PACS grating and chopping initial functional tests completed
The commissioning of the chopper and grating (tuning of control parameters) has been completed today with an achieved performance equal or better than what was reached on ground.
The chopper behaviour was found to be identical to what was experienced during the ground tests, giving confidence that the chosen control parameters are robust against variations in the operational temperature of the chopper.
The very good stability of the grating was also confirmed with several sets of parameters.
As of today, the manual commanding of the PACS mechanics is finalised and the two mechanisms can be declared commissioned.[B. Altieri & R. Vavrek, posted 5 June 2009]