Impact of heat treatments on the performance of low-frequency superconducting quarter-wave resonators at 4.3 K
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866915824540844032 |
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| author | Brown, Jacob Kim, Sang-hoon Hartung, Walter Xu, Ting |
| author_facet | Brown, Jacob Kim, Sang-hoon Hartung, Walter Xu, Ting |
| contents | We applied heat treatments to 80.5 MHz quarter-wave resonators made from bulk niobium and prepared with buffered chemical polishing BCP. We evaluated their performance at 4.3 K. We found that a 48 hour, 120 C bake-out ("low-temperature bake out") reduces the surface resistance by a factor of 2 to 3, stemming from a reduction in the Bardeen-Cooper-Schrieffer contribution, consistent with previous findings. This decrease leads to a 38% decrease on average in the medium-field Q-slope when compared to cavities which had only BCP. Mechanisms for the change in quality factor with low-temperature baking have been explored. We observed no improvement in cavity performance after a 3-hour bake-out at 350 C ("medium-temperature bake out"), in contrast to observations for higher-frequency cavities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_00388 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Impact of heat treatments on the performance of low-frequency superconducting quarter-wave resonators at 4.3 K Brown, Jacob Kim, Sang-hoon Hartung, Walter Xu, Ting Accelerator Physics We applied heat treatments to 80.5 MHz quarter-wave resonators made from bulk niobium and prepared with buffered chemical polishing BCP. We evaluated their performance at 4.3 K. We found that a 48 hour, 120 C bake-out ("low-temperature bake out") reduces the surface resistance by a factor of 2 to 3, stemming from a reduction in the Bardeen-Cooper-Schrieffer contribution, consistent with previous findings. This decrease leads to a 38% decrease on average in the medium-field Q-slope when compared to cavities which had only BCP. Mechanisms for the change in quality factor with low-temperature baking have been explored. We observed no improvement in cavity performance after a 3-hour bake-out at 350 C ("medium-temperature bake out"), in contrast to observations for higher-frequency cavities. |
| title | Impact of heat treatments on the performance of low-frequency superconducting quarter-wave resonators at 4.3 K |
| topic | Accelerator Physics |
| url | https://arxiv.org/abs/2603.00388 |