A short-period helical wiggler as an improved source of synchrotron radiation

Abstract

A new kind of wiggler is proposed as an improved source of synchrotron radiation from high-energy electron storage rings. The electrons are made to travel in a short-period helix by a transverse helical magnetic field. The radiation spectrum produced is calculated and it is shown that the helical wiggler design could produce a total intensity (photons sec−1 per unit bandwidth) improvement of several hundred and a brightness (photons sec−1 per solid angle per unit bandwidth) improvement of 4×104 over the present state of the art in synchrotron radiation sources.

The Properties of Undulator Radiation

“…Schott attention in the literature as reviewed as reviewed, for example, by Blewett, 1988 by Kim, 1989. Hofmann 's calculation of the spectral power per unit solid angle due to a single provided by Hofmann, 1986, andKrinsky er al., 1983, and an ab initio calculation has been given Kincaid, 1977. More recent treatments of the calculations, starting from Eq.…”

Multilayer optical elements for generation and analysis of circularly polarized X-rays

“…Numerous types of insertion devices have been proposed [2][3][4][5][6] , and some implemented [7,8], which would produce beams having predominantly elliptical or circular polarization on axis and, like bend magnets, having polarization states strongly dependent on observation angle. Complete characterization of the polarization of beams produced by such devices in general requires optical elements such as linear polarizers to measure the azimuthal linear polarization dependence, combined with quarter-wave plates to ascertain phase relationships of different components within the beam [9].…”

Angular Momentum of Twisted Radiation from an Electron in Spiral Motion

“…Generally, the real part of the time-averaged AM density j  of an electromagnetic field can be represented as a cross product of the linear momentum density p  and the position vector r  as follows 18 : By integrating Eq. (1) on a spherical surface that surrounds the source, the AM that the radiation field carries away can be expressed as 15 :…”