After working some more on the EY table, we are getting some TEM00 flashes for the Y arm green. We have had to raise the height of one of the MM lenses to prevent clipping.
We used a function generator to apply a ~300 mV 10 Hz triangle wave to scan the laser frequency while aligning.
We tried to use the C1:ALS-TRY_OUT channel to help us in our alignment but there are a couple problems:
1) It seems that there is an uncompensated whitening filter before the ADC - Annalisa is making a compensation filter now.
2) The data delay is too much to use this for fast alignment. We might need to get a coax cable down there or mount a wired ethernet computer on the wall.
3) We need to make DQ channels for the TRY and TRX OUT. We need long term data of these, not just test points.
I made the anti-whitening filter for the C1:ALS-TRY_OUT channel. But then I forgot to make an ELOG because I am bad.