Abstract
Conventionally, electron guns with thermionic cathodes or field-emission cathodes are used for research or technological linear accelerators. RF-photoguns are used to provide the short electron bunches which could be used for FEL’s of compact research facilities to generate monochromatic photons. Low energy of emitted electrons is the key problem for photoguns due to high influence of Coulomb field and difficulties with the first accelerating cell simulation and construction. Contrary, plasma sources, based on the laser-plasma wakefield acceleration, have very high acceleration gradient but rather broad energy spectrum compared with conventional thermoguns or field-emission guns. The beam dynamics in the linear accelerator combines the laser-plasma electron source and conventional RF linear accelerator is discussed in this paper. Method to capture and re-accelerate the short picosecond bunch with extremely broad energy spread (up to 50 %) is presented. Numerical simulation shows that such bunches can be accelerated in RF linear accelerator to the energy of 50 MeV with output energy spread not higher than 1 % .
Highlights
The high brightness electron sources are usually based on photoguns
One possible way to solve the problems with higher bunch charges, shorter bunch lengths and longer lifetimes is to use the plasma electron sources
As mentioned above we will discuss the combination of plasma wakefield acceleration (PWA) electron source with output energy of few hundreds of keV and standing wave RF accelerating structure to generate the short (1 ps or less) electron bunches with the charge of 100 pC, variable output energy of 2050 MeV and narrow energy spectrum less than 1 %
Summary
The high brightness electron sources are usually based on photoguns. Photojnjectors should solve a number of tasks which sufficiently differs by the bunch parameters and operation regimes. One possible way to solve the problems with higher bunch charges, shorter bunch lengths and longer lifetimes is to use the plasma electron sources. As mentioned above we will discuss the combination of PWA electron source with output energy of few hundreds of keV and standing wave RF accelerating structure to generate the short (1 ps or less) electron bunches with the charge of 100 pC, variable output energy of 2050 MeV and narrow energy spectrum less than 1 %. It is proposed to use the cluster plasma jet with laser-plasma acceleration for electron bunch generation with energy above 1 MeV, length less than 1 ps and charge of 50200 pC [Shkurinov, 2017; Shkurinov, 2021; Semenov, 2019]
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