TY - GEN
T1 - Analysis and correction of in-vacuum undulator misalignment effects in a storage ring synchrotron radiation source
AU - Chubar, O. V.
AU - Kitegi, C.
AU - Chen-Wiegart, Y. C.K.
AU - Hidas, D.
AU - Hidaka, Y.
AU - Tanabe, T.
AU - Williams, G.
AU - Thieme, J.
AU - Caswell, T.
AU - Rakitin, M.
AU - Wiegart, L.
AU - Fluerasu, A.
N1 - Publisher Copyright:
© 2017 CC-BY-3.0 and by the respective authors
PY - 2017/7
Y1 - 2017/7
N2 - In-vacuum undulators (IVU) are currently extensively used at light source facilities, in particular in medium-energy storage rings, for the production of high-brightness and high-flux hard X-rays. The relatively small (~5 mm or less) vertical magnetic gaps used in these planar undulators make them rather sensitive to the accuracy of the alignment of magnet arrays with respect to the electron orbit in the vertical plane. Based on commissioning results of hard X-ray beamlines at NSLS-II, misalignment of IVU with respect to the electron beam was found to be frequent among the reasons for spectral “underperformance”. We present results of analyses of different IVU misalignment effects on the magnetic field “seen” by the electron beam and on the emitted undulator radiation spectra. An example of applying spectrum-based IVU alignment, which resulted in a ~2-fold increase in spectral flux at one of the NSLS-II beamlines, is presented.
AB - In-vacuum undulators (IVU) are currently extensively used at light source facilities, in particular in medium-energy storage rings, for the production of high-brightness and high-flux hard X-rays. The relatively small (~5 mm or less) vertical magnetic gaps used in these planar undulators make them rather sensitive to the accuracy of the alignment of magnet arrays with respect to the electron orbit in the vertical plane. Based on commissioning results of hard X-ray beamlines at NSLS-II, misalignment of IVU with respect to the electron beam was found to be frequent among the reasons for spectral “underperformance”. We present results of analyses of different IVU misalignment effects on the magnetic field “seen” by the electron beam and on the emitted undulator radiation spectra. An example of applying spectrum-based IVU alignment, which resulted in a ~2-fold increase in spectral flux at one of the NSLS-II beamlines, is presented.
UR - https://www.scopus.com/pages/publications/85119699918
M3 - Conference contribution
AN - SCOPUS:85119699918
T3 - IPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference
SP - 1663
EP - 1665
BT - IPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference
PB - Joint Accelerator Conferences Website - JACoW
T2 - 8th International Particle Accelerator Conference, IPAC 2017
Y2 - 14 May 2017 through 19 May 2017
ER -