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TY - CONF AU - Wei, T. AU - Li, P. AU - Li, Y. AU - Pflüger, J. ED - Schaa, Volker RW ED - Ji, Daheng ED - Li, Lu ED - Zhao, Ning TI - Spontaneous Radiation of High-order Magnetic Field Undulator J2 - Proc. of SAP2017, Jishou, China, 28-30 August 2017 C1 - Jishou, China T2 - Symposium on Accelerator Physics T3 - 13 LA - english AB - Based on the purpose of concision, nearly all the undulator radiation formulas have maken an assumption that the guiding magnetic field is a sinusoid wave. The assumption is consistent with the truth if the ratio of undulator gap to period length is large enough. However, high-order magnetic field exists widely in most undulators, especially those with long period length and short gap. This paper will derive the radiation output equations of high-order magnetic field undulator, what's more, the formulas are validated through numerical simulation with code SPECTRA. PB - JACoW CP - Geneva, Switzerland SP - 146 EP - 149 KW - ion KW - undulator KW - radiation KW - electron KW - free-electron-laser DA - 2018/02 PY - 2018 SN - 978-3-95450-199-1 DO - 10.18429/JACoW-SAP2017-TUPH09 UR - http://jacow.org/sap2017/papers/tuph09.pdf ER -