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- W2013330228 abstract "Abstract Radial distribution measurements of the density j (r) in two (at a known focus plane position) or three beam cross-sections are enough for estimation of the angular distribution of the beam current density j (d r /d z) ( z coincides with the beam axis) when the electron beam current density can be characterised by a 2-D Gaussian distribution in the phase-space plane. The following assumptions are made: a linear approximation of the electron trajectories in the treated field-free drift region can be made and the effects due to collisions and space charges can be neglected. In the paper, we use the Monte Carlo procedure to process the experimental data j (x,y) to obtain a standard normal distribution j (r) for every plane z , where experimental investigations of the j (x, y) are made. A system of two (or three) equations is used to find the standard deviation σ d r /d z = σ r , of the normal distribution j (d r /d z) . Using known values of σ r 0 and σ r ′0 (in the focal plane) and a chosen portion p of the beam current, the important parameters: the emittance e p , the normalised emittance e n p and the brightness per 1 V accelerating voltage ( B / U ) p for this beam portion are estimated." @default.
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- W2013330228 date "2001-06-01" @default.
- W2013330228 modified "2023-09-26" @default.
- W2013330228 title "Use of radial distributions of the beam current density for evaluation of beam emittance and brightness" @default.
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- W2013330228 doi "https://doi.org/10.1016/s0042-207x(00)00423-1" @default.
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