Abstract
A micropitched plasma undulator is proposed for the first time. It is composed of an array of hundreds of discharged and pinched slender columns of plasma. Two kinds of undulating forces on the electron beam can be considered: one is a periodic magnetic field generated by the electric currents flowing through the array of the small radius plasma columns and the other is a periodic electrostatic field generated by the interaction of the relativistic electron beam with the rippled density of the plasma. Methods for both producing and stabilizing the array of the plasma columns are discussed. The effects of collisions between the plasma particles and the electron beam on the orbit and the momentum of the electrons are also discussed, leading to the conclusion that they can be negligibly small, as far as the gas pressure in the chamber leaking from the plasma region does not disturb the performance of the electron accelerator.
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