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AdV-TCS (Wavefront sensing)

lumaca, nardecchia, menzione - 22:41 Monday 16 January 2023 (58436)

PR CHRoCC operation investigation with HWS INJ

The original shift on the DAS tuning has been replaced by an HWS-INJ measurement of the curvature induced by PR CHRoCC because of its strange behavior observed since yesterday (entry 58434).

After some tests performed on the hardware side (58438), the CHRoCC has been switched OFF at 17.30 UTC.

We waited ~4 hrs for the POP cooling down and, at 21.23 UTC, the HWS INJ acquisition started in WI single bounce configuration.

At 21.33 UTC, the PR CHRoCC has been switched ON by applying 0.7 V in order to have a direct comparison with the measurements performed in the past (56588).

The measurement will go on for the night.

Comments to this report:

nardecchia - 10:56 Tuesday 17 January 2023 (58441)

The data acquired during the night have been analyzed. An example of the wavefront map is shown in fig.1.

The measured curvature is in agreement with the one observed on 29 Jul 2022 reported in 56588 (see fig.2).

The temperature behaviours (heater and reflector) during the two different measurements are compared in fig. 3.

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