New developments in multicusp H(-) ion sources for high energy accelerators.
A functional description of multicusp H(-) sources is given, focusing on the fundamental elements of this source type: the discharge chamber, the extraction plasma region, and electron dumping. Design choices for these elements will be presented and compared. The options of rf and filament heating of the discharge chamber will be presented. Also, the construction opportunities in the extraction plasma region using filter field arrangements and collars are described. Three methods to dump the electrons at three different regions are discussed. In a brief history, the development of multicusp sources are described. The status of the new sources under development at DESY, SNS, and in Japan will be given in a table for all types of operational H(-) sources. Finally, the limits to the H(-) current and emittance as well as the Cs question will be discussed.
Peters
J
J
Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, Hamburg, Germany.