Erratum to “Axial coherent bremsstrahlung of type A in a diamond crystal” [Nucl. Instr. and Meth. B 201 (2003) 16–24]

Laser-Compton Scattering as a Potential Electron Beam Monitor

“…During the OTR measurements, the electron beam slits were open to a maximum (<= 5 cm). The electron beam angular spread was consistent with the previous measurements made by Fiorito on the same LINAC [6,8]. Figure 2 shows the experimental and optical setup.…”

“…During the experiment, the electron macrobunch length was varied between 2 and 20 ns and the electron bunch charge ranged from 1.4 to 8nC. A pair of slits located between two 22.5° bending magnets [6] enabled us to change the electron beam energy distribution as well as the electron beam current. The electron beam spot size and emittance were determined from optical transition radiation (OTR) measurements.…”

“…LCS natural energy spread as a function of the electron beam energy deviation. The electron beam energy spread was varied by changing the width of the 90° port slits [6]. The maximum slits width was about 5 cm.…”

“…This value remains constant as the width of the slits is increased. Therefore, only electrons with an energy deviation AEbeam ^ 420 keV are bent toward the interaction area [6]. Increasing the slits width above 0.9 cm would not affect the width of the Compton peaks but increase the electron beam current and spot size.…”

“…This interaction results in the emission of highly directed (peaked in the direction of the incident electron beam), mono-energetic (see below), highly polarized and tunable x-ray beams with a divergence on the order of l/y, where y is the energy of the electrons relative to the electron rest energy. LCS experimental observations of bright photons generated by backscattered laser photons from relativistic electrons were reported in literature [3][4][5] and more recently by K. Chouffani et al [6]. Figure 1 shows a schematic illustration of LCS geometry.…”