Passivated niobium cavities

Details Passivated niobium cavities Passivated niobium cavities

2006-12-19

2006-12-19

Dinh, Trinh Vo (Department: 2821)

Electric lamp and discharge devices: systems

High energy particle accelerator tube

C315S005410

Reexamination Certificate

active

07151347

ABSTRACT:
A niobium cavity exhibiting high quality factors at high gradients is provided by treating a niobium cavity through a process comprising: 1) removing surface oxides by plasma etching or a similar process; 2) removing hydrogen or other gases absorbed in the bulk niobium by high temperature treatment of the cavity under ultra high vacuum to achieve hydrogen outgassing; and 3) assuring the long term chemical stability of the niobium cavity by applying a passivating layer of a superconducting material having a superconducting transition temperature higher than niobium thereby reducing losses from electron (cooper pair) scattering in the near surface region of the interior of the niobium cavity. According to a preferred embodiment, the passivating layer comprises niobium nitride (NbN) applied by reactive sputtering.

REFERENCES:
patent: 3784452 (1974-01-01), Martens et al.
patent: 3939053 (1976-02-01), Diepers et al.
patent: 4014765 (1977-03-01), Roth et al.
patent: 4072588 (1978-02-01), Diepers
patent: 5306406 (1994-04-01), Palmieri et al.
patent: 6097153 (2000-08-01), Brawley et al.

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