC Y - Initial Power = 0.0W
| Time | Power | Time | Power | |
| 03:00 | 0.3W | 03:00 | 0.1W | |
| 04:30 | 0.4W | 04:30 | 0.2W | |
At 05:08 Lost lock due to a Mag5.8 EQ in Alaska.
I only managed to get one more data point for both arms:
15:30 utc: TCSx at 0.5W for 90 minutes.
TCSy at 0.3W for 90 minutes.
Oct 28, 10:03UTC, TCSX power set to 0.6, TCSY power set to .4
oct 28, 11:32UTC, change X from 0.6 to 0.7, changed y from 0.3 to 0.4
oct 28, 13:27UTC, tcsx raised to 0.8, tcsy raised to 0.5
As range dropped and arm signals got more noisy I feared H1 was about to lose lock, and touched up TMSX and TMSY alignment. Hopefully this didn't invalidate the data for TCS analysis.
Tweaks by TMS:
Tweaks and TCS changes by timeline:
15:05 UTC: TCSx at 0.9W for 45 min.
TCSy at 0.6W for 45 min.
At 4:43 UTC today (10/30, or (10/29 still PST)), after Robert left, I changed TCSY to .2W, per Cheryl's suggestion left with Corey. TCSX is still at .4W.