Compact representations of partially coherent undulator radiation suitable for wave propagation
Abstract
Undulator radiation is partially coherent in the transverse plane, with the degree of coherence depending on the ratio of the electron beam phase space area (emittance) to the characteristic radiation wavelength λ. Numerical codes used to predict x-ray beam line performance can typically only propagate coherent fields from the source to the image plane. We investigate methods for representing partially coherent undulator radiation using a suitably chosen set of coherent fields that can be used in standard wave propagation codes, and discuss such “coherent mode expansions” for arbitrary degrees of coherence. In the limit when the electron beam emittance along at least one direction is much larger than λ the coherent modes are orthogonal and therefore compact; when the emittance approaches λ in both planes we discuss an economical method of defining the relevant coherent fields that samples the electron beam phase space using low-discrepancy sequences.
- Authors:
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1222045
- Alternate Identifier(s):
- OSTI ID: 1221642
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Special Topics. Accelerators and Beams
- Additional Journal Information:
- Journal Volume: 18; Journal Issue: 9; Journal ID: ISSN 1098-4402
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS
Citation Formats
Lindberg, Ryan R., and Kim, Kwang-Je. Compact representations of partially coherent undulator radiation suitable for wave propagation. United States: N. p., 2015.
Web. doi:10.1103/PhysRevSTAB.18.090702.
Lindberg, Ryan R., & Kim, Kwang-Je. Compact representations of partially coherent undulator radiation suitable for wave propagation. United States. https://doi.org/10.1103/PhysRevSTAB.18.090702
Lindberg, Ryan R., and Kim, Kwang-Je. Mon .
"Compact representations of partially coherent undulator radiation suitable for wave propagation". United States. https://doi.org/10.1103/PhysRevSTAB.18.090702.
@article{osti_1222045,
title = {Compact representations of partially coherent undulator radiation suitable for wave propagation},
author = {Lindberg, Ryan R. and Kim, Kwang-Je},
abstractNote = {Undulator radiation is partially coherent in the transverse plane, with the degree of coherence depending on the ratio of the electron beam phase space area (emittance) to the characteristic radiation wavelength λ. Numerical codes used to predict x-ray beam line performance can typically only propagate coherent fields from the source to the image plane. We investigate methods for representing partially coherent undulator radiation using a suitably chosen set of coherent fields that can be used in standard wave propagation codes, and discuss such “coherent mode expansions” for arbitrary degrees of coherence. In the limit when the electron beam emittance along at least one direction is much larger than λ the coherent modes are orthogonal and therefore compact; when the emittance approaches λ in both planes we discuss an economical method of defining the relevant coherent fields that samples the electron beam phase space using low-discrepancy sequences.},
doi = {10.1103/PhysRevSTAB.18.090702},
journal = {Physical Review Special Topics. Accelerators and Beams},
number = 9,
volume = 18,
place = {United States},
year = {Mon Sep 28 00:00:00 EDT 2015},
month = {Mon Sep 28 00:00:00 EDT 2015}
}
https://doi.org/10.1103/PhysRevSTAB.18.090702
Web of Science
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