Damping Stronger

With the help of the SUS folks, I increased by a factor of 3 the gain on the quad yaw and vertical (both M0 and R0 on ITMY and ETMY).  I also added 0.45Hz boosts to L and T for the transmon damping.  All of these changes are aimed at making sure that the ISI does not see sharp resonant features from the suspensions.

HEPI Tripped, cavity misaligned

I started the evening with the PLL unlocked, and the cavity badly aligned.  The cavity alignment problem came from the HEPI, which had tripped and thus let go of its 1M count RZ offset.  It turns out to be surprising difficult to restart HEPI without the watchdog tripping;

1. remove the RZ offset (set gain to zero)
2. open all filter inputs
3. clear all filters
4. set output gain to 0.05
5. close all filter inputs
6. slowly ramp output to 1
7. set 60s TRAMP on RZ offset
8. restore RZ offset (set gain to 100)

Or maybe we should just consider making the WD less sensitive.

Slow Controls Don't BURT, CM settings wrong (again)

The PLL was not working because the CM board was not set properly.  The compensation filter was off, and the boost was 1.  I guess these should be {on, 0}, or at least it works like this.  Similarly the PDH CM board had the common option on, which made it not work either.  We should really find a better solution.

Locking Well, small power fluctuations

After fixing these problems, and tweaking the alignment with the ITM and ETM, the cavity locked and was very stable.  We should check the state of the ISIs during this time.