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Probst, P.; Semenov, A.; Ries, Markus; Hoehl, Arne; Rieger, Peter; Scheuring, A.; Judin, V.; Wünsch, Stefan; Ilin, K.; Smale, N.; Mathis, Yves‐Laurent; Müller, Ralph H.; Ulm, G.; Wüstefeld, G.; Hübers, H.-W.; Hänisch, Jens; Holzäpfel, B.; Siegel, M.; Müller, Anke-Susanne

doi:10.1103/physrevb.85.174511

Cited by 26 publications

(30 citation statements)

References 26 publications

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“…9 in Ref. [16]). If the pulse is asymmetric (the amplitude of the current of one sign is much larger than the amplitude of the current of the opposite sign), then the sign of the voltage response is determined by the largest current in the pulse.…”

Section: Discussionmentioning

confidence: 91%

“…Our interest in this problem arises from recent work [16] where the voltage response of the superconducting YBCO bridge on a short pulse of synchrotron radiation (with a duration of several picoseconds) was experimentally observed even in the absence of dc current. Due to the absence of a bolometric origin of the resistive response authors supposed that the electric field of the electromagnetic radiation accelerates the superconducting electrons and when the radiation induced current exceeds the critical current a finite voltage appears in the bridge.…”

Section: Dynamic Response On An Alternating Current Pulsementioning

confidence: 99%

“…Our interest in this problem arises from a recent experiment where the nonzero time-averaged voltage response of a wide yttrium barium copper oxide (YBCO) superconducting bridge to a short pulse of synchrotron radiation was observed [16]. This experiment demonstrates the possibility to study the resistive response of the superconducting bridge on a very short time scale (approximately several picoseconds) when the superconductor cannot be substantially heated and which is hard to realize by other methods.…”

Section: Introductionmentioning

confidence: 99%

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Temporary cooling of quasiparticles and delay in voltage response of superconducting bridges after abruptly switching on the supercritical current

Vodolazov

Peeters

2014

Phys. Rev. B

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We revisit the problem of the dynamic response of a superconducting bridge after abruptly switching on the supercritical current. In contrast to previous theoretical works we take into account spatial gradients and use both the local temperature approach and the kinetic equation for the distribution function of quasiparticles. We find that the temperature dependence of the finite delay time t d in the voltage response is model dependent and relatively large t d is connected with temporary cooling of quasiparticles during decay of superconducting order parameter | | in time. It turns out that the presence of even small inhomogeneities in the bridge or finite length of the homogenous bridge favors a local suppression of | | during the dynamic response. It results in a decrease of the delay time, in comparison with the spatially uniform model, due to the diffusion of nonequilibrium quasiparticles from the region with locally suppressed | |. In the case when the current density is maximal near the edge of a not very wide bridge the delay time is mainly connected with the time needed for the nucleation (entrance) of the first vortex and t d could be tuned by a weak external magnetic field. We also find that a short alternating current pulse (sinusoidlike) with zero time average may result in a nonzero time-averaged voltage response where its sign depends on the phase of the ac current.

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Section: Discussionmentioning

confidence: 91%

Section: Dynamic Response On An Alternating Current Pulsementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temporary cooling of quasiparticles and delay in voltage response of superconducting bridges after abruptly switching on the supercritical current

Vodolazov

Peeters

2014

Phys. Rev. B

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“…In this Letter, we demonstrate the possibility to monitor the microstructure dynamics in real time (turn-by-turn), when the electron bunch duration exceeds several tens of picoseconds, using a new generation of ultrafast detectors based on thin films of the high-temperature superconductor YBa 2 Cu 3 O 7−x (YBCO) [12][13][14]. Indeed, the temporal resolution of these detectors is only limited by the bandwidth of readout electronics and oscilloscope speed (16 ps FWHM here), and thus allows us to record details of the emitted CSR pulses.…”

mentioning

confidence: 99%

“…At the output port of the BL6B THz beam line [16,17], we placed the thin-film YBCO detector, described in detail in Refs. [12][13][14]. It was operated at liquid nitrogen temperature without any bias.…”

mentioning

confidence: 99%

Microbunching Instability in Relativistic Electron Bunches: Direct Observations of the Microstructures Using Ultrafast YBCO Detectors

et al. 2014

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Relativistic electron bunches circulating in accelerators are subjected to a dynamical instability leading to microstructures at millimeter to centimeter scale. Although this is a well-known fact, direct experimental observations of the structures, or the field that they emit, remained up to now an open problem. Here, we report the direct, shot-by-shot, time-resolved recording of the shapes (including envelope and carrier) of the pulses of coherent synchrotron radiation that are emitted, and that are a "signature" of the electron bunch microstructure. The experiments are performed on the UVSOR-III storage ring, using electrical field sensitive YBa2Cu3O(7-x) thin-film ultrafast detectors. The observed patterns are subjected to permanent drifts, that can be explained from a reasoning in phase space, using macroparticle simulations.

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