Experimental studies were conducted to characterize and improve the performance of the flat-B ECR ion source.The emittance of the source was investigated for the first time.The output beam currents of high-charge-states of Ar (q>8) were nearly doubled by increasing the plasma electrode aperture from 4mm to 6mm in diameter.To investigate possible enhancements with broadband microwave radiation,a "white"Gaussian noise generator was employed with a TWT amplifier to generate microwave radiation with a bandwidth of～200MHz. The performance of the fiat-B ECR ion source was found to be much better with narrow bandwidth radiation when the source was operated in the fiat-B region.However.the ion beam intensities and charge state distributions were improved with the broadband radiation when the source was tuned off the flat-B region.
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