Figure 2
The displacement of the beam reflected by the collimating mirror as a function of the beam position on the mirror, top axis (or corresponding beam angular position, bottom axis), is shown in open circles. The solid line shows a linear fit to the experimental data and represents the beam position, reflected by the ideal mirror. The deviation of the measured mirror slope errors from a parabolic (ideal) mirror is shown in closed circles. A fit to this data by a model of an ideally smooth mirror with gravitational sag is given by the solid line. |