FRANKFURT EBIS DEVELOPMENT - FUNDAMENTAL RESEARCH AND NEW APPLICATIONS

Fundamental questions of electron beam ion sources (EBIS) are studied using three different setups. Cryogenic classical EBIS. The limit of i on-ion cooling in EBIS devices operating near the space-charge neutral ization limit has been studied experimentally. To investigate differen t degrees of compensation of the electron beam by highly charged ions, a hemispherical analyzer has been constructed including a novel decel eration optic for high resolution. Using its energy definition we test ed different modes of ion transportation in our multipassage magnetic spectrometer, which can be operated chromatically as well as extremely dispersively: up to 200 passages could be obtained. EBIS without magn etic field: First results on ion production in the short trap at the v ery dense crossover of an electron beam (XEBIS) confined only inertial ly without the use of magnetic fields are presented. Normal.conducting short EBIS: Using a normal conducting field of 0.8 T of 25-cm length an EBIS is under construction to study extremely short ion extraction of approximately 4 mus for single tum injection into a medical synchro tron for cancer therapy (MEDEBIS).