Simulations for the Optimization of High Temperatur Superconductor Current Leads for Nuclear Fusion Applications PDF Download
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Author: Enrico Rizzo
Publisher:
ISBN: 9781013280962
Category : Science
Languages : en
Pages : 224
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Book Description
Techniques based on numerical simulations have been applied to the analysis of the heat exchanger and the High Temperature Superconductor (HTS) module of HTS current leads. In the first case correlations have been derived for the meander flow geometry. In the second case steady state and transient thermal-electric models have been validated. Both techniques are used to design and optimize HTS current leads. The correlations were applied to a predictive analysis of the ITER HTS current leads. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.
Author: Enrico Rizzo
Publisher:
ISBN: 9781013280962
Category : Science
Languages : en
Pages : 224
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Book Description
Techniques based on numerical simulations have been applied to the analysis of the heat exchanger and the High Temperature Superconductor (HTS) module of HTS current leads. In the first case correlations have been derived for the meander flow geometry. In the second case steady state and transient thermal-electric models have been validated. Both techniques are used to design and optimize HTS current leads. The correlations were applied to a predictive analysis of the ITER HTS current leads. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.
Author: Rizzo, Enrico
Publisher: KIT Scientific Publishing
ISBN: 3731501325
Category : Technology & Engineering
Languages : en
Pages : 232
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Book Description
Techniques based on numerical simulations have been applied to the analysis of the heat exchanger and the High Temperature Superconductor (HTS) module of HTS current leads. In the first case correlations have been derived for the meander flow geometry. In the second case steady state and transient thermal-electric models have been validated. Both techniques are used to design and optimize HTS current leads. The correlations were applied to a predictive analysis of the ITER HTS current leads.
Author: Preuß, Alan
Publisher: KIT Scientific Publishing
ISBN: 3731510413
Category : Technology & Engineering
Languages : en
Pages : 194
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Book Description
A design process for HTS DC cables was developed for high current applications. Based on the design process, a 35 kA HTS DC cable demonstrator was developed. The superconducting elements of the demonstrator were manufactured and tested individually at 77 K. Afterwards, the demonstrator cable was assembled and tested at 77 K. The assembled demonstrator successfully reached 35 kA at 77 K and self field conditions.
Author: Bayer, Christoph M.
Publisher: KIT Scientific Publishing
ISBN: 373150605X
Category : Physics
Languages : en
Pages : 222
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Book Description
Nuclear fusion is a key technology to satisfy the basic demand for electric energy sustainably. The official EUROfusion schedule foresees a first industrial DEMOnstration Fusion Power Plant for 2050. In this work several high temperature superconductor sub-size cables are investigated for their applicability in large scale DEMO toroidal field coils. Main focus lies on the electromechanical stability under the influence of high Lorentz forces at peak magnetic fields of up to 12 T.
Author: Rajeev Das
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
"The application of superconductors has always fascinated engineers because of their ability to provide very small resistive losses. Electric machines developed using superconductors provide the advantage of lower volume, and higher efficiency compared to conventional machines with similar specifications.High temperature superconductors (HTS) display the property of superconductivity at relatively higher temperatures compared to conventional superconductors. The use of HTS in electric machines provides substantial benefits in terms of less energy spent on refrigeration. In the field of computational electromagnetics, HTS in low frequency devices pose a few unique challenges that demand different approaches from the existing techniques applied in normal materials and conventional superconducting materials. This dissertation investigates the properties of HTS and then attempts to address various issues that arise while modeling and optimizing HTS based devices.The high degree of non-linearity in HTS presents significant difficulty for a solution to converge. This thesis models the behavior of HTS based low frequency examples, and suggests an approach that improves the convergence and reduces the computation time. In this effort, the successive substitution method and the Aitken approximation were used to develop the proposed algorithm.Subsequently, a multiphysics model of HTS based current leads was developed. To analyze the magnetic field problem, a 2D technique was considered, and the analysis of thermal behavior used a 3D approach. This study helped in determining the approach to solve both types of field problems associated with current leads and coupling the two sets of problems.Computational approaches to solve HTS based problems are still in their infancy and there is a shortage of data in this field. In order to generate more data, which could then be used in optimization or modeling of HTS devices, this work examined statistical methods that could be applied in such scenarios. In this thesis, aspects such as sampling methods of search space and methods to construct surrogates were researched; the use of Latin hypercube sampling (LHS) and Generalized Regression Neural Network (GRNN) are proposed.This dissertation ultimately considers a real world example of HTS current leads to address some of the challenges associated with them, specifically the reduction of heat leakage, the material used and the AC loss. To achieve these three goals, multi-objective optimization was considered and Differential Evolution (DE), a stochastic based technique was used to achieve the optimization goals. This facet of the thesis establishes the viability of stochastic methods to optimize systems with multiple goals to satisfy and having HTS a highly non-linear material in them, along with the possible objective functions and constraint relations." --
Author: Buchholz, Alexander
Publisher: KIT Scientific Publishing
ISBN: 3731511940
Category : Technology & Engineering
Languages : en
Pages : 246
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Book Description
High-temperature superconductors have distinct advantages compared to conventional conductors. Below their critical temperature, superconductors have immeasurably low ohmic losses. To maintain the superconducting state, superconductors require constant cooling. This study aims at identifying the environmental impacts of the application of superconductors in future grid technologies such as superconducting power cables.
Author: Godfrin, Aurélien
Publisher: KIT Scientific Publishing
ISBN: 3731510960
Category : Technology & Engineering
Languages : en
Pages : 146
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Book Description
This work focuses on two topics. The first is the investigation of producing filaments on copper-stabilized coated conductors, with striations made after or before electroplating the tape. The second topic is the applicability of the striations for reducing the AC losses of cables, in particular the CORC® and RACC cables, which are made with high-temperature superconductor (HTS) striated tapes.
Author: Naeckel, Oliver
Publisher: KIT Scientific Publishing
ISBN: 3731505266
Category : Physics
Languages : en
Pages : 220
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Book Description
Electrical power grids are the lifeline of technical infrastructure and fundamental for industry and modern lives. Fault Currents can disrupt the continuous supply of electrical energy, cause instable grid conditions and damage electrical equipment. The Air Coil Superconducting Fault Current Limiter (AC-SFCL) is a measure to effectively limit fault currents. The concept is investigated and proven experimentally by designing, building and successfully testing a 60 kV, 400 V, z = 6% demonstrator.
Author: Knehr, Emanuel Marius
Publisher: KIT Scientific Publishing
ISBN: 3731512564
Category : Technology & Engineering
Languages : en
Pages : 200
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Book Description
This work presents three advances to scale SNSPDs from few-pixel devices to large detector arrays: atomic layer deposition for the fabrication of uniform superconducting niobium nitride films of few-nanometer thickness, a frequency-multiplexing scheme to operate multiple detectors with a reduced number of lines, and the integration of SNSPDs with free-form polymer structures to achieve efficient optical coupling onto the active area of the detectors.
Author: Zou, Shengnan
Publisher: KIT Scientific Publishing
ISBN: 3731507153
Category : Technology (General)
Languages : en
Pages : 174
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Book Description
High temperature superconducting (HTS) bulks and stacks of coated conductors can be magnetized to become trapped-field magnets that provide much stronger magnetic fields than those reachable with conventional permanent magnets. This work investigates the flux dynamics during the magnetization of HTS trapped-field magnets and proposes possible strategies to improve the trapped field produced by the pulsed field magnetization method that is promising for practical applications.
