Patent ID: 8134440
Filing Date: 2012-03-13
Classification: H05G,H05H

Abstract:
1. A planar-helical undulator for emitting 360° electrically variable photo radiation, comprising: a first coil and a second coil disposed opposite and equidistant from each other relative to an undulator axis, an axis of the first coil and an axis of the second coil and the undulator axis being parallel to each other so as to extend in a plane of axes, the first and second coils being of a same type, and the undulator axis forming a portion of a synchrotron beam axis; wherein each of the first and second coils includes a helical section and a planar section, each section having windings disposed in winding chambers, the winding chambers being disposed in succession so that the windings are disposed apart by a distance γ wherein the windings of each respective section are electrically connected in series, so that the planar section generates, when energized, a first magnetic field having an axis opposite to an adjacent magnetic field axis, and so that the helical section generates, when energized, a second magnetic field having an axis opposite and parallel to an adjacent magnetic field axis; wherein a bottom of each winding chamber is convex, and a region of a winding base having a largest radius of curvature is disposed nearest to the undulator axis; wherein a number of winding chambers of each planar section is two or more, and a number of winding chambers of each helical section is even and is two or more; wherein the helical section and the planar section of each coil have an equal number of winding chambers; and wherein the helical section and the planar section of each coil are equal in length, each planar section includes a circular ring-shaped winding chamber, the helical section and the planar section of each coil have a constant number of windings, and each planar section is disposed around the corresponding helical section.