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TY - UNPB AU - Chen, Q.S. AU - Fan, M. AU - Hu, T. AU - Huang, J. AU - Pei, Y.J. AU - Qin, B. AU - Tan, P. AU - Xiong, Y.Q. AU - Yang, J. AU - Yu, T. ED - Kuzin, Maxim ED - Schaa, Volker RW TI - Localisation of RF Breakdown Point in a Coaxial Load Linac Structure J2 - Proc. of RuPAC2016, St. Petersburg, Russia, November 21-25, 2016 C1 - St. Petersburg, Russia T2 - Russian Particle Accelerator Conference T3 - 25 LA - english AB - A compact terahertz free electron laser (THz-FEL) prototype has been built up in Huazhong University of Science and Technology (HUST). In the prototype, a 0.85m long linac was designed to deliver electron beams with maximum energy of 14MeV and coaxial absorbing load instead of output coupler was selected to achieve a compact structure. In this case, no transmitted power signal could be used to determine the RF breakdown point (RFBP) in the linac cavity. Here we reported how the RFBP can be localized with just the input and reflected power signals through two methods. One refers to the analysis of time delay of the two signals and the other refers to the calculation of amplitude of the two signals. Quantitative analysis showed the two methods were well consistent with each other and indicated the RFBP located at the end of the linac cavity. PB - JACoW CP - Geneva, Switzerland ER -