[Jenne, AmandaC]

With Sheila and Haocun's work earlier today (alog 28324) putting in the beam splitter on the POPAIR table, we are now able to see a dither drive in POP90.  We shake SRM in pitch at 4Hz with 100 counts, and see a clear peak in POP90.  See snapshot.  We haven't yet put this into a new ASC loop, but we will.