High Brightness H- Ion Source for Accelerators Developed at TRIUMF

TRIUMF has developed H- ion sources for decades and now they are being employed in TRIUMF cyclotrons as well as in various other machines. A high current version can produce up to 60 mA W. A medium range source is optimized to produce 20 mA. A new smaller H- ion source with a plasma volume of 50 mm x 75 mm ion source is being developed to produce 5 mA at a very low emittance and mn years without changing the filament. Due to the low emittance and relatively little required maintenance, this ion source will suit cyclotrons as well as accelerators looking for reliable, stable operation with very low maintenance. Having four electrodes, this ion source can run at optimum extraction voltage while delivering the beam from 1 kV to 60 kV with little or no degradation of the beam quality. Performance of the source including beam current, arc parameters, emittance and filament lifetime arc discussed in this paper.