Photocathode RF guns

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Abstract
‘‘Free‐electron oscillators and amplifiers require electron accelerators capable of delivering pulse trains of electron bunches of high charge density in a wiggler or undulator. A high electron density implies a high peak current (100 A to 2000 A) and a low transverse beam emittance (<80 π⋅mm⋅mrad, determined by matching the transverse size of the electron beam to the optical beam in the wiggler). Electron beam collider machines also require high peak currents (≳8nC in picoseconds) with extremely small emittances (<10 π⋅mm⋅mrad). Several approaches have been proposed to attain such performance. This article discuses the use of photocathodes in attaining the aforementioned performance requirements.’’ (AIP)

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