J. Kissel

Last Wednesday -- while initial alignment references were set to the "August" position (see on Aug 01; see LHO aLOG 50954) -- Sheila adjusted the alignment of the ALS DIFF beatnote beam on its diode on ISCT1 LHO aLOG 51280 because we thought that was one of the problems causing the last weeks locking problems (turns out it was BRSX glitching, see FRS Ticket 13417). She improved the beat note power on the diode from ~ -26 dBm to ~ -8 dBm.

Last Thursday (8/15), we adjusted the initial alignment offsets to reference a position centered on the test masses LHO aLOG 51307.

I wanted to confirm that in the new "centered," "acquisition" positions, the ALS DIFF beat note was still nice and high, and we didn't need to go back and revisit the ISCT beat note alignment. 
It is confirmed: Although it did change a bit for the worse, the power, on average, is stil about -9.5 dBm -- plenty high.

See attached ~1 week trend of the ALS DIFF beatnote power vs. the guardian state (to remind us that the ALS DIFF beatnote is only meaningful when ALS is in use during the lock acquisition sequence).