Speaker
Description
The longitudinal bunch shape is important for beam dynamics and accelerator optimization. In our previous study, a capacitive pick-up type bunch shape monitor (CPU-BSM) was developed for nondestructive measurement of nonrelativistic ion-beam bunch shapes. However, beamline applications may require a larger aperture due to beam size, alignment tolerances, and installation constraints. In this study, a large-aperture CPU-BSM was designed using CST Studio Suite, and the effects of enlarged aperture on the input beam–signal response correlation were evaluated. As the distance between the beam and the pick-up electrode increased, the resulting changes in signal amplitude and frequency response were analyzed. In addition, impedance matching was optimized to minimize signal distortion. Subsequently, a reconstruction algorithm for the large-aperture pick-up geometry was newly developed and applied. This study evaluates the feasibility of a large-aperture CPU-BSM and provides a basis for applying CPU-BSMs to various beamline conditions. Finally, we discuss the electronics and control system for the large-aperture CPU-BSM and its application to longitudinal phase-space tomography at RAON.
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