| Paper | Title | Page |
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MOP029 |
A Novel Design of a Dielectric-filled Cavity BPM for HUST-PTF | |
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| To guarantee proton therapy safety and effectivity, non-invasive beam diagnostic¿NBD¿ devices are mandatory to precisely monitor the beam parameters during patient treatment. However, the clinical proton beams have characters of low currents and frequencies, which impose challenges for the design to improve the diagnosis resolution. A dielectric-filled racetrack cavity-type BPM has been studied deeply to compact its size while maintaining high diagnosis sensitivity. Moreover, the cross-talk between X and Y directions is effectively suppressed to ensure the diagnosis precision. The simulation and calculation results show that the cavity BPM has sufficient position sensitivity and signal-to-noise ratio. The signal-to-noise ratio can ba as large as 16.2 even when the beam intensity is 0.35 nA. The design studies results show that the dielectric-filled racetrack cavity is a potential candidate for a non-destructive beam position detector in HUST-PTF. | ||
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TUP019 |
Femtosecond Relativistic Electron Bunch Compression and Diagnosis using Terahertz-driven Resonators | |
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Funding: This work is supported by the National Natural Science Foundation of China (12235005) and the Science and Technology Project of State Grid (5400-202199556A-0-5-ZN). Ultrafast electron beams lengthening and time jitter severely degrade the temporal resolution in electron-laser applications, such as ultrafast electron diffraction (UED). In recent years, terahertz-driven devices have shown great potential in beam manipulation and diagnostics. This paper reports an all-optical method for compressing and characterizing a 3 MeV electron beam using single-cycle terahertz radiation. A THz buncher longitudinally compresses the electron beams, and the resulting shortest bunch length and arrival time are measured using a transverse THz field in a downstream terahertz slit. Particle tracking simulation shows that the bunch is compressed more than 13 times from 54 fs to 4 fs, and the arrival time jitter is reduced from 100 fs to 21 fs. This method effectively manipulates the beam longitudinal phase space, compresses the beam length, and suppresses the time jitter. It is expected to significantly impact ultrafast science and be applied in other accelerator applications. |
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