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The design of a new hybrid-type undulator with a fixed gap of 6.4mm, a period of 30mm and a length of 3.4m is presented. The fractional variations in deflection parameter K between segments of 130.4-m-long undulator line for the Linac Coherent Light Source (LCLS) must be ⩽1.5×10 −4 . Major design features and their choices are discussed. Lessons learned while working with this prototype are...