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.
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.
Footnotes
[1] doi:10.18429/JACoW-SRF2021-MOPCAV004
[2] doi:10.18429/JACoW-SRF2021-MOPCAV012
[3] doi:10.18429/JACoW-SRF2023-WEIXA04
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