Abstract
We present a new method for computation of radiation spectra in the non-linear regime of operation of inverse Compton sources characterized by high laser intensities. The resulting simulations agree well with the experiments. Increasing the laser intensity changes the longitudinal velocity of the electrons during their collision, leading to considerable non-linear broadening in the scattered radiation spectra. The effects of such ponderomotive broadening are so deleterious that most inverse Compton sources either remain at low laser intensities or pay a steep price to operate at a small fraction of the physically possible peak spectral output. This ponderomotive broadening can be reduced by a suitable frequency modulation (also referred to as “chirping”, which is not necessarily linear) of the incident laser pulse, thereby drastically increasing the peak spectral density. This frequency modulation, included in the new code as an optional functionality, is used in simulations to motivate the experimental implementation of this transformative technique.
Highlights
We present a new method for computation of radiation spectra in the non-linear regime of operation of inverse Compton sources characterized by high laser intensities
The effects of such ponderomotive broadening are so deleterious that most inverse Compton sources either remain at low laser intensities or pay a steep price to operate at a small fraction of the physically possible peak spectral output
This ponderomotive broadening can be reduced by a suitable frequency modulation of the incident laser pulse, thereby drastically increasing the peak spectral density
Summary
– SENSE computes spectra of the scattered radiation in ICS by integrating a spectrum d2 E/dωdΩ due to a collision of a single electron with a 3D laser pulse over an entire distribution of electrons. – We simulate the Dresden experiment [24] using both CAIN [25] and SENSE We assume that both the laser pulse and the electron beam are gaussian-distributed with rms sizes as reported in Table 1 [24]. The main idea behind laser chirping is the following: in order to minimize the spectral width in the lab frame, one should arrange the frequency in the beam frame to emit radiation Doppler shifted back to a constant frequency in the lab frame This results in the judicious modulation of the frequency of the incoming laser pulse.
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