TJ, Fil, Camilla
We turned on CO2X laser without issues. TJ had to turn on Outputs of power supplies on the mezzanine. We searched for home of the rotation stage and checked that the beam was aligned to both irises before the periscope. Leaving laser on at minimum power. Guardian did successfully lock laser.
For CO2Y, we were unable to turn it on. We checked SMA connections on laser head, BNC and TNC connections between RF driver and laser and tried turning on in PWM mode with the PWM driver. Fil then swapped chassis D1700745 to a spare. This did not help. TJ then swapped the RF cables t the TCS-X rack for X and Y. X laser stayed working, Y laser still not working. Fil checked the AA chassis. Fil and TJ looked at swapping the power supplies at the mezzanine but this was complicated and the power supply appeared to be behaving normally.
This afternoon we swapped the chassis back. We then swapped the small square-wave RF box to the spare. And then swapped the RF driver briefly to the spare, this is not matched and we did attach cooling lines but had on for ~30seconds. Neither of these things helped so we swapped back to originals. We then noticed that the rocker switch was off on the D1300649 chassis inside the CO2Y enclosure. Turned this on and everything was fine.
CO2 Y laser turned on fine. We searched for home of the rotation stage with downstream beam dump and checked that the beam was aligned to the upstream iris before the periscope (we bumped the downstream iris while changing cooling lines). Leaving laser on at minimum power. Guardian did successfully lock laser.