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TY - CONF AU - Cho, M.H. AU - Kang, H.-S. AU - Kim, G. AU - Shim, C.H. AU - Yang, H. ED - Schaa, Volker R.W. ED - Decking, Winfried ED - Sinn, Harald ED - Geloni, Gianluca ED - Schreiber, Siegfried ED - Marx, Michaela TI - Effect on FEL Gain Curve Using Phase Shifters J2 - Proc. of FEL2019, Hamburg, Germany, 26-30 August 2019 CY - Hamburg, Germany T2 - Free Electron Laser Conference T3 - 39 LA - english AB - Phase matching between FEL and electron beam should be precisely controlled for FEL amplification. Phase shifters located between undulators performs the phase matching. An electron beam can be controlled to be in the in- or out-phase by setting the phase shifters from the phase shifter scan. In this article, we show effects of FEL gain curve by setting the in- and out-phase of electron beam. We address reasons of the reduction of FEL intensity in the out-phase condition dividing the linear and saturation FEL amplification regimes. In the linear regime the gain curve is shifted, and in the saturation regime the electron loss occurs during the undulator tapering. Our results show agreements with experiments performed at PAL-XFEL. PB - JACoW Publishing CP - Geneva, Switzerland SP - 203 EP - 205 KW - FEL KW - electron KW - undulator KW - laser KW - simulation DA - 2019/11 PY - 2019 SN - 978-3-95450-210-3 DO - doi:10.18429/JACoW-FEL2019-TUP064 UR - http://jacow.org/fel2019/papers/tup064.pdf ER -