|MOP024||Vacancy-Hydrogen Dynamics in Samples During Low Temperature Baking||83|
Funding: This work was supported by the Helmholtz Association within the topic Accelerator Research and Development (ARD) of the Matter and Technologies (MT) Program and by the BMBF under the research grant 05H18GURB1.
The recent discovery of a modified low temperature baking process lead to a reduction of surface losses and an increase of the accelerating gradient of TESLA shape cavities. The hypothesis linking the accelerator performance and the treatment is the suppression of lossy nanohydrides via defect trapping, with vacancy-hydrogen complexes forming at the lower temperatures. Utilizing Doppler broadening Positron Annihilation Spectroscopy and Positron Annihilation Lifetime Spectroscopy samples made from European XFEL niobium sheets and cavity cut-outs were investigated. The evolution of vacancies, hydrogen and their interaction at different temperature levels have been studied during in-situ annealing. Measurements of niobium samples and a correlation between RF, material properties, and V-H distribution in cavity cut-outs has been done.
|Poster MOP024 [1.087 MB]|
|DOI •||reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-MOP024|
|About •||paper received ※ 20 June 2019 paper accepted ※ 30 June 2019 issue date ※ 14 August 2019|
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