Unprecedented quality factors at accelerating gradients up to 45 MVm−1in niobium superconducting resonators via low temperature nitrogen infusion
| Autor: | A. C. Crawford, Oleksandr Melnychuk, Dmitri Sergatskov, Sam Posen, Mattia Checchin, Saravan Kumar Chandrasekaran, Damon Bice, Alexander Romanenko, Y. Trenikhina, Anna Grassellino, Sebastian Aderhold, Martina Martinello |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
business.industry Superconducting radio frequency Metals and Alloys Niobium chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Nitrogen Resonator Quality (physics) chemistry Impurity 0103 physical sciences Materials Chemistry Ceramics and Composites Optoelectronics Nanometre Electrical and Electronic Engineering 010306 general physics 0210 nano-technology business Sheet resistance |
| Zdroj: | Superconductor Science and Technology. 30:094004 |
| ISSN: | 1361-6668 0953-2048 |
| DOI: | 10.1088/1361-6668/aa7afe |
| Popis: | We report the finding of new surface treatments that permit to manipulate the niobium resonator nitrogen content in the first few nanometers in a controlled way, and the resonator fundamental Mattis-Bardeen surface resistance and residual resistance accordingly. In particular, we find surface infusion conditions that systematically a) increase the quality factor of these 1.3 GHz superconducting radio frequency (SRF) bulk niobium resonators, up to very high gradients; b) increase the achievable accelerating gradient of the cavity compared to its own baseline with state-of-the-art surface processing. Cavities subject to the new surface process have larger than two times the state of the art Q at 2K for accelerating fields > 35 MV/m. Moreover, very high accelerating gradients ~ 45 MV/m are repeatedly reached, which correspond to peak magnetic surface fields of 190 mT, among the highest measured for bulk niobium cavities. These findings open the opportunity to tailor the surface impurity content distribution to maximize performance in Q and gradients, and have therefore very important implications on future performance and cost of SRF based accelerators. They also help deepen the understanding of the physics of the RF niobium cavity surface. |
| Databáze: | OpenAIRE |
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