Design, realization, and testing of a brazing-free C-band radio frequency photogun
Year: 2025
Type: article
Abstract: Radio frequency (rf) photoguns are widely used in modern particle accelerator facilities, particularly in free electron lasers (FELs), as they provide very low-emittance, high-brightness electron bunches. Presently, the rf technology mostly used for photoguns is the S-band ( ∼ 3 GHz), with typical cathode peak fields of 80–120 MV/m and maximum repetition rates of ∼ 100 Hz. According to beam dynamics studies, the higher the peak electric fields on the cathode, the better the quality of the beam emerging from the gun. In this respect, S-band rf guns represent the state-of-the-art, both in terms of reachable cathode peak fields and repetition rates. An innovative C-band rf gun, operating at 5.712 GHz and aiming at reaching cathode peak fields larger than 160 MV/m, with repetition rates exceeding 400 Hz, has been designed, realized, and high-power tested. Its device consists of a 2.5-cell standing wave (SW) cavity with a four-port mode launcher whose overcoupled design allows it to operate with short rf pulses (300 ns). Its realization has been based on the new brazing-free technology developed and successfully tested at the Frascati Laboratories of the National Institute of Nuclear Physics (INFN-LNF, Italy). In the paper, we illustrate the design and realization performed by INFN-LNF, and its high-power rf test, which was conducted at the C-band test facility at the Paul Scherrer Institute (Switzerland).
DOI: 10.1103/jrth-j9sf
Authors: D. Alesini, F. Cardelli, G. Di Raddo, L. Faillace, M. Ferrario, A. Gallo, A. Giribono, G. Latini, S. Lauciani, A. Liedl, L. Pellegrino, L. Piersanti, S. Pioli, J. Scifo, B. Serenellini, G. J. Silvi, L. Spallino, A. Vannozzi, C. Vaccarezza, L. Ficcadenti, T. G. Lucas, L. Hol, P. Craievich
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
Award: G1477917006
OpenAlex ID: W4417267730