In this paper we consider a klystron-like mechanism of ampli cation of parasitic density modulations in an electron bunch passing a magnetic bunch compressor. Analytical expressions are derived for the small-signal gain. The main emphasis is put on analysis of coherent synchrotron radiation (CSR) e ects. Preprint submitted to Nuclear Instruments and Methods

We have recently presented a new approach to the It follows that the solution of our equation of moproblem of radiation reaction in non-relativistic tion (1) is electrodynamics and obtained an equation of mov(t)_=x(t) tion which does not exhibit the problems associated with the well-knownAbraham—Lorentz equation [1]. 1 r But since the latter result can be derived using only =v(—oo)+ ~ J dt’f(t’...

A Mourre-type estimate is derived for the pseudorelativistic Brown–Ravenhall operator describing an atomic electron in a specific magnetic field of constant direction. As a consequence it is shown that its point spectrum is finite in R\{m} if the Coulomb potential strength γ is below 2 . An extension of the Mourre-type estimate to the exact block-diagonalized Dirac operator is also discussed. P...

Limits of the electron beam density in the focus are evaluated. As it shown, the maximal beam density is achievable in the relativistic vacuum diode with the needle anode. In such a device, the initial emittance of a beam is rather small. The electron beam gains emittance while being focused with positive ions into the anode due to collisions with the ions. Based on the paraxial beam model, the...

A novel two-stream relativistic klystron amplifier (RKA) is presented in which the amplification of stimulated beam modulation is achieved via the unstable two-stream interaction rather than the use of passive cavities. After a calculation of the limiting current, the amplification and saturation of the stimulated beam modulation are analyzed using a cold-fluid model and particle-in-cell simula...

We report detailed measurements of the transverse phase space distortions induced by magnetic chicane compression of a high brightness, relativistic electron beam to subpicosecond length. A strong bifurcation in the phase space is observed when the beam is strongly compressed. This effect is analyzed using several computational models and is correlated to the folding of longitudinal phase space...

beams at the underdense threshold M. C. Thompson, H. Badakov, J. B. Rosenzweig, G. Travish, N. Barov, P. Piot, R. Fliller, G. M. Kazakevich, J. Santucci, J. Li, and R. Tikhoplav Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA Lawrence Livermore National Laboratory, Livermore, California 94551, USA Far-Tech, Inc., San Diego, California 92121, USA...

The forecast of high energy electron fluxes in the radiation belts is important because the exposure of modern spacecraft to high energy particles can result in significant damage to onboard systems. A comprehensive physical model of processes related to electron energisation that can be used for such a forecast has not yet been developed. In the present paper a systems identification approach ...