Mainz 2022 – scientific programme
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 8: Radiofrequency Systems 2 – Superconductivity
AKBP 8.2: Talk
Tuesday, March 29, 2022, 16:15–16:30, AKBP-H14
Nitric soaking after furnace treatments to remove Niobium carbides — •Rezvan Ghanbari1,2, Marc Wenskat1,2, Wolfgang Hillert1,2, and Detlef Reschke2 — 1Institute of Experimental Physics, University of Hamburg, Hamburg, Germany — 2Deutsches Elektronen-Synchrotron, Hamburg, Germany
Annealings of niobium cavities in UHV or nitrogen atmospheres are crucial for the performance in the later cryogenic tests and operation. Recovery methods for imperfect annealing conditions have been discussed, and a more recent proposal, the so-called "nitric soak" has been studied in detail. It shows surprising recovery potential, albeit the unclear origin of this improvement. We present our investigation on the potential origins, prove the rejection of the favored one, and propose an alternative origin.