The Surface Treatment of Niobium Superconducting Reentrant Cavities by Means of High Temperature Nitrogen Plasma Based Ion Implantation
| Autor: | Rogério Moraes Oliveira, Renata Lopes Gonçalves de Souza, E. C. Ferreira, Odylio D. Aguiar, C.B. Mello, M. M. Silva, Graziela da Silva Savonov, V. Liccardo, Michel Felipe Lima de Araujo, Koumei Baba |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Superconductivity
gravitational wave detector plasma ion implantation Materials science Mechanical Engineering Niobium chemistry.chemical_element Plasma Condensed Matter Physics Nitrogen Molecular physics Ion Ion implantation chemistry Mechanics of Materials Duty cycle TA401-492 superconducting resonant cavities General Materials Science Materials of engineering and construction. Mechanics of materials Order of magnitude |
| Zdroj: | Materials Research, Vol 22, Iss 6 (2019) Materials Research v.22 n.6 2019 Materials research (São Carlos. Online) Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL |
| ISSN: | 1516-1439 |
| Popis: | High Temperature Nitrogen Plasma Based Ion Implantation (HT-NPBII) has been used to treat the surface of niobium superconducting reentrant cavities, which are part of parametric transducers in a resonant-mass gravitational wave detector. The aim is to enhance the corresponding electrical quality factors (Q-factors) which are closely related with the increase of the sensitivity of the system. In this experiment, the cavities are immersed in plasma and bombarded by energetic nitrogen ions, which are implanted into the surfaces of these heated substrates. The heating temperature of the cavities is controlled during the treatment and its level directly affects the N implantation depth profile due to the diffusion process. Additional tailoring of the nitrogen doping can be performed by the adjustment of the intensity and the duty cycle of the high negative voltage pulses used for ion implantation. For implantations performed at 5 kV /20 µs /300 Hz/ 700 °C, nitrogen atoms occupy interstitial spaces in the crystal lattice of niobium. The treatment of niobium superconducting cavities under these parameters caused the enhancement of two orders of magnitude of respective Q-factors. A set of characterization techniques was performed herein in order to help with the understanding of the underlying mechanism behind this phenomenon. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|