STI Publications - View Publication Form #17090
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Publication Information
| Title | MAGNETIC FLUX EXPULSION IN SUPERCONDUCTING RADIO-FREQUENCY NIOBIUM CAVITIES MADE FROM COLD WORKED NIOBIUM | ||||
| Abstract | Trapped residual magnetic field during the cooldown of superconducting radio frequency (SRF) cavities is one of the primary source of rf residual losses leading to lower quality factor. Historically, SRF cavities have been fabricated from high purity fine grain niobium with grain size 50-100 ?m as well as large grain with grain size of the order of few centimeter. Non-uniform recrystallization of fine-grain Nb cavities after the post fabrication heat treatment leads to higher flux trapping during the cooldown, and hence the lower quality factor. We fabricated two 1.3 GHz single cell cavities from cold-worked niobium from different vendors and processed along with cavities made from SRF grade Nb. The flux expulsion and flux trapping sensitivity were measured after successive heat treatments in the range 800 ? 1000 ?C. The flux expulsion from cold-worked fine-grain Nb cavities improves after 800?C/3hrs heat treatments and it becomes similar to that of standard fine-grain Nb c | ||||
| Author(s) | Bashu Dev khanal, Pashupati Dhakal, Peter Lee, Santosh Chetri | ||||
| Publication Date | August 2022 | ||||
| Category | SRF Technology | ||||
| Document Type | Meeting, Proceedings | ||||
| Primary Institution | Thomas Jefferson National Accelerator Facility, Newport News | ||||
| Affiliation | Accelerator Ops, R&D / Inst for SRF Sci & Tech / SRF Research & Dev | ||||
| Funding Source | Nuclear Physics (NP), Additional Funcing form accelerator Stewardship | ||||
| Proprietary? | No | ||||
| This publication conveys | Technical Science Results | ||||
| Document Numbers |
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| Associated with an experiment | No | ||||
| Associated with EIC | No | ||||
| Supported by Jefferson Lab LDRD Funding | No |
Meeting / Conference
| Meeting Name | NAPAC2022 (2022 North American Particle Accelerator Conference) |
| Meeting Date | 8/7/2022 |
| Document Subtype | Paper (proceedings only) |
Proceedings
| Title | NAPAC2022 |
| Editor(s) | Sandra Biedron, Evgenya Simakov, Stephen Milton, Petr M. Anisimov, Volker RW Schaa |
| Publisher | JACOW |
| Refereed | No |
| Page Number | 611-614 |
| Year | 2022 |
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