Model for hot spots and Q-slope behavior in granular niobium thin film superconducting rf cavities
We propose a model to explain power dissipation leading to the formation of hot spots in the inner walls of niobium thin film superconducting rf cavities. The physical mechanism that we explore is due to the constriction of surface electrical current flow at grain interface boundaries. This constric...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2022-02-01
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| Series: | Physical Review Accelerators and Beams |
| Online Access: | http://doi.org/10.1103/PhysRevAccelBeams.25.022001 |
| _version_ | 1819326833482530816 |
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| author | Aymeric Ramiere Claire Z. Antoine Jay Amrit |
| author_facet | Aymeric Ramiere Claire Z. Antoine Jay Amrit |
| author_sort | Aymeric Ramiere |
| collection | DOAJ |
| description | We propose a model to explain power dissipation leading to the formation of hot spots in the inner walls of niobium thin film superconducting rf cavities. The physical mechanism that we explore is due to the constriction of surface electrical current flow at grain interface boundaries. This constriction creates an additional electrical contact resistance which induces localized punctual heat dissipation. The temperature at these spots is derived; and the electrical contact resistance is shown to depend on the magnetic field, on the grain contact size over which dissipation occurs, and on other key parameters, including the effective London penetration depth and the frequency. The surface resistance and the quality factors are determined using our model and are shown to be in excellent agreement with experimental data. |
| first_indexed | 2024-12-24T13:01:14Z |
| format | Article |
| id | doaj.art-9762cf8861ba4204952f16458dd2ce1f |
| institution | Directory Open Access Journal |
| issn | 2469-9888 |
| language | English |
| last_indexed | 2024-12-24T13:01:14Z |
| publishDate | 2022-02-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Accelerators and Beams |
| spelling | doaj.art-9762cf8861ba4204952f16458dd2ce1f2022-12-21T16:54:09ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882022-02-0125202200110.1103/PhysRevAccelBeams.25.022001Model for hot spots and Q-slope behavior in granular niobium thin film superconducting rf cavitiesAymeric RamiereClaire Z. AntoineJay AmritWe propose a model to explain power dissipation leading to the formation of hot spots in the inner walls of niobium thin film superconducting rf cavities. The physical mechanism that we explore is due to the constriction of surface electrical current flow at grain interface boundaries. This constriction creates an additional electrical contact resistance which induces localized punctual heat dissipation. The temperature at these spots is derived; and the electrical contact resistance is shown to depend on the magnetic field, on the grain contact size over which dissipation occurs, and on other key parameters, including the effective London penetration depth and the frequency. The surface resistance and the quality factors are determined using our model and are shown to be in excellent agreement with experimental data.http://doi.org/10.1103/PhysRevAccelBeams.25.022001 |
| spellingShingle | Aymeric Ramiere Claire Z. Antoine Jay Amrit Model for hot spots and Q-slope behavior in granular niobium thin film superconducting rf cavities Physical Review Accelerators and Beams |
| title | Model for hot spots and Q-slope behavior in granular niobium thin film superconducting rf cavities |
| title_full | Model for hot spots and Q-slope behavior in granular niobium thin film superconducting rf cavities |
| title_fullStr | Model for hot spots and Q-slope behavior in granular niobium thin film superconducting rf cavities |
| title_full_unstemmed | Model for hot spots and Q-slope behavior in granular niobium thin film superconducting rf cavities |
| title_short | Model for hot spots and Q-slope behavior in granular niobium thin film superconducting rf cavities |
| title_sort | model for hot spots and q slope behavior in granular niobium thin film superconducting rf cavities |
| url | http://doi.org/10.1103/PhysRevAccelBeams.25.022001 |
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