During this shift we tested some DAS configurations to check the effect on the ITF.
More details on the different steps will follow tomorrow. The last test has been performed with P_in=125 mW and P_out=250 mW. This configuration seems close to the optimum working point.
We monitored the ITF behaviour with these DAS settings for about 3 hours. The ITF is stable, so we leave it locked with the DAS ON.
Here we report the details of the DAS actuation tests during the yesterday shift. The same power has been applied on both benches.
| Test | Start (UTC) | End (UTC) | Power IN (mW) | Power OUT (mW) |
| 1 | 16:04 | 16:06 | 200 | 400 |
| 2 | 16:24 | 16:40 | 100 | 200 |
| 3 | 16:45 | 17:33 | 150 | 300 |
| 4 | 17:33 | 17:52 | 175 | 350 |
| -- | 18:04* | 19:25* | 100* | 200* |
| 5 | 19:40 | -- | 125 | 250 |
*during this measurement the WI laser changed its working point, so the data are not reliable (grey area in the attached plot).
In the white areas the DAS was OFF.
The selected working point (test 5, probably close to the best one) allowed to keep the ITF locked for the all night.
