Design and characterization of a kicker for the Tsinghua Thomson scattering storage ring

• Published in: Results in physics Vol. 29; p. 104729
• Main Authors: Zhu, Pengrui, Huang, Wenhui
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2021; Elsevier
• Subjects: Beam experiment; Compact storage ring; Impedance measurement; Single-turn injection; Strip-line kicker; Strip-line kicker; Impedance measurement; Single-turn injection; Compact storage ring; Beam experiment
• ISSN: 2211-3797; 2211-3797
• DOI: 10.1016/j.rinp.2021.104729

•Under the premise of perfect matching transmission, the electrode size and shape are optimized to meet even-mode matching, enabling a maximum electric field below the breakdown threshold and the best possible field homogeneity.•The tapered structure further reduces the maximum electric field and beam-coupling impedance.•The coaxial wire method and Goubau line method both obtain good results in agreement with simulations of beam-coupling impedance.•The deflecting angle of the kicker is verified by double screens in the beam experiments. The injection scheme of the Tsinghua Thomson scattering storage ring consists of a kicker and a dipole. The pulse length of the kicker deflection should be less than the revolution period, which is a very difficult challenge to overcome in the kicker design due to the compact size of the ring. In this paper, we present the complete design of a prototype stripline kicker based on mode matching, field homogeneity, the maximum electric field and the beam-coupling impedance. The perfect matching transmission of pulse voltage and excellent field homogeneity are realized by optimizing the electrode. A prototype kicker is built, and subsequent tests and beam experiments are carried out. The reflection parameter (S11) measurements confirm the match between the kicker and power supply. The beam-coupling impedance is tested with a coaxial wire and Goubau line, and the results are consistent with the simulations. The beam experiment in the TTX directly proves the transverse deflection of a charged-particle beam passing through the kicker. The stripline kicker will be installed in the storage ring for beam injection and extraction.