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      The Surface Treatment of Niobium Superconducting Reentrant Cavities by Means of High Temperature Nitrogen Plasma Based Ion Implantation

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          Abstract

          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.

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          Nitrogen and argon doping of niobium for superconducting radio frequency cavities: a pathway to highly efficient accelerating structures

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            From plasma immersion ion implantation to deposition: a historical perspective on principles and trends

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              Effect of high temperature heat treatments on the quality factor of a large-grain superconducting radio-frequency niobium cavity

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                mr
                Materials Research
                Mat. Res.
                ABM, ABC, ABPol (São Carlos, SP, Brazil )
                1516-1439
                1980-5373
                2019
                : 22
                : 6
                : e20190277
                Affiliations
                [3] Tsunashima-Higashi orgnameSanno Co., Ltda Japan
                [1] São José dos Campos São Paulo orgnameInstituto Nacional de Pesquisas Espaciais Brazil
                [2] São José dos Campos São Paulo orgnameInstituto Tecnológico de Aeronáutica Brazil
                Article
                S1516-14392019000600207 S1516-1439(19)02200600207
                10.1590/1980-5373-mr-2019-0277
                232f7e1b-6afb-478e-af23-5c5caeb4a769

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 28 October 2019
                : 02 April 2019
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 35, Pages: 0
                Product

                SciELO Brazil

                Categories
                Articles

                Niobium,superconducting resonant cavities,plasma ion implantation,gravitational wave detector

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