Abstract
This paper presents a new design for a helical permanent-magnet undulator. It can be easily implemented on a synchrotron source without engineering difficulty. The effect on the electron beam is discussed and found to be acceptable. Flux and brilliance are similar to those from conventional planar undulators. Heat load can be considerably reduced which makes it a very attractive device for the new generation of 6–8 GeV light sources. On the ESRF, very brilliant helical radiation is expected in the 0.5 to 10 keV photon energy range.
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