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| THPMK018 |
Design of a rotationally symmetric S-band photocathode RF gun |
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- Zh. X. Tang
USTC, Hefei, Anhui, People's Republic of China
- Z.G. He, W.W. Li, Y.J. Pei, L. Wang
USTC/NSRL, Hefei, Anhui, People's Republic of China
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The photocathode RF gun is one of the most critical components for high quality electron beam sources. The asymmetric multi-pole field contributes to the transverse emittance growth and degrades the beam quality. In order to overcome the problem, we propose a novel rotationally symmetric 1.6 cell RF gun to construct the symmetric field in this paper. The concrete proposal is that a coaxial cell with a symmetrical distribution of four grooves is concatenated to the first 0.6 cell at the photocathode end to form a new resonant cell (NRC) to mantain the symmetric multi-pole field in 1.6 cell. Our simulations indicate that 3D multi-pole fields of NRC are with the perfect symmetry. After that, the profile of the RF gun is optimized to improve the shunt impedance and mode separation and make the surface peak electric field at the photocathode end. Our simulations demonstrate promising outlook of using coaxial cell for photocathode RF guns with various applications.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2018-THPMK018
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