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

TL;DR

This paper proposes a compact, high-power narrow-band THz radiation source using a photocathode RF gun to generate subpicosecond electron bunches, achieving a peak power of 2 MW at 0.24 THz within a 1.2-meter setup.

Contribution

The paper introduces a novel scheme combining a photocathode RF gun with a dielectric-lined waveguide to produce narrow-band THz radiation efficiently.

Findings

Generation of 800 pC electron bunches directly from the RF gun.

Narrow emission spectrum peaked at 0.24 THz with 2 MW peak power.

Compact setup with a length of about 1.2 meters.

Abstract

Narrow-band THz coherent Cherenkov radiation can be driven by a subpicosecond electron bunch traveling along the axis of a hollow cylindrical dielectric-lined waveguide. We present a scheme of compact THz radiation source based on the photocathode rf gun. On the basis of our analytic result, the subpicosecond electron bunch with high charge (800pC) can be generated directly in the photocathode rf gun. A narrow emission spectrum peaked at 0.24 THz with 2 megawatt (MW) peak power is expected to gain in the proposed scheme (the length of the facility is about 1.2 m), according to the analytical and simulated results.