| Abstract: | Increasing the peak brightness is beneficial to various applications of the Thomson scattering X-ray source.A higher peak brightness of the scattered X-ray pulse demands a shorter scattering electron beam realized by beam compression in the electron beam-line.In this article,we study the possibility of compressing the electron beam in a typical S-band normal conducting photo-injector via ballistic bunching,through just adding a short RF linac section right behind the RF gun,so as to improve the peak brightness of the scattered x-ray pulse.Numerical optimization by ASTRA demonstrates that the peak current can increase from 50 A to300 A for a 500 pC,10ps FWHM electron pulse,while normalized transverse RMS emittance and RMS energy spread increases very little.Correspondingly,the peak brightness of the Thomson scattering X-ray source is estimated to increase about three times. |
