Journal ArticleDOI
Random errors in undulators and their effects on the radiation spectrum
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TLDR
In this paper, the effects of random field errors on the performance of practical undulators are explored. But the results of these effects are limited by limiting conditions on its validity, and they are based on two universal functions, which are simple combinations of the basic undulator parameters, and are compared with the predictions of the universal functions.Abstract:
Undulators and wigglers are central components of free-electron lasers and proposed new high-brightness synchrotron radiation light sources. This paper explores the effects of random field errors on the performance of practical undulators. An approximate theory of these effects is derived, along with limiting conditions on its validity. The result of this work is a description of the loss of radiated intensity by two universal functions. The functions’ arguments are simple combinations of the basic undulator parameters. Simple numerical simulation methods are presented, and numerical results are compared with the predictions of the universal functions. Finally, possible solutions to the problem of random errors in undulators are discussed.read more
Citations
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Journal ArticleDOI
Limitations on the use of the pulsed-wire field measuring technique☆
TL;DR: In this article, a new field error measurement technique has been developed that has the usual advantages of a null technique, demonstrates high sensitivity to field errors, and is rapid and simple to employ.
Journal ArticleDOI
Tunable Coherent X-rays
TL;DR: A modern 1- to 2-billion-electron-volt synchrotron radiation facility (based on high-brightness electron beams and magnetic undulators) would generate coherent (laser-like) soft x-rays of wavelengths as short as 10 angstroms, which could be used for phase- and element-sensitive microprobing of biological assemblies and material interfaces as well as reserch on the production of electronic microstructures with features smaller than 1000Angstroms.
Journal ArticleDOI
Undulator radiation for at-wavelength interferometry of optics for extreme-ultraviolet lithography.
David Attwood,Gary E. Sommargren,Raul Beguiristain,Khanh Nguyen,Jeffrey Bokor,Natale M. Ceglio,Keith Jackson,Masato Koike,James A. Underwood +8 more
TL;DR: Techniques are described for at-wavelength interferometry of multilayer coated optics designed for use in extreme-ultraviolet lithography and several types of interferometer that might be suitable at these short wavelengths.
Journal ArticleDOI
Analytical account for a planar undulator performance in a constant magnetic field
TL;DR: In this paper, the influence of constant magnetic constituents on the radiation of high-energy electrons in a planar undulator was analyzed and the effect of the constant magnetic field on the UR was compared with other common spectrum distortions in UR sources.
Journal ArticleDOI
In search of a meaningful field-error specification for wigglers
TL;DR: In this paper, an alternative field-quality characterization in terms of trajectory wander and cumulative phase shake was proposed, which showed a significantly improved correlation with performance, particularly in light of the possibilities for optimized error ordering.
References
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First Operation of a Free-Electron Laser
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TL;DR: A free-electron laser oscillator has been operated above threshold at a wavelength of 3.4 µm as discussed by the authors, where µm is the number of free electrons in a single photon.
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TL;DR: A storage-ring free-electron laser oscillator has been operated above threshold at a visible wavelength in this article, where the oscillator was operated at a cost of $6500.
Journal ArticleDOI
A short‐period helical wiggler as an improved source of synchrotron radiation
TL;DR: In this paper, a helical wiggler was proposed as an improved source of synchrotron radiation from high-energy electron storage rings, where electrons were made to travel in a short period helix by a transverse helical magnetic field.
Journal ArticleDOI
Relationship between mean radiated energy, mean squared radiated energy and spontaneous power spectrum in a power series expansion of the equations of motion in a free-electron laser
TL;DR: The classical mean energy radiated by electrons in a free-electron laser with a symmetric magnet is equal to one-half the derivative, with respect to energy, of the classical mean squared radiated energy as mentioned in this paper.
Journal ArticleDOI
Permanent magnet undulators
TL;DR: In this article, the authors compared pure rare earth cobalt (REC) undulators and hybrid undulators, using both REC and steel, with conventional and superconducting undulators.