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@inproceedings{naito:ipac2021-mopab330,
author = {D. Naito and Y. Honda and T. Miyajima and N. Yamamoto},
title = {{Production and Performance Evaluation of a Compact Deflecting Cavity to Measure the Bunch Length in the cERL}},
booktitle = {Proc. IPAC'21},
pages = {1023--1026},
eid = {MOPAB330},
language = {english},
keywords = {cavity, resonance, vacuum, coupling, impedance},
venue = {Campinas, SP, Brazil},
series = {International Particle Accelerator Conference},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
issn = {2673-5490},
isbn = {978-3-95450-214-1},
doi = {10.18429/JACoW-IPAC2021-MOPAB330},
url = {https://jacow.org/ipac2021/papers/mopab330.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-MOPAB330},
abstract = {{At the KEK compact energy recovery linac, we try to generate an infrared free-electron laser (FEL). To generate the FEL, an electron bunch should be compressed along the longitudinal direction. The measurement of the bunch length is key to optimize the bunch compression. We plan to measure the bunch length by deflecting cavities in the burst mode. The deflecting cavities are required to be a time resolution of 33 fs in order to not only measure the bunch length but also resolve the structure inside the electron bunch. To achieve the requirement, we developed a c-band cavity whose RF input port is compact. The deflecting cavity is a single cell and normal conducting cavity. The deflection mode of the cavity is TM110. The 12 cavities will be located at the exit of undulators. In this presentation, we explain the design of our cavity and report the production of the first cavity. We also report the evaluation of the resonance frequency, the unloaded Q and the external Q of the cavity. From the measurements and simulations, the R/Q is estimated to be 1 mega orms. The time resolution of the cavity is expected to be 400 fs when the input RF power is 1 kW and the beam energy is 20 MeV.}},
}