Fil, Thomas

Since it was Tuesday maintenance day, I thought it would be a good time to try to improve/fix the ITM optical levers:

- The sign conventions for positive and negative directions now fully match suspension bias sliders. This solves the negative sign difference in Keita's ALOG-10331 between the OpLev and his coordinate system.  I will plan on doing this for the ETMs as well, but with the new damping loops that are initiated on the lower stage, I'm going to talk to Stefan before making a change.

- Arnaud's ALOG-10426 pointed out that the noise floor at high frequency (above 100Hz) for ITMY was different from ITMX and ETMX by two orders of magnitude.  I let him know that the main difference in electronics is the whitening/anti-whitening chain not being activated for ITMY because we don't have enough binary daughter boards for all the optical levers on site (they are being ordered by Mohana).  Since we are in need of this optical lever to be in its final configuration, Fil created a jumper plug to recreate the daughter boards to activate two levels of whitening to make all test mass OptLevs match.

Figure 1 shows that improvement of the noise floor of ITMY so that it's even better than ITMX now.

Figure 2 shows that we did activate 2 levels of 1:10 whitening.