Development of a thermal analysis tool for superconducting circuits

dc.contributor.advisorFourie, Coenraden_ZA
dc.contributor.authorVenter, Bernarden_ZA
dc.contributor.otherStellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering.en_ZA
dc.descriptionThesis (MEng)--Stellenbosch University, 2021.en_ZA
dc.description.abstractENGLISH ABSTRACT: Unforeseen heat generation or propagation adversely affects superconducting integrated circuits. The excess heat interferes with the performance of circuit elements sensitive to temperature, such as the Josephson junction (JJ). Research shows the increasing density of circuit elements due to the growing integration scale of superconducting circuits. The study aims to create a thermal analysis tool to simulate the heat propagation through a superconductor circuit before fabrication. The tool was created by deriving the thermal conductivity of superconducting metals, developing a finite element model of the structure, and simulating the heat propagation iteratively for a set of test conditions. The primary factors limiting the operation of the simulation is the assumption of zero magnetic field and perfect thermal contact. The heat transfer simulation through a Josephson Transmission Line (JTL) circuit demonstrated the operation of the thermal analysis tool. The thermal analysis performed on the JTL examined the effect an increasing bias current had on the surrounding area. The simulation showed a minimal temperature increase in the Josephson junction due to heat dissipated by the bias resistor. The large temperature increase was localised around the bias resistor. The thermal analysis tool successfully simulated the heat dissipation through a superconducting circuit for different test cases.en_ZA
dc.description.abstractAFRIKAANSE OPSOMMING: Onvoorsiene opwekking of verspreiding van hitte beïnvloed die supergeleidende geïntegreerde stroombane nadelig. Die oormatige hitte belemmer die werking van stroombaan elemente wat temperatuur sensitief is soos die Josephson junction (JJ). Navorsing toon aan die toenemende digtheid van stroombaan elemente as gevolg van die groeiende integrasie skaal van super geleidende stroombane. Die studie het ten doel om ’n instrument vir termiese analise te skep om die hitte-verspreiding deur ’n super geleier stroombaan te simuleer voordat dit vervaardig word. Die instrument is geskep deur die termiese geleidingsvermoë van super geleidende metale af te lei, ’n eindige element model van die struktuur te ontwikkel en die hitte-voortplanting iteratief te simuleer vir ’n stel toets omstandighede. Die primêre faktore wat die werking van die simulasie beperk, is die aanname van nul-magnetiese veld en perfekte termiese kontak. Die hitte-oordrag-simulasie deur ’n Josephson Transmission Line (JTL) stroombaan het die werking van die termiese analise instrument gedemonstreer. Die termiese analise wat op die JTL uitgevoer is, het die effek van ’n toenemende vooroordeel stroom op die omgewing ondersoek. Die simulasie het ’n minimale temperatuurtoename in die Josephson junction getoon as gevolg van hitte wat deur die vooroordeel resistor versprei word. Die groot temperatuurverhoging is gelokaliseer rondom die vooroordeel resistor. Die termiese analise instrument het die hitte-afvoer suksesvol gesimuleer deur ’n super geleidende stroombaan vir verskillende toetsgevalle.af_ZA
dc.format.extent125 pagesen_ZA
dc.publisherStellenbosch : Stellenbosch Universityen_ZA
dc.subjectThermal analysisen_ZA
dc.subjectSuperconducting generatorsen_ZA
dc.subjectHeat transfer -- Simulationen_ZA
dc.titleDevelopment of a thermal analysis tool for superconducting circuitsen_ZA
dc.rights.holderStellenbosch Universityen_ZA

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