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TY - CONF AU - Davidyuk, I.V. AU - Shevchenko, O.A. AU - Tcheskidov, V.G. AU - Vinokurov, N.A. ED - Schaa, Volker R.W. ED - Decking, Winfried ED - Sinn, Harald ED - Geloni, Gianluca ED - Schreiber, Siegfried ED - Marx, Michaela TI - Variable-Period Variable-Pole Number Hybrid Undulator Design for Novosibirsk THz FEL J2 - Proc. of FEL2019, Hamburg, Germany, 26-30 August 2019 CY - Hamburg, Germany T2 - Free Electron Laser Conference T3 - 39 LA - english AB - The undulator developed for the first FEL of Novosibirsk FEL facility employs variable-period structure based on the hybrid undulator scheme with poles splinted into halves. The design was adapted to deliver optimal performance, estimations were made based on results of three-dimensional field simulations. According to the modeling results, the undulator will not only widen significantly the first FEL tuning range moving the long-wavelength border of the first harmonic from 200 µm to 450 µm but also provide wider aperture and increase efficiency at shorter wavelengths. PB - JACoW Publishing CP - Geneva, Switzerland SP - 531 EP - 534 KW - undulator KW - FEL KW - electron KW - radiation KW - permanent-magnet DA - 2019/11 PY - 2019 SN - "" SN - 978-3-95450-210-3 DO - doi:10.18429/JACoW-FEL2019-WEP094 UR - http://jacow.org/fel2019/papers/wep094.pdf ER -