Abstract
The ion optical properties of the Munich Q3D-spectrograph were investigated using a special experimental ray tracing method. Cs +-ions produced in a thermal ion source were accelerated by means of a very stable dc-voltage and focused on the object point of the spectrograph (spot size 0.2 × 2 mm 2). From this ion beam a set of rays corresponding to those used in ray tracing calculations was obtained by a special collimator system. The positions of these rays were measured in the region of the focal plane with an accuracy of about 0.15 mm. From these measurements we have been able to determine the ion optical properties of the spectrograph including aberration coefficients up to 4th order. The results are compared to ray tracing calculations for the spectrograph. Within the accuracy of both the ray tracing calculations (due to uncertainties in field boundaries), and the measurements reasonable agreement is found.
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