[en] Operational experience at TRIUMF has shown that an injected beam having a normalized emittance of 0.1 to 0.2π mm-mrad is better suited to reliable high intensity operation than the 0.32π mm-mrad specified in the original design. As a result, a study was initiated to determine the best source which would inject, within this reduced emittance, an H^- beam of 1 or 2 mA of intensity, corresponding to cyclotron extracted currents in excess of 500 μA. After comparing various sources, it was concluded that an Ehlers type PIG source is best suited for external injection into an H^- cyclotron where an intense, high brightness, reliable and full duty cycle source is important. The behaviour of the source as a function of various geometrical and arc parameters was investigated on a model test stand. Work is in progress to make the source conditions more reproducible and to increase its maintenance-free beam production time. The advantages of this source, the results of our experimental investigations and hints for a reliable behaviour will be reported