A proposal of multipulse-driven split-ring resonator for femtosecond resolution bunch length measurement

Yang Xu; Jian Wang; Yifang Song; Kuanjun Fan; Oleg Meshkov; Xiaofei Li; Zhengqi Tian; Jinfeng Yang

doi:10.1117/12.2621151

1 July 2022 A proposal of multipulse-driven split-ring resonator for femtosecond resolution bunch length measurement

Yang Xu, Jian Wang, Yifang Song, Kuanjun Fan, Oleg Meshkov, Xiaofei Li, Zhengqi Tian, Jinfeng Yang

Proceedings Volume 12291, 1st International Conference on UltrafastX 2021; 1229108 (2022) https://doi.org/10.1117/12.2621151
Event: 1st International Conference on UltrafastX 2021, 2022, Xi'an, China

Abstract

Streak cameras based on THz-driven split-ring resonator (SRR) are recently proposed to achieve electron bunchlengthmeasurement with femtosecond resolution due to the available GV/m level streaking field. However, to apply the SRRtothe streaking experiment, the SRR needs to have a relatively large gap to accommodate the beamto traverse. Alargergap leads to higher electromagnetic power radiation, which requires high exciting THz power to compensate powerradiation to achieve a strong streaking field. The maximum stored energy in the gap is determined by the availableexciting THz power. If a single THz pulse drives the SRR, the achievable streaking field is not enough for highresolution because of the radiation diluting the stored energy. This paper proposes a novel method to illuminate theSRRwith multipulse, which can accumulate the energy stored in the gap to compensate the electromagnetic radiationuntil saturation and consequently enhance the resonance to a much higher peak field. We explore the effects of drivingpulseswith various intervals and obtain an optimal field enhancement factor up to 47 with the THz field strength of 1MV/m. The particle tracking simulation indicates that the multipulse-driven method can achieve the temporal resolution of 0.4fswith the central frequencies of SRR at 0.3 THz.

Citation Download Citation

Yang Xu, Jian Wang, Yifang Song, Kuanjun Fan, Oleg Meshkov, Xiaofei Li, Zhengqi Tian, and Jinfeng Yang "A proposal of multipulse-driven split-ring resonator for femtosecond resolution bunch length measurement", Proc. SPIE 12291, 1st International Conference on UltrafastX 2021, 1229108 (1 July 2022); https://doi.org/10.1117/12.2621151

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