Speaker
Description
Terahertz (THz)-driven accelerators are emerging as promising compact particle accelerators. By using higher frequency drivers, the threshold of vacuum breakdown can be significantly increased. Consequently, it is anticipated that the accelerating gradient can be enhanced, projecting an increase from the current 100 MV/m-order to 1 GV/m-class. To generate the high-field THz waves, laser-driven plasma schemes have been studied. However, these schemes typically produce broadband emissions, lacking the necessary high spectral density at a specific wavelength. Here we introduce novel methods aimed at concentrating THz energy into a narrow bandwidth by developing plasma oscillators. Traditional plasma-based narrowband THz sources focused on converting a plasma wave into an electromagnetic wave, but encountered challenges related to conversion efficiency. Here, we propose methods for generating plasma oscillators capable of emitting THz waves through a multipole radiation mechanism. Our approach involves two distinct schemes: plasma dipole oscillation and radially oscillating plasma oscillators. Numerical simulations confirm that both schemes effectively emit THz waves with field strengths of GV/m level and narrow spectra (<10%). Furthermore, we present preliminary studies showcasing electron acceleration using these THz waves, employing the ELEGANT code.
