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A possible THz Radiation Source with a Train of Short Pulses in the SPARC high brightness photoinjector

Boscolo Manuela

A radiofrequency electron gun followed by a compressor can generate trains of terahertz sub- picosecond electron pulses by illuminating the photocathode with a comb laser pulse. Any radiation process which does not change the electron distribution can be used to study the coherent spectrum of radiation emitted by a comb electron bunch. The coherent part of the spectrum is strongly enhanced by its N2 dependence, where N is the number of particles in the bunch, being interesting both as possible source of Far-Infrared Radiation (FIR) and as diagnostic tool of the bunch structure.

A feasibility study for a possible experiment at SPARC to be realized with the addition of a dedicated magnetic chicane is discussed. An optimization study of a magnetic chicane with a negative and variable R56 is studied, together with a set of parameters relative to the SPARC machine with the intent of demonstrating the feasibility of this experiment. The dynamics is studied within the SPARC system with the PARMELA code.

Conf. Proc. C 0806233, WEPC069
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