This rim angle corresponds to a focal length of the parabola of
5.04 m because the rim angle of 45 provides for a smaller solar image
in the focal plane, and then, the highest geometric concentration
is obtained (Fig. 6).
Continuing the sequence design, a calculation is performed to
determine the location of the absorber by calculating the length
of the cavity Eq. (26) and the spacing of the absorber (Sp) with respect
to the focal point Eq. (27), as observed in Fig. 2. The radiation
is distributed best on the absorber surface with a cavity length of
5.72 cm and a spacing of 20.86 cm to comply with this condition,
because the projection cone image is taken after the focal point.