Title page for ETD etd-11112004-141443

Type of Document

Dissertation

Author

Mao, Shaolin

URN

etd-11112004-141443

Title

Numerical Simulation of Quench Propagation in Superconducting Magnets by Using High Order Methods

Degree

Doctor of Philosophy

Department

Mechanical Engineering, Department of

Advisory Committee

Advisor Name	Title
Cesar A. Luongo	Committee Chair
Chiang Shih	Committee Member
David A. Cartes	Committee Member
David A. Kopriva	Committee Member

Keywords

High Order Method
Superconducting Magnet
CICC
Quench Propagation
Discontinuous Galerkin
Spectral Element

Date of Defense

2004-10-18

Availability

unrestricted

Abstract

In this study, two high-order numerical methods were applied to simulate quench propagation in cable-in-conduit superconductor (CICC) magnets. The main consideration in this dissertation is to seek some numerical methods with high accuracy (resolution) and efficiency. The first method was dispersion-relation-preserving (DRP) schemes to solve quench propagation in CICC at early phase to decrease dispersion errors. The second one was discontinuous Galerkin (DG) spectral element methods which overcome numerical difficulties encountered by most classical methods. The numerical solution showed high accuracy and resolution in large gradient regions of quench propagation. Roe’s approximate Riemann solver was solved for helium for the first time by using curve fitting to the Riemann integral.
In the study, a simple physical model, the energy balance model, was proposed for the first time to track the superfluid helium and normal helium fronts in CICC magnets. This new model was used to analyze the thermal stability the NHMFL 45-T hybrid magnets systems. This model resulted in high efficiency of numerical simulation of thermal stability analysis compared to complicated 1D quench propagation model. To improve numerical efficiency, adaptive mesh techniques were also introduced. This model can effectively speed up the simulation of helium boundary tracking problems while retaining high accuracy of simulation.

Files

Filename		Size	Approximate Download Time (Hours:Minutes:Seconds)
Filename		Size	28.8 Modem	56K Modem	ISDN (64 Kb)	ISDN (128 Kb)	Higher-speed Access
	01_maosl_FSU_2004_prelims.pdf	27.12 Kb	00:00:07	00:00:03	00:00:03	00:00:01	< 00:00:01
	02_maosl_FSU_2004_text.pdf	4.39 Mb	00:20:20	00:10:27	00:09:09	00:04:34	00:00:23