ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • American Institute of Physics (AIP)  (6)
  • 1
    Electronic Resource
    Electronic Resource
    rf surface resistance measurements of binary and ternary niobium compounds (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 257-264 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The superconducting properties of binary and ternary niobium compounds for rf applications are investigated. The materials under study are niobium nitride (NbN), niobium-titanium nitride (NbTiN), and niobium tin (Nb3Sn). Preparation techniques of the compounds are discussed. NbN and NbTiN are obtained by thermal reaction of bulk Nb in nitrogen atmosphere. Nb3Sn has been obtained using a technique originally developed for high-field magnet fabrication and modified to be applied to rf cavity production. The experimental apparatus and measurement technique are described. In particular the raw experimental data have been carefully analyzed to obtain important informations on fundamental material parameters. The effect of field penetration in the superconductor and the influence on the experimental results of the normal metallic substrate on which the superconductor is grown is also considered. The measurements show that NbN and Nb3Sn are effectively potentially good materials for rf applications due to their low theoretical BCS surface resistance. So far the results obtained with NbTiN are more difficult to interpret because the quality of the material did not allow sufficiently accurate collection of data. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359386
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    ac low-frequency magnetic measurement of the proximity effect between fine filaments of superconducting NbTi wires (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1873-1881 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic weak coupling between superconducting fine filaments of multifilamentary NbTi wires for high-energy-physics applications (dipole magnets for large hadron collider at CERN) is studied through ac magnetic measurements down to very low frequencies (0.5 Hz). The shielded and trapped magnetic fluxes are measured versus the temperature at fixed ac field superimposed on a constant dc field. The measured curves look like measurements on high-Tc superconductors with the characteristic two maximum values of the trapped magnetic flux. One of these two peaks can be related to the superconducting transition of NbTi filaments, the other one to the weak coupling between the filaments. The measurements of the field and the temperature dependence of the latter peak allow the critical current of the weak coupling versus the field to be calculated giving interesting information about the proximity effect in the superconducting-normal-superconducting array.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353174
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A simple digital system for ac magnetic measurements on superconductors (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 1796-1800 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This article describes a simple apparatus to perform ac inductive measurements on superconductors. The ac susceptibility, the penetrated and trapped magnetic flux and the magnetization of a sample placed in an ac magnetic field are measured by processing the signal induced in a pick-up coil that surrounds the sample. The complex harmonic analysis of the signal is also performed. The setup consists of an amplifier, a three-channel recorder, and a standard desktop computer. The main advantages of the apparatus are its simple design and low cost. Its main drawback is the noise affecting the signals. Tests were performed on a high Tc superconductor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142424
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    An experimental apparatus for the characterization of rf properties of superconducting samples near the transition temperature (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 2075-2081 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An experimental apparatus for accurate characterization of rf properties of superconducting samples near the transition temperature has been designed and realized. It is composed of a standard liquid helium cryostat equipped with a variable temperature insert. A feedback system allows temperature stabilization within 10−2 K around a chosen temperature. A simple, while exhaustive, thermodynamical model of the cryostat operation is presented together with the description of the temperature control system. The rf measurement technique is also presented with the first results obtained on a niobium sample used for calibration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144815
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Superconducting microwave undulator : INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1805-1808 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have studied the possibility of using a superconducting microwave cavity resonator as an undulator. A small cavity, made from bulk niobium, has been built and tested. The cavity has an elliptical cross section in order to force a linearly polarized oscillation mode. The TE118 mode has been chosen as the most suitable. Fields of about 300 G have been obtained with 10 W of microwave power. Fields up to 1 kG are reachable with niobium of higher thermal conductivity and better surface treatment. A circular cross-section cavity, where left- or right-handed helical fields can be excited, is also briefly studied. If used as an undulator this cavity produces circularly polarized radiation which can be switched in short times from left- to right-handed polarization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140908
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Study of niobium nitrides for superconducting rf cavities (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 5944-5949 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper deals with the first results of a study on Nb-N system having as the main goal the performance of niobium nitride rf cavities. The nitrides were obtained by diffusion of nitrogen in bulk niobium at high temperature. Metallurgical and resistive measurements have been done to determine the phases and the critical temperature of the samples. Furthermore, in order to study the rf behavior of the material, a 4.5-GHz niobium nitride cavity has been built and tested. The rf measurements showed, above 4 K, a surface resistance in good agreement with the computed values (1.15 μΩ at 4.2 K), i.e., about a factor of 10 better than the value obtained for niobium at the same temperature and frequency. At temperatures below 4 K, the residual resistance became prevalent, and its value was found to be 0.69 μΩ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343621
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...