Analysis and Correction of in-Vacuum Undulator Misalignment Effects in a Storage Ring Synchrotron Radiation Source

Chubar, Oleg; Caswell, Thomas; Chen-Wiegart, Yu-chen; Fluerasu, Andrei; Hidaka, Yoshiteru; Hidas, Dean; Kitegi, Charles; Rakitin, Maksim; Tanabe, Toshiya; Thieme, Juergen; Wiegart, Lutz; Williams, Garth

doi:10.18429/JACoW-IPAC2017-TUPAB140

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RIS citation export for TUPAB140: Analysis and Correction of in-Vacuum Undulator Misalignment Effects in a Storage Ring Synchrotron Radiation Source

TY - CONF
AU - Chubar, O.V.
AU - Caswell, T.A.
AU - Chen-Wiegart, Y.
AU - Fluerasu, A.
AU - Hidaka, Y.
AU - Hidas, D.A.
AU - Kitegi, C.A.
AU - Rakitin, M.S.
AU - Tanabe, T.
AU - Thieme, J.
AU - Wiegart, L.
AU - Williams, G.
ED - Schaa, Volker RW
ED - Arduini, Gianluigi
ED - Pranke, Juliana
ED - Seidel, Mike
ED - Lindroos, Mats
TI - Analysis and Correction of in-Vacuum Undulator Misalignment Effects in a Storage Ring Synchrotron Radiation Source
J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017
C1 - Copenhagen, Denmark
T2 - International Particle Accelerator Conference
T3 - 8
LA - english
AB - In-vacuum undulators (IVU) are currently very extensively used at different light source facilities, and 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, however, rather sensitive to the accuracy of alignment of magnet arrays with respect to electron orbit in the vertical plane. Based on results of commissioning of a number of IVUs at hard X-ray beamlines of NSLS-II, their eventual misalignment with respect to the electron orbit was found to be among frequent reasons of spectral underperformance of the beamlines. We will present results of simulations of different IVU misalignment effects on magnetic fields seen by electron beam and on the emitted undulator radiation spectra. The simulations show e.g. that an impact of angular misalignment of an IVU on the radiation spectrum can be minimized if the IVU elevation is selected to make the electron orbit to pass through the IVU magnetic center. Experimental results of spectrum-based alignment of IVUs at hard X-ray beamlines will be presented.
PB - JACoW
CP - Geneva, Switzerland
SP - 1663
EP - 1665
KW - undulator
KW - electron
KW - alignment
KW - radiation
KW - storage-ring
DA - 2017/05
PY - 2017
SN - 978-3-95450-182-3
DO - 10.18429/JACoW-IPAC2017-TUPAB140
UR - http://jacow.org/ipac2017/papers/tupab140.pdf
ER -