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In a THz FEL oscillator, the undulator and optical cav-ity are the key components for radiation. In this paper, we present an integrated optimization of the systematic parameters under the requirement of high compactness. The joint influence of the undulator and resonator on the FEL performance introduces a multi-parameter coupling that complicates the design. Therefore, a sequential ap-proach is used: the undulator and cavity are theoretically designed within constraints, followed by 3D simulation tuning of key parameters to maximize micropulse and macropulse energy. The joint GENESIS and OPC simula-tions show that, with peak currents exceeding 100 A, the output at 30 µm reaches a micropulse energy of 65 µJ and a macropulse energy of 139 mJ, while at 100 µm the output also meets the design requirements, providing a reliable basis for further implementation.
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