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AdV-DAQ (Calibration)
estevez, eisenmann, verkindt - 10:20 Friday 13 July 2018 (42114) Print this report
PCAL installation

From Wednesday 11th of July around 13:30 UTC to Friday 13th of July 10:00 UTC, PCal on WE and NE have been installed.

The set-up on WE have been fully re-installed since we had dismounted it to make various tests at LAPP. A new metal plate more robust has been added to the set-up in order to prealign the collimator with the beamsplitter polarizing cube and the new mirror (BSX11) for the injection.

Another mirror BSX11 on the injection bench has been set in order to reduce the power incoming on the photodiode.

On NE, the set-up was already installed but we made a few changes. The metal plate has been replaced also and we added the beamsplitter polarizing cube and two BSX11 mirrors as on WE. The set-up has also been realigned.

Attached, pictures of the optical benches for both PCals and the image of the WE and NE cam where the spot of the laser can be seen plus a bigger spot likely coming from diffused light in the tower.

Pre-measurements of calibration for the lasers and the photodiodes has been made with a thermopile powermeter. The measurements were done both on the injection and on the reflection benches on WE and NE and will soon be analysed.

Further measurements for the calibration of the PCals will be made in the next months with a new integrating sphere from Newport much less sensitive on the orientation of the input port with respect to the laser beam and a better accuracy on the measurement of the power.

Images attached to this report
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