Tuesday, April 27th was an exercise in chaos.
It started when we arrived at the morning rendezvous and noted the number of vehicles waiting. Transportation sets up up as many vehicles as necessary based on the ride board, usually two or three vehicles are sitting by the door waiting to transport our crew to the summit. That morning there were five, and we all knew from the schedule that many more would be leaving later in the day. This was going to be a busy and crowded day.
At Hale Pohaku we were met by a film crew. Documentary film crews are an occupational hazard at Keck. I have appeared in more than one show. Not usually a problem, this day the crew would be yet one more complication.
For myself, things started to go bad with an email message, trouble with a key piece of equipment in AO. At the heart of the adaptive optics system is a thin flexible mirror that can change shape to correct the light, the DM or deformable mirror. In order to monitor this mirror a WYKO interferometer is used to image its surface. This device shines laser light at the mirror, the return light is interfered with itself, allowing the surface shape to be analyzed with incredible accuracy. This is used to calibrate the AO system at the beginning of each night. Gone was my plan of a simple day doing some documentation checks to prepare for some upcoming modifications to the system.