Marc Nutsinee Daniel

Servo board readbacks:

All common mode boards in the squeezer rack (CLF S/N S1700344; OPO S/N S1700345; SHG S/N S1700346; LO S/N S1700348) as well as the 2 spares (S/N S1700347 & S/N S1700349) were modified according to E1900103 (high pass filtering of DAQ channels to avoid slew rate limitations in the AA chassis).

AM modulated RF amplifier:

Installed the AM modulated AOM driver chassis D1900045 (S/N S1900202) and removed the temporary ifr RF synthesizer and Mini-Circuits RF amplifier.

Squeezer model:

Updated the model to add a dedicated integrator at the output of the green pump power stabilization. This prevents the filter output from increasing to very large numbers, when the actuator is out of range. The servo can now be turned on and off with a trigger from the OPO transmitted power.

The bad:

When we tried to relock the squeezer, we had to fix several problems with broken equipment!? Cause unknown.

1. The SHG wouldn't lock because the I channel of the IQ demodulator chassis was not working (replace with spare S1000780).
2. The CLF wouldn't lock because both channels of IQ demodulator chassis were not working (replaced with spare S/N S1000774).
3. The excitation channel for the CLF is not working and both differential legs are railed. Since there is no powered equipment for this in the squeezer rack, this must be caused upstream (cable, AI chassis or DAC).
4. The PZT driver for the SHG has a ~40V offset. This is not good, since it limits the range of the actuator. However, we could lock the SHG at ~80V and left it at that.