Parabolic trough, change in focal length due to cosine effect

Hello Paul,

we have a question and hope that you can help us.

With calculating a parabolic trough field,
does SAM account for the change in focal length due to
the cosine effect?
This leads to a broadening of the beam and should
get worse with thinner absorber tubes.

Kind regards,
Joe

Hello Paul,

I think there was an error in error in reasoning...

Parabolic trough basics :)

We thought about the issue and there is no real change
of the focal length in the parabola plane.

Kind regards,
Joe