Production of U beam from RIKEN 18 GHz electron cyclotron resonance ion source

For the RIKEN radio isotope factory (RIBF) project, we produced the multicharged uranium beam with two methods. To produce lower charge state U ion beams (14(+)-20(+)) we used the UF6 gas as an ionized gas. The typical beam intensity of U14+-20+ was 2-1 particle mu A at the extraction voltage of 14 kV. To produce higher charge state U ion beam (U35+), we chose the sputtering method. The beam intensity was 70 particle nA at the extraction voltage of 5.4 kV. Using this method, we successfully produced multicharged U beam continuously for one month without break for RIBF commissioning. (C) 2008 American Institute of Physics.