Speaker
Description
Controlling the energy profile of an electron beam is important for continuous and time resolved spectroscopic and imaging applications that require narrow energy spreads. The energy spread of an electron beam is fundamentally limited by the source, but energy spread that is correlated in time or space can be corrected using an appropriate time- and space-varying force. We present a method of reducing energy spread in photo-emitted electron beams in which laser-derived terahertz fields are used to shape the radial and temporal phase spaces. We show analytically and in particle tracking simulations the absolute limits of monochromation that this technique can achieve for a given source, and characterize non-ideal effects that occur at higher frequencies. The interaction is facilitated by a mirror which is reflective to terahertz and largely transmissive to the electron beam, requiring current losses of only a few tens of percent. Our method significantly outperforms the current output of prism-based monochromators while achieving comparable monochromation.
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