Craig, Robert, Cao, Dan

We came in today to pull off all the data we had on the phase camera as it'd been switched off yesterday. Everything but the CMOS camera on ISCT1 was switched off. When logging in to the computer controlling the connection to the camera to get the data, the service restarts the camera connection which toggled the internal fan. When the connection opened I just happened to notice that the scattering appeared in DARM. This was happening ~2700s looking back through the POPX DC channels. We had told the camera to always keep the fan off, however it seems to have a feature that will forcibly turn it on if the sensor gets hot to stop any damage from ocurring. Running the camera for multiple days outside of ISCT1 we had never noticed it turning on, but the tables having no substantial air flow get warm enough for it to trigger it.

Dropping out of observe we checked it was the camera by stopping the PRC2 feedback and switching on the camera fan, we saw nothing. Robert wanted to see if it was the turbulence or the vibrations itself. We went out and blocked the fan vents and switched the fan on and off (1256770963 for 60s). The block removed all the DARM scattering shelves we were seeing so it was indeed the turbulence. The CMOS camera is now unplugged.