Coherent synchrotron radiation extraction from a bent beam pipe
Abstract
Coherent synchrotron radiation generated in a bending magnet can propagate far downstream and heat the beam pipe. We investigate a beam-free side outlet that diverts part of this radiation into a separate guide. We use a paraxial equation to calculate radiation generation in the bend and its division between the two guides. Modal and finite-difference solutions are used in the bend, and quadratic finite elements on a changing transverse mesh in the branching region. We check the paraxial approximation against full-wave solutions at selected frequencies. Separately, we calculate radiation attenuation in a conducting pipe without an outlet using complex modes that satisfy impedance boundary conditions. For this example, independently damped perfectly conducting modes underestimate the high-frequency transmitted power. For a 70×25 mm rectangular chamber with a 30∘ bend of radius 2.2 m and Gaussian bunches of rms length 10 μm, the selected outlet diverts about 53\% of the total outgoing radiation power into the beam-free channel.
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BibTeX
@misc{zagorodnov2026coherent,
title = {{Coherent synchrotron radiation extraction from a bent beam pipe}},
author = {Igor Zagorodnov and Dmitry Bazyl and Gennady Stupakov},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.31462},
eprint = {2610.31462},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.31462},
}
RIS
TY - UNPB
TI - Coherent synchrotron radiation extraction from a bent beam pipe
AU - Igor Zagorodnov
AU - Dmitry Bazyl
AU - Gennady Stupakov
PY - 2026
DA - 2026/10/22
PB - arXiv
DO - 10.48550/arxiv.2610.31462
UR - https://arxiv.org/abs/2610.31462
AB - Coherent synchrotron radiation generated in a bending magnet can propagate far downstream and heat the beam pipe. We investigate a beam-free side outlet that diverts part of this radiation into a separate guide. We use a paraxial equation to calculate radiation generation in the bend and its division between the two guides. Modal and finite-difference solutions are used in the bend, and quadratic finite elements on a changing transverse mesh in the branching region. We check the paraxial approximation against full-wave solutions at selected frequencies. Separately, we calculate radiation attenuation in a conducting pipe without an outlet using complex modes that satisfy impedance boundary conditions. For this example, independently damped perfectly conducting modes underestimate the high-frequency transmitted power. For a 70×25 mm rectangular chamber with a 30^∘ bend of radius 2.2 m and Gaussian bunches of rms length 10 μm, the selected outlet diverts about 53\% of the total outgoing radiation power into the beam-free channel.
ER -