Status Repotr on Physics Research and Technology Developments of Electron String Ion Sources of Multicharged Ions

Electron String Ion Source (ESIS) “Krion-2” (JINR) is the first and now only ion source of such type in the world. ESIS is a sophisticated modification of Electron Beam Ion Source (EBIS) working in a reflex mode of operation under very specific conditions. Using the results of the research and the technology development the following main results were achieved in JINR with Krion-2 ESIS during recent years: Au ion beams with intensity 5x10 particle per pulse were first produced and ion-ion cooling technology was demonstrated to prove its efficiency for a thermal ion loss reduction; Krion-2 was used for production and injection of Xe ion beam into LINAC injector of JINR synchrotron Nuclotron, where the beam was first accelerated to relativistic energy in March 2010 [1-3]. At the present time an essential progress was achieved in construction of the new 6 Tesla ESIS, which is expected to be the full scale prototype of a highly charged ion source for NICA the new JINR accelerator complex. It is foreseen in the NICA project that new ESIS will provide Au beams with the ion yield about 2x10 ppp. However, a project parameters of new Krion-6T(esla) ion source allow to expect production of even more highly charged states of heavy elements, up to Au in terms of gold. In this case the new Krion-6T ESIS may be used on operating JINR “Nuclotron” facility in near future for experiments with an extracted accelerated gold ion beams on a fixed target.