Abstract
The acceleration of single electrons and electron bunches by focused THz pulse pairs has been investigated by numerical simulations. The effect of the choice of the beam waist radius, the carrier-envelope phase, and the propagation direction of the THz pulses on the energy of the accelerated electrons was investigated. The acceleration of electron bunches from rest up to 150 keV was predicted using single-cycle THz pulses with 1 mJ energy and a central frequency in the 0.1 THz to 3.0 THz range. The post-acceleration of electrons by pairs of focused THz pulses has also been proposed.
Highlights
Conventional particle accelerators, based on radio-frequency fields, are rather complex and costly devices
In order to reduce the decelerating effect of the positive part of the THz pulse (figure 1(b)), we examined the optimal choice of the 1/e2 intensity beam waist radius (w0) on the final kinetic energy of the initially standing electrons (Einitial = 0 keV at x0 = 0 position) in the cases of the THz sources represented in table 1
Investigations were performed at different THz frequencies based on experimentally achieved or numerically calculated THz pulse parameters
Summary
Conventional particle accelerators, based on radio-frequency fields, are rather complex and costly devices. THz pulses have a wavelength about two orders of magnitude longer than that of visible or nearinfrared pulses This enables a significant increase in both the interaction length and the number of particles, as compared to laser-driven schemes. Due to their picosecondlong period, more precise phase synchronization can be achieved between the particles and an accelerating THz field. The injection of electrons is accomplished by ionizing atoms in a gas jet with a short laser pulse and by obstructing part of the THz beams in the initial and post-acceleration stages, respectively. The generated electrons are accelerated by the superposition of the electric fields of the two THz pulses (figure 1(b)).
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