Radio-frequency cavity field measurements through free falling bead
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arXiv
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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
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| _version_ | 1866910509840728064 |
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| author | Du, Xiaonan Groening, Lars |
| author_facet | Du, Xiaonan Groening, Lars |
| contents | This paper introduces a novel bead-falling measurement method for the precise and efficient mapping of electromagnetic fields within radio-frequency (RF) cavities, which are crucial components in the design of accelerators. The traditional bead-pull method, while effective, involves mechanical complexities and is prone to errors from wire perturbations. The innovative method reported here leverages the simplicity and accuracy of free-falling beads to mitigate these issues. This technique eliminates the need for a wire-pulley system, thereby simplifying the experimental setup and reducing potential mechanical errors. We detail the development and operational principles of this new method, including the design of a compact, portable measurement device that integrates a bead/droplet release system and a bead detection system linked to a Vector Network Analyzer (VNA). The device has been tested with a three-gap buncher cavity and a scaled Alvarez-type cavity, demonstrating its ability to perform rapid, reliable field measurements under various challenging conditions, including low signal-to-noise ratios and environmental vibrations. The results confirm the method's superiority in precision and operational efficiency, potentially setting a new standard for RF cavity diagnostics and tuning. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_01609 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Radio-frequency cavity field measurements through free falling bead Du, Xiaonan Groening, Lars Accelerator Physics Instrumentation and Detectors This paper introduces a novel bead-falling measurement method for the precise and efficient mapping of electromagnetic fields within radio-frequency (RF) cavities, which are crucial components in the design of accelerators. The traditional bead-pull method, while effective, involves mechanical complexities and is prone to errors from wire perturbations. The innovative method reported here leverages the simplicity and accuracy of free-falling beads to mitigate these issues. This technique eliminates the need for a wire-pulley system, thereby simplifying the experimental setup and reducing potential mechanical errors. We detail the development and operational principles of this new method, including the design of a compact, portable measurement device that integrates a bead/droplet release system and a bead detection system linked to a Vector Network Analyzer (VNA). The device has been tested with a three-gap buncher cavity and a scaled Alvarez-type cavity, demonstrating its ability to perform rapid, reliable field measurements under various challenging conditions, including low signal-to-noise ratios and environmental vibrations. The results confirm the method's superiority in precision and operational efficiency, potentially setting a new standard for RF cavity diagnostics and tuning. |
| title | Radio-frequency cavity field measurements through free falling bead |
| topic | Accelerator Physics Instrumentation and Detectors |
| url | https://arxiv.org/abs/2407.01609 |