Date: April 29th, 2004
Attendees: Tiffany Findley, Sany Yoshida (LLO) Matt(Pennsylvania), Hiro, Biplab (Caltech)
"E2e simulation of Input Optics"
By Tiffany Findley
We made the LOS (Large Optic Suspension) and SOS (Small Optic Suspension) boxes more accurate by using realistic suspension point motion and calibrated OSEM gain settings. Using these boxes, we tested the effect of asymmetrical OSEM gain settings on the optic's motion. When we gave random asymmetry of 1% to the four rear SOS OSEM's, the pitch/yaw peak value at the table resonance increased about 10%. Then we used the LOS and SOS boxes to create a preliminary simulation of the Input Optics, including the Steering Mirror and the MMT (Mode Matching Telescope) chain, to investigate the optical coupling into higher order modes due to the optics' motion and the optical coupling into the arm cavity. When we gave the same realistic table top motion to the SM and MMT's the optical coupling after the MMT3 was approximately as high as 0.05%.
Any comments? write to bbhawal@ligo.caltech.edu