Complete Fabrication of a Traversable 3 µm Thick NbN Film Superconducting Coil with Cu plated layer of 42m in Length in a Spiral Three-Storied Trench Engraved in a Si Wafer of 76.2 mm in Diameter Formed by MEMS Technology for a Compact SMES with High Energy Storage Volume Density

Suzuki, Yasuhiro; Iguchi, Nobuhiro; Adachi, Kazuhiro; Ichiki, Akihisa; Hioki, Tatsumi; Hsu, Che-Wei; Sato, Ryoto; Kumagai, Shinya; Sasaki, Masahide; Noh, Joo–Hyong; Sakurahara, Y.; Okabe, Kyohei; Takai, Osamu; Honma, Hideo; Watanabe, Hideo; Sakoda, Hitoshi; Sasagawa, Hiroaki; Doy, Hideyuki; Zhou, Shuliang; Hori, Hisashi; Nishikawa, S.; Nozaki, Toshihiro; Sugimoto, Noriaki; Tagaya, Motohiro

doi:10.1088/1742-6596/897/1/012019

Cited by 9 publications

(6 citation statements)

References 2 publications

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“…The measurement of the current-voltage characteristics in cryogenic temperatures together with the measurement of magnetic field by a gauss meter showed an energy storage of 0.01 mJ [20]. Increasing the NbN thickness by mitigating the film stress [23], the stored energy increased up to 0.1 mJ [24]. Here, the experimentally obtained j c of NbN-1100 A/mm 2 -was used [19].…”

Section: Experimental Proof Of Concept Using Superconducting Nbn Thin Filmsmentioning

confidence: 79%

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Estimation of the Electricity Storage Volume Density of Compact SMESs of a New Concept Based on Si Microfabrication Technologies

et al. 2021

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A compact superconducting magnetic energy storage system (SMES) produced by Si micro fabrication technologies has been proposed to improve electricity storage volume density, w, in the sub-Wh/L range of conventional SMESs and to produce them at a low cost by mass production. In parallel with the experimental development reported previously, a series of trials was performed to estimate a feasible value of w based on the calculation of the magnetic field generated by the compact SMES by improving the calculation models step by step. In this work, the experimentally obtained magnetic flux density dependence of superconductive critical current density was taken into consideration for the first time in this series of trials, together with the additional improvement of the calculation models. The results of the estimation indicated that a compact SMES produced by the proposed concept can attain a w in the Wh/L range or more, ranking with or surpassing that of presently used capacitors.

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Section: Experimental Proof Of Concept Using Superconducting Nbn Thin Filmsmentioning

confidence: 79%

“…Here, the experimentally obtained j c of NbN-1100 A/mm 2 -was used [19]. The largest S near the central axis of the coil unit, S max , estimated from the magnetic flux density B along the central axis of a single-layer solenoid was 0.11 GPa, which was well below σ Si /3 [20,24].…”

Section: Experimental Proof Of Concept Using Superconducting Nbn Thin Filmsmentioning

confidence: 99%

Estimation of the Electricity Storage Volume Density of Compact SMESs of a New Concept Based on Si Microfabrication Technologies

et al. 2021

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“…Если образцы первого типа используются обычно в качестве детекторов [1,2], и уменьшение размеров здесь напрямую связано с увеличением чувствительности, то вторая группа часто применяется в сильноточной технике, где и необходимо учитывать нагревание токонесущих элементов. Применение широких и относительно толстых пленок возможно в сверхпроводящих магнитах и накопителях энергии, которые исследуются сейчас в качестве альтернативы аккумуляторам [3][4][5].…”

Section: Introductionunclassified

Моделирование Процесса Теплоотдачи Сверхпроводящих Пленок В Резистивном Состоянии

Васютин¹,

Kuz’michev²,

Shilkin³

2021

Журнал Технической Физики

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The analysis of heat transfer in the contact-film-substrate system under conditions when the heat removal from the sample to the substrate is insufficient to ensure that the sample is not overheated. For low temperatures, a method is proposed for increasing the heat removal from thin-film samples by passing a high-density electric current through them. The property of an anomalously high thermal conductivity of copper at temperatures from 5 to 50 K was used as the main factor in enhancing heat removal. The heat equation for the film-substrate system was numerically solved under the condition of additional heat transfer to potential contacts. It has been shown that beryllium bronze contacts can provide efficient heat removal from samples of superconducting films in a resistive state under conditions of strong Joule heat release.

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“…Тонкие плёнки из NbN используются в качестве однофотонных детекторов (superconducting single-photon detectors, SSPDs) [2]. Широкие и относительно толстые плёнки используются в сверхпроводящих магнитах и накопителях энергии [3].…”

Section: Introductionunclassified

Mathematical modeling of heat transfer in the film-substrate-thermostat system during heating of an electrically conductive film by a high-density pulse current

et al. 2021

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Mathematical modeling of heat transfer in the film-substrate-thermostat system with a pulsed flow of high-density current through an electrically conductive film has been carried out. On the basis of the simulation, the analysis of the heating of a niobium nitride film with a high resistivity near the critical temperature of the transition to the superconducting state is made. The inhomogeneous heat conduction equation which is solved numerically, simulates heat transfer in the film-substrate-thermostat system for the third on the left and the first on the right initial boundary value problem. Using the symmetry of the problem, the parameter H is determined, which is equal to the ratio of the heat transfer of the film surface to its thermal conductivity; this parameter is necessary for effective heat removal. It is shown that effective heat removal from films can be provided by current-carrying and potential clamping contacts made, for example, of beryllium bronze. This makes possible to study the current-voltage characteristics of superconductors near the critical transition temperature to the superconducting state with high-density currents (104−105A/cm2) without significant heating of the samples.

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Complete Fabrication of a Traversable 3 µm Thick NbN Film Superconducting Coil with Cu plated layer of 42m in Length in a Spiral Three-Storied Trench Engraved in a Si Wafer of 76.2 mm in Diameter Formed by MEMS Technology for a Compact SMES with High Energy Storage Volume Density

Cited by 9 publications

References 2 publications

Estimation of the Electricity Storage Volume Density of Compact SMESs of a New Concept Based on Si Microfabrication Technologies

Estimation of the Electricity Storage Volume Density of Compact SMESs of a New Concept Based on Si Microfabrication Technologies

Моделирование Процесса Теплоотдачи Сверхпроводящих Пленок В Резистивном Состоянии

Mathematical modeling of heat transfer in the film-substrate-thermostat system during heating of an electrically conductive film by a high-density pulse current

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