Compact narrow-band THz radiation source based on photocathode rf gun

摘要

Narrow-band THz coherent Cherenkov radiation can be driven by a subpicosecondelectron bunch traveling along the axis of a hollow cylindricaldielectric-lined waveguide. We present a scheme of compact THz radiation sourcebased on the photocathode rf gun. On the basis of our analytic result, thesubpicosecond electron bunch with high charge (800pC) can be generated directlyin the photocathode rf gun. A narrow emission spectrum peaked at 0.24 THz with2 megawatt (MW) peak power is expected to gain in the proposed scheme (thelength of the facility is about 1.2 m), according to the analytical andsimulated results.