Performance testing of electrostatically focused uv-visible image converters with deflection capability.

Two prototype uv to visible image converter tubes with image deflection capability, produced by the En- glish Electric Valve Company, Ltd., have been tested with respect to performance parameters related to the photometric and imaging properties of the tubes. The two converters were electrostatically focused with a triode structure and were magnetically deflectable. The tests were executed at a facility for abso- lute intensity calibrations in the visible and vacuum uv spectral region available at the Max-Planck-Institut für Extraterrestrische Physik. Test procedures and results are reported.