Design and performance of the APPLE-Knot undulator

Along with the development of accelerator technology, synchrotron emittance has continuously decreased. This results in increased brightness, but also causes a heavy heat load on beamline optics. Recently, optical surfaces with 0.1 nm micro-roughness and 0.05 µrad slope error (r.m.s.) have become commercially available and surface distortions due to heat load have become a key factor in determining beamline performance, and heat load has become a serious problem at modern synchrotron radiation facilities. Here, APPLE-Knot undulators which can generate photons with arbitrary polarization, with low on-axis heat load, are reported.

Source: Journal of Synchrotron Radiation - June 9, 2015 Category: Physics Authors: Ji, F.Chang, R.Zhou, Q.Zhang, W.Ye, M.Sasaki, S.Qiao, S. Tags: undulator Knot undulator figure-8 undulator APPLE undulator APPLE-8 undulator Apple-Knot undulator research papers Source Type: research