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Reports until 10:51, Thursday 07 August 2014
H1 IOO (PSL)
sheila.dwyer@LIGO.ORG - posted 10:51, Thursday 07 August 2014 (13265)
PSL power calibration

Alexa, Sheila

We went into the PSL to understand the calibration of the power into the chamber.  The first step was to remove temporary half wave plate  alog 12710.this changed the splitting ratio for the monitor PD, causing our monitor to not be accurate. .We also updated the calibration of the rotation stage, the max power we set to 20.7 Watts based on a measurement with the water cooled power meter head before the rotation stage; we found that the minimum power was 17 mW at an angle of -24 degrees so we also updated those values.

As a check we requested 1 Watt from the rotation stage, we measured 1.12Watts, and our monitor readback report 1.15 Watts.  We have left this setting, the light pipe shutter is closed.

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