An X-band Electron Linear Accelerator

Abstract

A 2 MeV electron linear accelerator or π/2 mode travelling wave type has been designed and built. The accelerating microwave frequency is 8976 Mc/s. The RF structure of the S-band MARK-IV accelerator at Stanford University (2856 Mc/s) is scaled down to X-band. In order to comply with the decrease of the electric field strength, several additional cavities are interposed in the buncher section. The RF power of 200 kW is supplied by a frequency-tunable magnetron, The injection energy of electrons is 185 keV. The RF phase velocity increases from 0.6556c to 0.9400c in the buncher, and stays at 0.96c in the regular section. The electron energy obtained is 1.8 MeV with output current of 10 mA, pulse length 2μsec, and pulse repetition rate 50, 100, 200 pps.