Perturbation of the energy loss spectra for an accelerated electron beam due to the photo injector exit

Physics Department, The Hashemite University, PO Box 330116, Zarqa 13133, Jordan

Corresponding author: wael_salahh@Hotmail.com

Received: 6 November 2001
Revised: 31 May 2002
Accepted: 23 August 2002
Published online: 19 November 2002

Abstract

The influence of the photoinjector exit hall on the energy loss for an accelerated electron beam is investigated, by calculating the total energy transferred from the electrons to the wakefields, which are driven by the beam. The obtained energy loss is compared to those previously obtained for a ‘pill-box’ cavity [9]. This comparison shows that the influence of this hall, in terms of energy loss, varies over the beam length. It is strongest in the middle of the beam and decreases towards both ends. In consequence of this perturbation, the center of the beam is displaced from its initial position during the first phase (t < 200 ps) where the exit aperture has no effect to a new equilibrium position which takes place at 200 < t < 250 ps.