50keV, 50mA Pulsed Proton Injector for PEFP

Duoplasmatron type ion source with 50keV proton beam has been constructed and stably operated as the injector for Proton Engineering Frontier Project(PEFP). In DC operation, the beam current of 50mA with 50kV extraction voltage is routinely obtained. PEFP linac is aimed to pulsed proton beam by pulsed extraction tools from hydrogen plasma. A high voltage pulse switch is connected between accelerating electrode and ground electrode for this purpose. Consideration on the focusing of the pulsed proton beam with space charge compensation is in progress. Beam profile in front of RFQ is measured by optical measuring tools.