TY - CPAPER
AU - Mak, A.
AU - Curbis, F.
AU - Werin, S.
TI - Further Studies of Undulator Tapering in X-Ray FELs
J2 - Proc. of FEL2015
AB - We further the studies of the model-based optimization of tapered free-electron lasers presented in a recent publication [Phys. Rev. ST Accel. Beams 18, 040702 (2015)]. Departing from the ideal case, wherein the taper profile is a smooth and continuous function, we consider the more realistic case, with individual undulator segments separated by break sections. Using the simulation code GENESIS, we apply our taper optimization method to a case, which closely resembles the FLASH2 facility in Hamburg, Germany. By comparing steady-state and time-dependent simulations, we examine how time-dependent effects alter the optimal taper scenario. From the simulation results, we also deduce that the "traditional" empirical method, whereby the intermediate radiation power is maximized after closing every undulator gap, does not necessarily produce the highest final power at the exit of the undulator line.
PB - JACoW
CY - Geneva, Switzerland
SP - 321
EP - 326
KW - undulator
KW - simulation
KW - electron
KW - radiation
KW - laser
DA - 2015/12
PY - 2015
SN - 978-3-95450-134-2
DO - 10.18429/JACoW-FEL2015-TUP002
UR - http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/tup002.pdf
ER -