Speaker
Description
Within the ITN (ILC Technology Network) activity led by KEK, the so-called "Medium Grain Niobium" is investigated with respect to its possible application for a large-scale SRF cavity production for the International Linear Collider ILC [1-3]. In the framework of the KEK-DESY collaboration, the niobium material for two 1.3 GHz single-cell cavities was supplied by KEK. After fabrication and initial surface treatment by electropolishing in industry, the cavities have been tested successfully at DESY with gradients above 40 MV/m. Subsequently, a heat treatment at medium temperatures around 350 °C (Mid-T heat treatment) in the DESY furnace was applied. The vertical test results of these treatments will be reported. In addition, the effect of UHV heat treatments on state-of-the-art fine grain niobium at temperatures between 800 °C and 1100 °C has been studied on samples with respect to grain growth, mechanical and thermal properties.
Footnotes
[1] doi:10.18429/JACoW-SRF2021-MOPCAV004
[2] doi:10.18429/JACoW-SRF2021-MOPCAV012
[3] doi:10.18429/JACoW-SRF2023-WEIXA04
Funding Agency
This work was supported by the Helmholtz Association within the topic Accelerator research and Development (ARD) of the Matter and Technologies (MT) Program.
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