Abstract
We present a design methodology for developing ultrasmall electron injectors and accelerators based on cascaded cavities excited by short multicycle THz pulses obtained from laser-driven THz generation schemes. Based on the developed concept for optimal coupling of the THz pulse, a THz electron injector and two accelerating stages are designed. The designed electron gun consists of a four cell cavity operating at 300 GHz and a door-knob waveguide to coaxial coupler. Moreover, special designs are proposed to mitigate the problem of thermal heat flow and induced mechanical stress to achieve a stable device. We demonstrated a gun based on cascaded cavities that is powered by only 1.1 mJ of THz energy in 300 cycles to accelerate electron bunches up to 250 keV. An additional two linac sections can be added with five and four cell cavities both operating at 300 GHz boosting the bunch energy up to 1.2 MeV using a 4-mJ THz pulse.
Highlights
The conventional techniques to implement particle acceleration are based on radio-frequency cavities
We present a design methodology for developing ultrasmall electron injectors and accelerators based on cascaded cavities excited by short multicycle THz pulses obtained from laser-driven THz generation schemes
The designed electron gun consists of a four cell cavity operating at 300 GHz and a door-knob waveguide to coaxial coupler
Summary
The conventional techniques to implement particle acceleration are based on radio-frequency (rf) cavities. Considering that 1° in IR corresponds to just 28 nm, the bunch length and the bunch charge is tightly limited in IR acceleration Another challenging issue in this scheme is the timing jitter between the optical pulse and the electron bunches that should be kept below 100 as in order to provide a 1°-level resolution phase stability. Considering the already achieved percent level efficiencies in the optical generation of THz pulses [27,28,29,30,31] and the available high-energy picosecond to nanosecond lasers, MeV accelerators seem feasible with present technology.
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