Abstract
Coherent radiation emitted from a compressed electron bunch as it traverses the sharp edge regions of a magnetic chicane has been investigated at the Brookhaven National Laboratory Accelerator Test Facility. Electron beam measurements using coherent transition radiation interferometry indicate a 100 fs rms bunch accompanied by distinct distortions in energy spectrum due to strong self-fields. These self-fields are manifested in emitted high power THz radiation, which displays signatures of the phenomenon known as coherent edge radiation. Radiation characterization studies undertaken include spectral analysis, far-field intensity distribution, polarization, and dependence on the electron bunch length. The observed aspects of the beam and radiation allow detailed comparisons with start-to-end simulations.
Highlights
Novel types of coherent electromagnetic radiation sources based on electron beams, extending in spectrum from THz to x rays, are presently under intensive development in the scientific community
We report on measurements of the coherent radiation from electron bunches compressed to the levels expected in x-ray free-electron laser (FEL), 100–150 fs
Running the linac at phases forward of crest produces a scenario of over-compression of the electron beam; in this case, momentum spectrum modulation occurs earlier in the chicane compared to the optimal on-crest condition
Summary
Novel types of coherent electromagnetic radiation sources based on electron beams, extending in spectrum from THz to x rays, are presently under intensive development in the scientific community. In future light sources, a nondestructive bunch profile monitor may be developed by exploiting the CER observed from the chicane magnet compressors employed to achieve the necessary high peak current. Both beam and radiation measurements are compared to detailed start-to-end simulations, which produce many, but not all, of the attributes found in the experiment.
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