Reports until 12:35, Tuesday 15 November 2016
H1 IOO (IOO)
cheryl.vorvick@LIGO.ORG - posted 12:35, Tuesday 15 November 2016 (31494)
REFL DC incident power and output voltage at 22W, 31W, and 50W

Today I looked at the output voltage from REFLduring H1 locks at 22W, 31W, and 50W input power, and calulated how the output voltage increased with input power to H1.

22W 31W 50W

27mW incident power

(measured)

 

61mW incident power

(calculated from 22W

power budget)

0.3V output voltage 0.7V output voltage 1.0V output voltage

In the above chart the incident power at 50W is calculated from the measured 22W power budget numbers.

I used the 22W incident power to get a conversion from mW to counts on REFL_DC_INMON, and used that conversion to calculate the incident power at 31W and 50W.

input power REFL DC incident power mW/count incident power
Watts counts measured, mW measured calculated, mW
22 520 27 0.05192  
31 1137     59
50 1586     82

At 50W input power REFL sees 82mW incident power.

Above is incorrect (unlocked numbers, not locked).

Numbers below are calculated, based on unlocked transmition through the HWP and CWP in the IMC MCR path.

input power REFL DC incident power mW/count incident power
measured, Watts measured, counts calculated, uW   calculated, uW
22 520 8 0.0154  
31 1137     17
50 1586     24