| Article | |
| Title | Numerical Calibration of the Bead-Pull Setup for Beam Coupling Impedance Evaluation |
| Author(s) | El Dali, Dalia Mahmoud Fouda (CERN) ; De Michele, Giovanni (ADAM, Geneva) ; Fanella, Stefano (ADAM, Geneva) ; Métral, Elias (CERN) ; Zannini, Carlo (CERN) |
| Publication | 2022 |
| Number of pages | 3 |
| In: | JACoW IPAC 2022 (2022) 607-609 |
| In: | 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.607-609 |
| DOI | 10.18429/JACoW-IPAC2022-MOPOTK062 |
| Subject category | Accelerators and Storage Rings |
| Abstract | The bead-pull method is a commonly used electromagnetic field measurement technique exploited to tune a radiofrequency cavity to achieve design specifications. The frequency of a resonant cavity is perturbed by inserting a metallic or dielectric bead. For a given electromagnetic field, the amplitude of the perturbation depends only on the geometry of the perturbing object. Therefore, the calibration of the bead can be done in different resonant structures without loss of generality. In this paper, a method to perform an accurate calibration of the bead with electromagnetic simulations is proposed. Compared to the common practice of measuring a reference cavity, the flexibility given by the simulation method to study different bead shapes and sizes could be advantageous to optimize the measurement setup. A calibrated bead-pull setup allows to quantify the electric field and, therefore, the shunt impedance of the resonant modes of the cavity. As experimental benchmark, the beam coupling impedance measured with the calibrated bead-pull setup is compared with electromagnetic simulations. |
| Copyright/License | CC-BY-3.0 |
Corresponding record in: Inspire
Journalen skapades 2023-01-11, och modifierades senast 2023-01-11
