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TY - UNPB AU - Wang, L. ED - Schaa, Volker RW ED - Huang, Wenhui ED - Yan, Xueqing ED - Tang, Chuanxiang ED - Li, Lu TI - Simulation of Efficient Interaction Between Terahertz Pulse and Electron Beam J2 - presented at SAP2023, Xichang, China, 10-12 July 2023 CY - Xichang, China T2 - Symposium on Accelerator Physics T3 - 14 LA - english AB - Free electron laser(FEL) or inverse free electron laser(IFEL) coupling is one of the best options for efficient interaction of electron beam and radiation in the terahertz frequency range, but the slippage effects heavily limit the efficiency. Here we use a waveguide to match the velocities of the terahertz pulse and electron beam, which extends the interaction length and allows a higher energy extraction. We design a GPT custom element to calculate the FEL and IFEL interaction in a waveguide. Under the "zero slippage" condition, it is possible to generate terahertz radiation with the center frequencies of 0.5~1THz. Our results also indicate an average energy efficiency of more than 10\%. The waveguide IFEL interaction driven by a near single-cycle THz pulse is studied as well. We discuss its application for acceleration and compression of a relativistic electron beam. Using a terahertz pulse with an energy of about 1 ¿J, our simulation predicts 160keV energy gain of an 8MeV electron beam and compression of a 1ps electron beam in a 0.3m undulator. ER -