daniel.vander-hyde@LIGO.ORG - posted 21:58, Wednesday 17 October 2018 - last comment - 21:07, Thursday 18 October 2018(44634)
TCS change from 10-15-2018 to 10-17-2018
It might be useful to summarize the TCS changes made from Monday to today:
10-15-2017
| CO2X | CO2Y | PRG | RF18 | |
| IFO COLD (2W) | 0.5 W | 0.66 W | 49.5 | 94 |
| IFO HOT (20 W) | 0.11 W | 0.09 W | 47.5 | 52.5 |
ITMX RH @ 0 W
ITMY RH @ 1.04 W
Please see first figure for relevant time series of a 20 W lock stretch
10-17-2017
| CO2X | CO2Y | PRG | RF18 | |
| IFO COLD (2W) | 0.5 W | 0.6 W | 48 | 83.5 |
| IFO HOT (20 W) | 0.1 W | 0 W | 47 | 56 |
ITMX RH @ 0 W
ITMY RH @ 1.74 W
Please see second figure for relevant time series of a 20 W lock stretch
OSA scans
The following two tables list the carrier and sideband power when at 20W:
| 10-15-2018 | 10-17-2018 | |
| carrier (counts) | 826 | 856 |
| 9 MHz upper (counts) | 1252 | 777 |
| 9 MHz lower (counts) | 589 | 617 |
| 45 MHz upper (counts) | 1800 | 1828 |
| 45 MHz lower (counts) | 2366 | 2158 |
The new TCS settings seems to have improved the balance between the 9 MHz sidebands, and RF18 when at 20 watts.
TCS to do list:
- Improve the noise on ITMX HWS (in progress)
- Common lens adjustments
Images attached to this report
Comments related to this report
CO2X is now at .2 watts when PSL input is at 2W. This was done because on Tuesday we tried to increase CO2Y to compensate for the ring heater change but it just made locking difficult.