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A comparison of the two most prominent electron sources of high averagecurrent high brightness electron beams, DC and superconducting RF photoemissionguns, is carried out using a large-scale multivariate genetic optimizerinterfaced with space charge simulation codes. The gun geometry for each caseis varied concurrently with laser pulse shape and parameters of the downstreambeamline elements of the photoinjector to obtain minimum emittance as afunction of bunch charge. Realistic constraints are imposed on maximum fieldvalues for the two gun types. The SRF and DC gun emittances and beam envelopesare compared for various values of photocathode thermal emittance. Theperformance of the two systems is found to be largely comparable provided lowintrinsic emittance photocathodes can be employed.

Comparison of DC and SRF Photoemission Guns For High Brightness High Average Current Beam Production