List of devices of this kind

Checking camera housing pressure and pumping it out

• The software pressure measurement, found in the LGSW lab gui WFS camera tab, gives a first order estimate.
• Switch on the gauge (on 'auto off') mounted on the pnCCD camera and read the pressure.
• if the pressure is close to the software limit (~50mbar), you will need to pump.

• Prerequisite: the WFS camera is in state 'StartedUp' (the Peltier controller should be off, and the CCD temperature should be >0C).
• Look for the pump (ArgosCabinet0). You need the pump, the power cord, a long extension cord (most likely available at level 5) and the vacuum fittings that are stored in a small carton box with the pump.
• Place the pump as close as possible to the pnCCD valve, the small platform behind the ARGOS WFS rack is a good location.
• Connect the power and the vacuum tube from the pump to the pnCCD (make sure the connections are tight).
• Start the pump and wait a few seconds (to have vacuum in the tube).
• Open gently the camera vacuum valve and monitor in parallel the pressure (if the pressure were to rise, close the valve as fast as possible).
• Once fully open, let the pump run for a couple of minutes to ensure an effective pressure <1mbar.
• Gently close the valve.
• Monitor the gauge pressure making sure it converges.
• Stop the pump, disconnect all, and place the pump back in the proper storage (in ArgosCabinet0).
• Don't forget to fill the respective twiki page of the respective camera: WfsCamera1 (SX) or WfsCamera2 (DX).