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This paper describes a novel scheme for integrating a coherent THz source inthe baseline of the LCLS facility. Any method relying on the spent electronbeam downstream of the baseline undulator should provide a way of transportingthe radiation up to the experimental floor. Here we propose to use the dumparea access maze. In this way the THz output must propagate with limited sizeat least for one hundred meters in a maze, following many turns, to reach thenear experimental hall. The use of a standard, discrete, open beam-waveguideformed by periodic reflectors, that is a mirror guide, would lead tounacceptable size of the system. To avoid these problems, in this paper wepropose an alternative approach based on periodically spaced metallic screenswith holes. This quasi-optical transmission line is referred to as an irisline. We present complete calculations for the iris line using both analyticaland numerical methods, which we find in good agreement. We present a design ofa THz edge radiation source based on the use of an iris line. The proposedsetup takes almost no cost nor time to be implemented at the LCLS baseline, andcan be used at other facilities as well. The edge radiation source is limitedin maximally achievable field strength at the sample. An extension based on theuse of an undulator in the presence of the iris line, which is feasible at theLCLS energies, is proposed as a possible upgrade of the baseline THz source.

Scheme for generating and transporting THz radiation to the X-ray experimental floor at the LCLS baseline