A first prototype of a Scanning Positron Microscope (SPM) with a pulsed beam has been developed in Munich. Besides of the positron beam also an electron beam is provided which produces a conventional electron image of the specimen. Currently we are setting the SPM in operation. A number of problems have been encountered in this process, particularly with the beam control, with various deflection systems and with instabilities due to fluctuating magnetic fields. The technical modifications to overcome these problems and the improvements achieved in this way will be reported.    «

A first prototype of a Scanning Positron Microscope (SPM) with a pulsed beam has been developed in Munich. Besides of the positron beam also an electron beam is provided which produces a conventional electron image of the specimen. Currently we are setting the SPM in operation. A number of problems have been encountered in this process, particularly with the beam control, with various deflection systems and with instabilities due to fluctuating magnetic fields. The technical modifications to ove...    »