Critical current in NbTi wires irradiated by neutrons at 20 K

Topchishvili, L.S.; Naskidashvili, A. I.

doi:10.1016/s0022-3115(98)00809-5

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B Q-value and Surface Resistance As A Function Of The Magne1

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2009

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“…The critical current density resulting from the fit is J C = 9300 A cm −2 T −1/2 , which agrees with the values given in Ref. 34.…”

Section: B Q-value and Surface Resistance As A Function Of The Magnesupporting

confidence: 90%

The quality factor of a superconducting rf resonator in a magnetic field

Ulmer¹,

Kracke²,

Blaum³

et al. 2009

Review of Scientific Instruments

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The quality factor of a superconducting NbTi resonator at 1.6 MHz in a magnetic field up to 1.2 T as well as its temperature dependence is investigated. A hysteresis effect in the superconducting surface resistance as a function of the magnetic field is observed. An unloaded Q-value of the resonator of 40,500 is achieved at 3.9 K. It is shown that this Q-value is limited by dielectric losses in the FORMVAR insulation of the coils wire. The details of the Q-value optimization are discussed. In the temperature dependence of the Q-value a steep decrease is observed above T approximately = 7.5 K. Finally, the implications of these measurements for real trap experiments are discussed in detail.

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“…The critical current density resulting from the fit is J C = 9300 A cm −2 T −1/2 , which agrees with the values given in Ref. 34.…”

Section: B Q-value and Surface Resistance As A Function Of The Magnesupporting

confidence: 90%