טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentKaragodsky Vadim
SubjectX-Ray Source Based on Free Electron Beams
DepartmentDepartment of Electrical Engineering
Supervisors Professor Levi Schachter
Professor Emeritus David Schieber
Full Thesis textFull thesis text - English Version


Abstract

X-Ray generation via an interaction of a free electron beam with a counter- propagating laser pulse has been the subject of a theoretical investigation. The main advantages of this approach are compact dimensions and modest acceleration requirements, relatively to modern synchrotrons. The frequency of the radiated field is related to the frequency of the laser according to ωX-Ray=4γ2ωLaser; γ being the Lorentz relativistic energy factor. Commonly, X-Ray generation experiments harness a focused Gaussian laser. In the framework of this study it is proposed to use an optical Bragg waveguide instead, benefiting of its inherent extended confinement of the driving pulse. As a result, it is shown that for the same injected laser power and identical e-beam parameters, the intensity of the emitted X-Ray will increase by at least 1 order of magnitude, relatively to a configuration that employs an optically focused pulse.

Another immediate advantage of a guiding structure is the possibility to have a long interaction region, leading to narrow spectrum. The narrow spectrum is shown to be very sensitive to angular divergence of the electron beam and to fluctuations in γ. For example, a fluctuation of 0.1% in γ is enough to reduce the resonant peak by about 80%.