Long HTS Coated Conductor Processed via Large-Area PLD/ABAD for High-Field Applications

Usoskin, A.; Betz, U.; Dietrich, R.; Schlenga, K.

doi:10.1109/tasc.2016.2542253

Cited by 13 publications

(5 citation statements)

References 10 publications

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“…However, the pulse temperature was significantly lower, determined by only 2% of the energy triggered pulse, due to LFL which distributes the energy over a large substrate area. Because of the pulsed nature of PLD, energy and temperature effects occur as a sequence of short pulses [3,22]. Temperature pulses originating from condensation enthalpy should be added to the temperature pulses caused by 'condensation' of ion energy.…”

Section: Instantaneous Temperature At Ybco Surfacementioning

confidence: 99%

Long-length YBCO coated conductors for ultra-high field applications: gaining engineering current density via pulsed laser deposition/alternating beam-assisted deposition route

Usoskin

Betz

Gnilsen

et al. 2019

Supercond. Sci. Technol.

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Gaining engineering critical current density (J e ) in high-temperature superconducting (HTS) coated conductors based on double-disordered YBCO for operation at high fields is one of the key requirements in upcoming magnet/accelerator projects. Currently, the development of a tape with advanced J e -s is performed based on an alternating beam-assisted deposition–pulsed laser deposition (ABAD–PLD) manufacturing route. An obvious way to improve J e -s is to reduce substrate thickness. A 40% J e increase is expected owing to the thickness reduction from 100 to 50 μm. Nevertheless, the reduction of substrate thickness in case of the applied processing technology that employs relatively thick (2–3 μm) yttria-stabilized zirconia buffer layers leads to the manifestation of considerable strain in the tape resulting in strong tape bowing. Advanced processing routes have been developed to suppress this effect. The highest engineering current density was recorded at well above 1000 A mm−2 under an ultra-high field of 18 T at 4.2 K, B//c. Influence of tape bowing and the impact of longitudinal defects are studied via V–I measurements at 77 K and a moderate magnetic field with intrinsic edge gradients. Potential for further gaining of J e was found employing mechanisms of (i) film nucleation from lateral flows that provide material transfer during the PLD process. Further steps include suppressing the instability of instantaneous temperature via quasi-adiabatic pulsed heating of the growing HTS film via (ii) control of laser plume energy, and (iii) energy release during film condensation (condensation enthalpy). These effects disturb the instantaneous temperature of the growing HTS layer, which exhibits very limited capability of heat transfer. Temperature pulses reaching 30–40 K were evaluated via heat transfer modeling. Stabilization of the level of pulsed temperature during layer growth is anticipated to result in a further increase in J e .

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Section: Instantaneous Temperature At Ybco Surfacementioning

confidence: 99%

Long-length YBCO coated conductors for ultra-high field applications: gaining engineering current density via pulsed laser deposition/alternating beam-assisted deposition route

Usoskin

Betz

Gnilsen

et al. 2019

Supercond. Sci. Technol.

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“…Second, the field dependence of the critical current, i.e., the I c (B, θ) characteristics, set in the simulation was measured in 2021 for the HTS tapes manufactured in that year [48]; by contrast, the experimental coil was wound using the same type of HTS tape but was manufactured in 2022. It has been recognized that the I c (B, θ) characteristics, even for the same type of HTS tapes, may vary a lot among different manufacturing batches [56,57]. The simulated I c of the HTS coil is tested to be 92.8 A, while that in the experiment in figure 4(a) is 77.2 A.…”

Section: Simulation Analysismentioning

confidence: 99%

Time-variant magnetic field, voltage, and loss of no-insulation (NI) HTS magnet induced by dynamic resistance generation from external AC fields

Zhong

et al. 2023

Supercond. Sci. Technol.

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High-temperature superconducting (HTS) coils serving as DC magnets can be operated under non-negligible AC fields, like in synchronous machines of maglev trains and wind turbines. In these conditions, dynamic resistance generates in HTS tapes, causing redistribution/bypassing of the transport current inside the no-insulation (NI) coil and its unique operational features. This issue was studied by experiments on an NI coil with DC current supply put into external AC fields. Due to the current redistribution induced by dynamic resistance, the central magnetic field and voltage of the NI magnet initially undergo various transient processes, and eventually exhibit a stable central magnetic field reduction and a DC voltage. These time evolutions have implications for a time-varying torque and loss of an HTS machine. These time evolutions are strongly affected by the contact resistivity distribution, and whether it is the first time of the NI magnet being exposed to the AC field, showing several qualitatively different waveforms (e.g., some are even non-monotonic with time). The magnitudes of the stable central field reductions, and their observed linear correlation with the DC voltages are found to be decided by the local contact resistivity of the innermost and outermost several turns. It is also noted that the non-insulated turn-to-turn contact help lessening the loss induced by the dynamic resistance. A numerical model is established to analyse/explain those experimental results by observing the microscopic current distribution. Two risks of quench are noticed: (i) azimuthal current of the middle part turns increases as the AC field is applied; (ii) a concentration of radial current is observed near the terminals of the NI coil.

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“…In the present work, we explore the use of metal substrates on which are grown highly biaxially oriented thin films of YSZ (1500 nm) and CeO 2 (50 nm) made using ion beam- or alternating beam-assisted deposition (ABAD), a scalable and cost-effective technique which has already found commercial applicability for the deposition of YSZ films in the superconductor industry. , We follow a μSOFC device fabrication procedure as set out in Figure . We show that mesoporous VAN LSCF cathodes of high quality can be easily grown on stainless steel substrates with biaxially textured YSZ electrolyte–CeO 2 bilayers prepared by ABAD.…”

Section: Introductionmentioning

confidence: 99%

Route to High-Performance Micro-solid Oxide Fuel Cells on Metallic Substrates

Wells

Lovett

Chalklen

et al. 2021

ACS Appl. Mater. Interfaces

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Micro-solid oxide fuel cells based on thin films have strong potential for use in portable power devices. However, devices based on silicon substrate typically involves thin-film metallic electrodes which are unstable at high temperatures. Devices based on bulk metal substrates 2 overcome these limitations, though performance is hindered by the challenge of growing state-ofthe-art epitaxial materials on metals. Here, we demonstrate for the first time the growth of epitaxial cathode materials on metal substrates (stainless steel), commercially supplied with epitaxial electrolyte layers (1.5 m (Y 2 O 3 ) 0.15 (ZrO 2 ) 0.85 (YSZ) + 50 nm CeO 2 ). We create epitaxial mesoporous cathodes of (La 0.60 Sr 0.40 ) 0.95 Co 0.20 Fe 0.80 O 3 (LSCF) on the substrate by growing LSCF /MgO vertically aligned nanocomposite (VAN) films by pulsed laser deposition (PLD), followed by selectively etching out the MgO. To enable valid comparison with literature, the cathodes are also grown on single-crystal substrates, confirming state-of-the-art performance with an area specific resistance of 100 Ω at 500° C and activation energy down to 0.97 eV. The work marks an important step towards the commercialisation of high-performance microsolid oxide fuel cells for portable power applications.1.

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Long HTS Coated Conductor Processed via Large-Area PLD/ABAD for High-Field Applications

Cited by 13 publications

References 10 publications

Long-length YBCO coated conductors for ultra-high field applications: gaining engineering current density via pulsed laser deposition/alternating beam-assisted deposition route

Long-length YBCO coated conductors for ultra-high field applications: gaining engineering current density via pulsed laser deposition/alternating beam-assisted deposition route

Time-variant magnetic field, voltage, and loss of no-insulation (NI) HTS magnet induced by dynamic resistance generation from external AC fields

Route to High-Performance Micro-solid Oxide Fuel Cells on Metallic Substrates

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