(Alexa, Sheila)

We wanted to compare our senstitivty to angular motion between HIFOX and Y. I used Seigman (Lasers, Chap 19) equation for the beam displacement from the optical axis as a function of mirror displacements. In my calculation, I used the following values

• L = cavity length = 3994.472 (alog 9402)
• IMTX_ROC = 1939.52m     ETMX_ROC = 2241.54m
• TTMY_ROC = 2307m         ETMY_ROC = 2313m (from LIGO-T1300158)
• Assumed all mirror motion was .1urad.

I found the ratio of HIFO X to HIFOY for...

• motion of ETM resulting in displacement on ETM = 2.86
• motion of ETM resulting in displacement on ITM = 2.29
• motion of ITM resulting in displacement on ETM =1.97
• motion of ITM resulting in displacement on ITM = 2.46