A large variety of the electron beam optics elements allow a large control over the phase space of the relativistic bunches. We study a scheme capable for generating the beam distribution consisting of several well-separated energy bands. Such a distribution is unstable and the two-stream instability driven by the space charge develops. We investigate the instability analytically and numerically.
Light sources of soft X-rays allow for various experiments in Biology, Chemistry, Physics, and Material Science. Currently existing high brightness sources are based on synchrotron radiation and require ~1GeV electron beams, which makes these facilities expensive. Cost reduction solutions such as the use of plasma wakefield accelerators or Compton sources at the reduced beam energy result in a significant decrease of the photon beam brightness. At the same time, development of a high brightness but affordable light source will allow for a larger number of experiments with X-rays facilitating new discoveries in Science.
We study of a novel scheme which may result in the next generation Compton source for soft X-rays. The scheme is based on creating an electron beam distribution consisting of several energy bands and allowing for the two-stream instability to develop resulting in a short scale density modulation. The wavelength of the microbunching caused by the two-stream instability strongly depends on the beam parameters and can be reduced down to soft X-ray wavelengths that are not achievable with other mechanisms. The efficiency of laser scattering by the electron beam strongly increases if electrons are bunched at the wavelength of the scattered radiation, since the radiation generated by each microbunch adds up in phase. Therefore, the microbunched beam can be used for increasing the brightness of the Compton source. We study the proposed scheme analytically and numerically. We demonstrate the development of the two-stream instability and discuss the possibilities of using the proposed scheme for various applications.
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