WEZAA3
Fermilab, Batavia, USA
THAP3
Fermilab, Batavia, USA
| Paper | Title | Page |
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WEZAA3 |
Advances in SRF Materials Science aimed at High Q Cavities | |
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| Several SRF accelerators worldwide target continuous wave operation at medium accelerating gradients. Examples include light sources, ERLs, Project X, accelerator driven systems and more. For these machines cryogenic losses dominate and therefore the quality factors of the SRF niobium cavities has a large impact on capital and operating costs. In this talk we will present the state of the art R&D in surface processing for maximization of quality factors in SRF niobium cavities, with consideration regarding different operating frequencies and temperature. | ||
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Slides WEZAA3 [9.636 MB] | |
THAP3 |
Field Dependent Losses in Superconducting Niobium Cavities | |
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| In this presentation I will report the investigation of superconducting properties of niobium samples via application of the muon spin rotation/relaxation (muSR) technique. We employ for the first time the muSR technique to study samples that are cutout from large and small grain 1.3 GHz radio frequency (RF) single cell niobium cavities. The RF test of these cavities was accompanied by full temperature mapping to characterize the RF losses in each of the samples. An interesting correlation is found between high field RF losses and field dependence of the sample magnetic volume fraction measured via muSR, suggesting an important role of magnetic flux motion and surface pinning in the high RF field cavity losses. | ||
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Slides THAP3 [3.630 MB] | |