Subnanosecond time response of large-area superconducting stripline detectors for keV molecular ions

Casaburi, A.; Zen, Nobuyuki; Suzuki, Kôji; Ejrnæs, M.; Pagano, S.; Cristiano, R.; Ohkubo, M.

doi:10.1063/1.3142419

Cited by 33 publications

(32 citation statements)

References 14 publications

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“…To investigate further this point, we now do the hypothesis that vortices nucleate and cross the hit strip as figured out by the model of SNSPD detection mechanism [23]. The current density flowing in the struck strip lowers the unbinding energy, U(J), for a vortex-antivortex pair at a level comparable to that of a single photon at wavelength of 1550 nm: E photon~ 0.8 eV > U(J).…”

Section: Theoretical Model and Discussionmentioning

confidence: 99%

“…Superconducting strip have been also used in the detection of biological macromolecules for application in time-of-flight mass spectrometry [23][24][25]. Here, the evidence is for a detection mechanism where the output pulses are generated through the "hot-spot" formed by high-energy phonons produced when the molecules impact the strip [26,27].…”

Section: Introductionmentioning

confidence: 99%

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Experimental evidence of photoinduced vortex crossing in current carrying superconducting strips

et al. 2015

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We report an experimental investigation that shows how magnetic vortices are generated and cross a currentcarrying superconducting strip when illuminated by a bright (~MeV) and fast (<500 ps duration) infrared light pulse. The work has been carried out using a strike-and-probe electro-optic technique on a device consisting of a parallel superconducting strip configuration, with wide spacing between the strips to allow the interaction of the photons with single strip. We find that photons hitting one strip induce a collective current redistribution in the parallel strips, which we can quantitatively account for in the framework of the London model by including the effect of generated and trapped magnetic vortices in the superconducting loops formed by the two adjacent slots. The amount of trapped vorticity and its dependence on increasing current density flowing in the illuminated strip is in good agreement with the photon-assisted unbinding of vortex-antivortex pairs. This work allows us to gain a deeper understanding of the interaction between photons and current-carrying superconducting strips.

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Section: Theoretical Model and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental evidence of photoinduced vortex crossing in current carrying superconducting strips

et al. 2015

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“…However, because the strip-line cross section is large, the overall bias current is $mA, thus the current diverted to the load (lA) is sufficient to register well distinguished pulses with a high signal-to-noise ratio. 4,7 In this regime, the strip-line does not recover its bias current after switching and the bias current is redistributed between the remaining superconducting strips. 10 This leads to variations in the efficiency during free running operation 4 and a spread in the pulse amplitude distribution.…”

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confidence: 99%

“…5 Therefore, a "parallel" strip-line configuration is adopted to increase the coverage area whilst retaining an ultra-fast response. 6,7 This simple idea allows precise control of the kinetic inductance of stripline elements, leading to the realization of an SSLD with a sensitive area up to 2 Â 2 mm 2 with a sub-nanosecond response time. 4 In these large area SSLDs, a relatively low ratio of bias current to critical current (I B /I C < 55%) is required to prevent device latching.…”

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confidence: 99%

Current distribution in a parallel configuration superconducting strip-line detector

Casaburi

Heath

Tanner

et al. 2013

Applied Physics Letters

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Superconducting detectors based on parallel microscopic strip-lines are promising candidates for single molecule detection in time-of-flight mass spectrometry. The device physics of this configuration is complex. In this letter, we employ nano-optical techniques to study the variation of current density, count rate, and pulse amplitude transversely across the parallel strip device. Using the phenomenological London theory, we are able to correlate our results to a non-uniform current distribution between the strips, governed by the London magnetic penetration depth. This fresh perspective convincingly explains anomalous behaviour in large area parallel superconducting strip-line detectors reported in previous studies.

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“…[45][46] This regime was observed in parallel-SSPDs with large nano-strips cross-sections that carry such a high current which was sufficient to produce a voltage signal across the load resistance with an amplitude well above the noise level. Cascade and single-strip-switch regimes will be described in Sections 4.1.1 and 4.1.2.…”

Section: Working Regimesmentioning

confidence: 99%

Superconducting nano-strip particle detectors

Cristiano

Ejrnæs

Casaburi

et al. 2015

Supercond. Sci. Technol.

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We review progress in the development and applications of superconducting nano-strip particle detectors. Particle detectors based on superconducting nano-strips stem from the parent devices developed for single-photon detection (SSPD) and share with them ultrafast response time (sub-nanosecond) and operation at a relatively high temperature (2 -5 K) with respect to other cryogenic detectors. SSPDs have been used in the detection of electrons, neutral and charged ions, and biological macromolecules. Nevertheless, the development of superconducting nano-strip particle detectors has been mainly driven by the use in time-of-flight mass spectrometers (TOF-MS) where the goal of 100% efficiency at large mass values can be obtained. A special emphasis will be given to this case, reporting the great progress achieved which permits to overcome the limitations of existing mass spectrometers represented by low detection efficiency at large masses and charge/mass ambiguity and could represent a breakthrough in the field. In this review article we will introduce the device concept and detection principle, stressing the peculiarities of the nano-strip particle detector as well as its similarities with the photon detector. The development of the parallel strip configuration is introduced and extensively discussed, since it has contributed to significant progress in TOF-MS applications.

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Subnanosecond time response of large-area superconducting stripline detectors for keV molecular ions

Cited by 33 publications

References 14 publications

Experimental evidence of photoinduced vortex crossing in current carrying superconducting strips

Experimental evidence of photoinduced vortex crossing in current carrying superconducting strips

Current distribution in a parallel configuration superconducting strip-line detector

Superconducting nano-strip particle detectors

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