Reports until 17:38, Wednesday 16 August 2017
H1 AOS
sheila.dwyer@LIGO.ORG - posted 17:38, Wednesday 16 August 2017 (38233)
ETMX charge measurement

I have been starting to make some ESD actuation measurements while other measurements are ongoing.  The idea is to measure 4 parameters in EQ 2 of G1600699 by putting an excitation onto the bias electrode with and without a bias, and onto the signal electrodes with and without a DC offset sent to the signal electrodes. 

Jeff K kindly let me inject some lines during his calibration measurements today, and here are the results I get.  I might have gotten some signs wrong, that needs to be double checked.  These measurements could be scripted, and should not take more than 15 minutes per optic.  

alpha -2.7e-10 N/V^2
beta -3.3e-9 N/V
beta2 -7e-9 N/V
gamma 8.45e-11N/V^2
Veff=(beta-beta2)/(2(alpha-gamma)) -5.2 V
Non-image files attached to this report