Performance-defining properties of Nb3Sn coating in SRF cavities
| Autor: | Daniel Hall, Mauro R. Sardela, Matthias Liepe, Jian-Min Zuo, Sam Posen, Y. Trenikhina, Alexander Romanenko |
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| Rok vydání: | 2017 |
| Předmět: |
Accelerator Physics (physics.acc-ph)
Fabrication Materials science Cryogenic system FOS: Physical sciences engineering.material 01 natural sciences Coating 0103 physical sciences Materials Chemistry Figure of merit Electrical and Electronic Engineering 010306 general physics 010302 applied physics business.industry Metals and Alloys Dissipation Condensed Matter Physics Operation temperature Characterization (materials science) Rf testing Ceramics and Composites engineering Optoelectronics Physics - Accelerator Physics business |
| Zdroj: | Superconductor Science and Technology. 31:015004 |
| ISSN: | 1361-6668 0953-2048 |
| DOI: | 10.1088/1361-6668/aa9694 |
| Popis: | Nb$_3$Sn has great potential to become the material of choice for fabrication of SRF cavities. The higher critical temperature of Nb$_3$Sn potentially allows for an increased operational temperature in SRF cavities, which could enable tremendous simplification of cryogenic system, leading to significant cost reduction. We present extended characterization of a Nb$_3$Sn coated Nb cavity prepared at Cornell University. Using combination of thermometry during cavity RF measurements, and structural and analytical characterization of the cavity cutouts, we discover Nb$_3$Sn coating flaws responsible for the poor cavity performance. Our results clearly show degraded material quality in the cavity cutouts which exhibit significant heating during the RF testing. Results of extended comparison of cavity cutouts with different dissipation profiles not only point out the cause of significant Q-slope but also establish figures of merit for material qualities in relation to the quality of SRF performance. |
| Databáze: | OpenAIRE |
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