A new method to measure the unloaded quality factor of superconducting cavities
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arXiv
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866910376975663104 |
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| author | Ziemann, Volker |
| author_facet | Ziemann, Volker |
| contents | We describe an method that measures the unloaded quality factor $Q_0$, the external quality factor $Q_E$, and the cavity detuning $Δω$ with a recursive least-squares algorithm. It combines a large number of consecutive measurements to successively improve an estimate of fit parameters that asymptotically converges to the ``real'' values. Exploiting the large amount of data acquired by a digital low-level RF system permits us to reach this asymptotic regime in a moderate time frame of seconds to minutes. Simulations show that the method works both for critically coupled and over-coupled cavities. A new calibration method adresses very tight tolerances of the method on system parameters. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_17548 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | A new method to measure the unloaded quality factor of superconducting cavities Ziemann, Volker Accelerator Physics We describe an method that measures the unloaded quality factor $Q_0$, the external quality factor $Q_E$, and the cavity detuning $Δω$ with a recursive least-squares algorithm. It combines a large number of consecutive measurements to successively improve an estimate of fit parameters that asymptotically converges to the ``real'' values. Exploiting the large amount of data acquired by a digital low-level RF system permits us to reach this asymptotic regime in a moderate time frame of seconds to minutes. Simulations show that the method works both for critically coupled and over-coupled cavities. A new calibration method adresses very tight tolerances of the method on system parameters. |
| title | A new method to measure the unloaded quality factor of superconducting cavities |
| topic | Accelerator Physics |
| url | https://arxiv.org/abs/2312.17548 |