dorsal/arxiv
View SchemaStatistical Optics approach to the design of beamlines for Synchrotron Radiation
| Authors | Gianluca Geloni, Evgeni Saldin, Evgeni Schneidmiller, Mikhail Yurkov |
|---|---|
| Categories | |
| ArXiv ID | physics/0603269 |
| URL | https://arxiv.org/abs/physics/0603269 |
Abstract
In this paper we analyze the image formation problem for undulator radiation through an optical system, accounting for the influence of the electron beam emittance. On the one hand, image formation with Synchrotron Radiation is governed by the laws of Statistical Optics. On the other hand, the widely used Gaussian-Shell model cannot be applied to describe the coherence properties of X-ray beams from third generation Synchrotron Radiation sources. As a result, a more rigorous analysis of coherence properties is required. We propose a technique to explicitly calculate the cross-spectral density of an undulator source, that we subsequently propagate through an optical imaging system. At first we focus on the case of an ideal lens with a non-limiting pupil aperture. Our theory, which makes consistent use of dimensionless analysis, also allows treatment and physical understanding of many asymptotes of the parameter space, together with their applicability region. Particular emphasis is given to the asymptotic situation when the horizontal emittance is much larger than the radiation wavelength, which is relevant for third generation Synchrotron Radiation sources. First principle calculations of undulator radiation characteristics (i.e. ten-dimensional integrals) are then reduced to one-dimensional convolutions of analytical functions with universal functions specific for undulator radiation sources. We also consider the imaging problem for a non-ideal lens in presence of aberrations and a limiting pupil aperture, which increases the dimension of the convolution from one to three. In particular we give emphasis to cases when the intensity at the observation plane can be presented as a convolution of an impulse response function and the intensity from an ideal lens.
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"abstract": "In this paper we analyze the image formation problem for undulator radiation\nthrough an optical system, accounting for the influence of the electron beam\nemittance. On the one hand, image formation with Synchrotron Radiation is\ngoverned by the laws of Statistical Optics. On the other hand, the widely used\nGaussian-Shell model cannot be applied to describe the coherence properties of\nX-ray beams from third generation Synchrotron Radiation sources. As a result, a\nmore rigorous analysis of coherence properties is required. We propose a\ntechnique to explicitly calculate the cross-spectral density of an undulator\nsource, that we subsequently propagate through an optical imaging system. At\nfirst we focus on the case of an ideal lens with a non-limiting pupil aperture.\nOur theory, which makes consistent use of dimensionless analysis, also allows\ntreatment and physical understanding of many asymptotes of the parameter space,\ntogether with their applicability region. Particular emphasis is given to the\nasymptotic situation when the horizontal emittance is much larger than the\nradiation wavelength, which is relevant for third generation Synchrotron\nRadiation sources. First principle calculations of undulator radiation\ncharacteristics (i.e. ten-dimensional integrals) are then reduced to\none-dimensional convolutions of analytical functions with universal functions\nspecific for undulator radiation sources. We also consider the imaging problem\nfor a non-ideal lens in presence of aberrations and a limiting pupil aperture,\nwhich increases the dimension of the convolution from one to three. In\nparticular we give emphasis to cases when the intensity at the observation\nplane can be presented as a convolution of an impulse response function and the\nintensity from an ideal lens.",
"arxiv_id": "physics/0603269",
"authors": [
"Gianluca Geloni",
"Evgeni Saldin",
"Evgeni Schneidmiller",
"Mikhail Yurkov"
],
"categories": [
"physics.acc-ph",
"physics.optics"
],
"title": "Statistical Optics approach to the design of beamlines for Synchrotron Radiation",
"url": "https://arxiv.org/abs/physics/0603269"
},
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