This morning, a new measurement has been performed with HWS-INJ to verify the position of the WI DAS OUT in the configuration with the new laser with respect to the old one (see entry 64763).
All the actions are listed below:
- 07.09 UTC: manual unlock.
- 08.45 UTC: ITF in WI Single Bounce. In this configuration we checked the HWS-INJ illumination (see Fig. 1).
- 08.49 UTC: HWS-INJ acquisition started (Folder 20240801T1049).
- 09.06 UTC: the waveplate has been rotated to set the power of the WI DAS OUT up to about 4 W impinging on the CP (after WF 17).
- 10.36 UTC: HWS-INJ measurement interrupted (WF 103).
At this point, we also checked the position of the WI CH.
All the actions are listed below:
- 10.37 UTC: manual unlock.
- 10.48 UTC: ITF locked on arms IR.
- 10.56 UTC: ITF in WI Single Bounce. We again checked the HWS-INJ illumination (see Fig. 2).
- 10.57 UTC: start HWS-INJ measurement (folder: 20240801T1257)
- 11.05 UTC: the waveplate has been rotated to increase the power of the WI CH up to about 200 mW impinging on the CP (after WF 8).
- 12.20 UTC: HWS-INJ measurement stopped (WF 80).
- 12.30 UTC: we restored the WI CO2 actuators powers and we also checked the NI CO2 actuators powers.
Two examples HWS-INJ maps extracted from the two different measurements (today and monday 22nd July for the DAS and today and friday 19th July 64752) are shown in Fig. 3.
The measurements confirm what has been observed in the measurement done with the thermal camera (see entry 64818), namely the horizontal misalignment of the WI DAS OUT with the new laser with respect to both the WI CH and the WI DAS OUT with the old laser. The misalignment has been estimated to be about 2.5 cm.