Active high power switches based on Y–Ba2–Cu3–O7−δ thin films

Hiebl, A.; Heinrich, A.; Numssen, K.; Kinder, H.; Weck, W.; Muller, A.; Scholderle, H.

doi:10.1016/s0921-4534(02)01089-4

Cited by 1 publication

(2 citation statements)

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“…The total arrangement was immersed in liquid nitrogen and placed in a shielded environment. Further details about the setup can be found in [2]. Here we have investigated the influence of the direction of the RF field by using three different coil configurations.…”

Section: Methodsmentioning

confidence: 99%

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RF pulse triggered superconducting switches

Hiebl

Numssen²,

Kinder

et al. 2003

IEEE Trans. Appl. Supercond.

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In recent years, we have studied the possibility of using YBCO thin films not only for passive switching, as in resistive fault current limiters, but also as actively switchable devices at high power levels and millisecond time scales.As a trigger, we previously used heat pulses which were launched from the backside of the substrate. This requires relatively high trigger power, however. More recently, we have used RF pulses which are directly applied to the superconducting strip itself. The RF magnetic field was applied by various types of coils at frequencies in the MHz range. The samples were prepared by thermal co-evaporation on sapphire substrates in the form of strips with dimensions 10 mm 42 mm. They were submersed in liquid nitrogen and biased by a dc current. Simultaneously with the leading edge of the RF pulse, we observe the onset of a dc voltage drop along the superconductor which continues to increase during some milliseconds until the YBCO film eventually switches into the normal state. We have measured the switching time as a function of bias current, RF field direction, and RF power. The latter is considerably less than the heat pulse power required for our previous trigger method. The optimum field direction turned out to be perpendicular to the film.Index Terms-Active switch, fault current limiter, YBCO thin films.

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Section: Methodsmentioning

confidence: 99%

“…More recently we tried a new type of switch [2] where the trigger power is directly coupled into the superconductor itself by using the dissipation effect of an RF magnetic field applied to a superconductor in the mixed state [3]. It turned out that the trigger power can be reduced this way by more than one order of magnitude.…”

Section: Introductionmentioning

confidence: 99%