[Alastair, Aidan]

Attached are some plots of RIN for the X and Y arm lasers.  There are now channels in the front end for RIN for in loop and out of loop photodiodes on each table.  Here we show the RIN and dark noise for both lasers.  The in loop photodiode for the Y-arm table is giving zero response so either there is a problem with it or the beam is mis-aligned.  I've only attached the data for the other 3 diodes.

The dark noise is consitent between all three diodes.  The RIN of the X-arm laser is approx 5x10^-7 at 20Hz.  The Y-arm laser is higher at 2x10^-7.  The Y-arm result is similar to the best we measured at Caltech (also attached).  It may be that the X arm is lower than we have previously measured due to the low noise enviroment.  The spectrums show no excess at low frequency such as would be attributed to air motion on the table, which is good news.  Also the in loop and out of loop diodes on the X-table show very similar spectrums which is good for any future intensity noise cancellation.