英国物理学会
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作者:... A Grassellino , A Romanenko , J F Zasadzinski
来源:[J].Superconductor Science and Technology(IF 2.758), 2017, Vol.30 (3)IOP
摘要:In the present study the radio-frequency complex response of trapped vortices in superconductors is calculated and compared to experimental data previously published. The motion equation for a magnetic flux line is solved assuming a bi-dimensional and mean-free-path-dependent Lor...
作者:A Romanenko , Y Trenikhina ...
来源:[J].Superconductor Science and Technology(IF 2.758), 2017, Vol.30 (9)IOP
摘要:We report the finding of new surface treatments that permits one to manipulate the niobium resonator nitrogen content in the first few nanometers in a controlled way, and the resonator fundamental Mattis–Bardeen surface resistance and residual resistance accordingly. In part...
作者:A Romanenko , M Sardela ...
来源:[J].Superconductor Science and Technology(IF 2.758), 2018, Vol.31 (1)IOP
摘要:Nb3Sn has potential to become the material of choice for fabrication of SRF cavities. The higher critical temperature of Nb3Sn potentially allows for an increased operational temperature in SRF cavities, which could enable a simplification of the cryogenic s...
作者:A Lapin , A Romanenko
来源:[J].IOP Conference Series: Materials Science and Engineering, 2016, Vol.158 (1)IOP
摘要:The article deals with the optimal control problem with the parabolic equation as state problem. There are point-wise constraints on the state and control functions. The objective functional involves the observation given in the domain at each moment. The conditions for convergen...
作者:... Y Trenikhina , A Romanenko , F Fernandez-Alonso
来源:[J].Journal of Physics: Conference Series, 2018, Vol.1055 (1)IOP
摘要:Neutron Compton scattering and neutron diffraction have been applied to investigate the influence of nitrogen doping of niobium on the performance of superconducting radio-frequency niobium cavities. To this end, a comparative study of the neutronic response of two samples has be...
作者:A Romanenko , H Padamsee
来源:[J].Superconductor Science and Technology(IF 2.758), 2010, Vol.23 (4), pp.045008 (4pp)IOP
摘要:Quantitative analysis of the near-surface dislocation content performed using electronbackscattered diffraction for samples cut from niobium cavities limited by the 'high field Q -slope' effect show a high dislocation content, as well as a pronouncedchange in the near-surfac...
作者:A Romanenko , L V Goncharova
来源:[J].Superconductor Science and Technology(IF 2.758), 2011, Vol.24 (10), pp.105017 (5pp)IOP
摘要:Recent studies of the quality factor degradation mechanisms in superconducting RFniobium cavities at high surface magnetic fields revealed that RF performance may dependon the total hydrogen content in the 40 nm thick near-surface layer. Hydrogen distributionin niobium and i...
作者:A Romanenko , F Barkov ...
来源:[J].Superconductor Science and Technology(IF 2.758), 2013, Vol.26 (3)IOP
摘要:Many modern and proposed future particle accelerators rely on superconducting radio frequency cavities made of bulk niobium as primary particle accelerating structures. Such cavities suffer from the anomalous field dependence of their quality factors Q 0. High fie...
作者:A Dzyuba , A Romanenko , L D Cooley
来源:[J].Superconductor Science and Technology(IF 2.758), 2010, Vol.23 (12), pp.125011 (9pp)IOP
摘要:A model for the onset of the reduction in superconducting radio-frequency (SRF) cavity quality factor, theso-called Q -drop, at high accelerating electric fields is presented. Since magnetic fieldsat the cavity equator are tied to accelerating electric fields by a simplegeo...
作者:A Romanenko , D Sergatskov ...
来源:[J].Superconductor Science and Technology(IF 2.758), 2013, Vol.26 (10)IOP
摘要:We report a surface treatment that systematically improves the quality factor of niobium radio frequency cavities beyond the expected limit for niobium. A combination of annealing in a partial pressure of nitrogen or argon gas and subsequent electropolishing of the niobium cavity...

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