Performance of the synchrotron radiation monochromator of a channel-cut crystal with curved surfaces has been analyzed and measured. Comparing with conventional symmetric double-flat-crystal

we found that the throughput

bandwidth and beam exit stability of the channel cut-curved crystal were mainly affected by the asymmetric reflections of the extended beam and the Bragg axis deviation from exact position. It was concluded that the monochromator’s performance could be improved by enlarging dimensions of the reflecting surfaces

and improving precisions of the profiles machined and the Bragg axis positioned for the channel cut-curved crystal.