The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
| Title | Theoretical Field Limit and Cavity Surface Conditions: Nano-Scale Topography and Sub-millimeter Pit | |||||
| Authors |
|
|||||
| Abstract | The recent two theoretical papers*,** are briefly introduced. The former addresses the superheating field (Bs) suppression due to nano-defects distributing almost continuously on the cavity surface*. We introduce a model of the nano-defect. An analytical formula for Bs suppression factor is derived. By using the formula, suppression factors of bulk or multilayer superconductors and those after various surface processing technologies can be evaluated. An application to the dirty Nb processed by EP is also presented as an example. The latter address the magnetic field enhancement (MFE) at the sub-millimeter pit on the surface of cavity, which is thought to cause quench**. There exists the famous well-type pit model, but many of pits are not well-type but have gentle slopes. Impacts of the slope angle on MFE have not been well understood. We introduce a model that can describe a pit with an arbitrary slope angle. A formula to evaluate the MFE factor is derived. A pit with a gentle slope angle yields a much smaller MFE factor than the well-type pit. The formula can be applied to the calculation of MFE factors of real pits with arbitrary slope angles. | |||||
| Footnotes & References | * T. Kubo, Prog. Theor. Exp. Phys. 2015,063G01(2015). ** T. Kubo, Prog. Theor. Exp. Phys. 2015,073G01(2015). |
|||||
| Paper | download MOPB008.PDF [0.934 MB / 4 pages] | |||||
| Conference | SRF2015, Whistler, BC, Canada | |||||
| Series | International Conference on RF Superconductivity (17th) | |||||
| Proceedings | Link to full SRF2015 Proccedings | |||||
| Session | Poster Session | |||||
| Date | 14-Sep-15 14:20–17:30 | |||||
| Main Classification | Fundamental SRF R&D - Bulk Nb | |||||
| Keywords | cavity, factory, simulation, radio-frequency, framework | |||||
| Publisher | JACoW, Geneva, Switzerland | |||||
| Editors | Robert E. Laxdal (TRIUMF, Vancouver, BC, Canada); Jana Thomson (TRIUMF, Vancouver, BC, Canada); Volker RW Schaa (GSI, Darmstadt, Germany) | |||||
| ISBN | 978-3-95450-178-6 | |||||
| Published | December 2015 | |||||
| Copyright |
|
