Hard x-ray or gamma ray laser by a dense electron beam

Abstract

A coherent x-ray or gamma ray can be created from a dense electron beam propagating through an intense laser undulator. It is analyzed by using the Landau damping theory which suits better than the conventional linear analysis for the free electron laser, as the electron beam energy spread is high. The analysis suggests that the currently available physical parameters would enable the generation of the coherent gamma ray of up to 100 keV. The electron quantum diffraction suppresses the FEL action, by which the maximum radiation energy to be generated is limited.

Unstable Electromagnetic Modes in Strongly Magnetized Plasmas

“…where α = kv 0z − ω + ω ce and β = v Eq. (1) shares similarity with the Landau damping analysis for a Langmuir wave [11,16]. From Eq.…”

Generating THz light from microwave

“…There have been exploding interests for a commercially-viable THz light source, as it would create new industries in the fusion plasma diagnostic, the molecular spectroscopy, the tele-communication and many others [1][2][3][4][5][6][7]. Numerous THz light sources have been invented so far [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], including the free electron laser [17][18][19], the gyrotron, the vacuum electronic device [11][12][13][14], the quantum cascade laser [15,16] and the laser-based technology. Surprisingly, however, THz light sources are often neither practical nor intense enough.…”

Langmuir wave undulator for terahertz radiation

“…(5) and hi is the ensemble average of the electron distribution over the space and velocity coordinate in the long-time limit [16,17]. The growth rate γ i from Eq.…”