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Development and Application of a Fluid Runaway Electron Model to Tokamak Disruptions
Development and Application of a Fluid Runaway Electron Model to Tokamak Disruptions
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211153130
- ISBN
- 9798346874423
- DDC
- 530
- 서명/저자
- Development and Application of a Fluid Runaway Electron Model to Tokamak Disruptions
- 발행사항
- [Sl] : The University of Wisconsin - Madison, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 163 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-06, Section: B.
- 주기사항
- Advisor: Sovinec, Carl R.
- 학위논문주기
- Thesis (Ph.D.)--The University of Wisconsin - Madison, 2024.
- 초록/해제
- 요약A series of computational studies have been completed to study the physics of energetic runaway electrons in tokamaks using a newly implemented model in the 3D, non-ideal magnetohydrodynamic code NIMROD. The model takes a fluid approach to representing the transport of runaway electrons, and couples the fluid to the evolution of the magnetic field via the assumption that the runaway species contributes a current that is free of resistive dissipation. The model includes sources of runaway density that allow simulations to self-consistently generate energetic electrons. A general background on tokamak disruptions and runaway electron phenomena is given. Basic fluid models of plasma are reviewed. A review and comparison of theoretical and computational modelling work pertaining to fluid models for runaway electrons is presented. Particular attention is paid to the subtlety of the modified Ohm's law. The NIMROD implementation of the model is benchmarked against other magnetohydrodynamic codes in both linear and nonlinear calculations, and demonstrate the influence of significant runaway current on the MHD system.A reduced, fluid, linear model reproduces the low-inertia limit of the resistive hose mode in a post-disruption runaway electron beam. Theoretical and computational results show that resistive hose mode has a stronger dependence on resistivity than resistive MHD instabilities. Because of this, it can be the dominant instability in a post-disruption run away beam scenario. A connection is made between previous results on resistive hose stability, and novel results in toroidal geometry are presented. Numerical calculations using the reduced model are presented and an analytic solution is found for a uniform density beam. The analytic model is shown to be a generalization of the results from previous work on resistive hose instabilities. Calculations of resistive hose mode growth rates in toroidal geometry both with and without the flow of the background plasma are presented. We find that decreasing the aspect ratio of the torus while maintaining a fixed equilibrium safety factor profile increases the growth rate of the hose mode. A preliminary application of the linear model shows the theoretical possibility for high-frequency hose modes in RE beam experiments in the DIII-D tokamak. Nonlinear calculations investigate the relaxation of an equilibrium profile that is unstable to resistive hose modes in both cylindrical and toroidal geometry. In cylindrical geometry, the hose mode driven fluctuations lead to a radially expanding helical structure that flattens the parallel current profile. The magnetic topology is modified only later in time after the initial saturation. In toroidal geometry the fluctuations are more virulent, and the magnetic topology is affected earlier.
- 일반주제명
- Plasma physics
- 일반주제명
- Nuclear engineering
- 일반주제명
- Nuclear physics
- 일반주제명
- Computational physics
- 키워드
- Disruption
- 키워드
- Runaway electron
- 키워드
- Tokamak
- 키워드
- Magnetic field
- 기타저자
- The University of Wisconsin - Madison Nuclear Engineering & Engineering Physics
- 기본자료저록
- Dissertations Abstracts International. 86-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211153130
■006m o d
■007cr#unu||||||||
■020 ▼a9798346874423
■035 ▼a(MiAaPQ)AAI31767637
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aSainterme, Alexandre Paul.
■24510▼aDevelopment and Application of a Fluid Runaway Electron Model to Tokamak Disruptions
■260 ▼a[Sl]▼bThe University of Wisconsin - Madison▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a163 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-06, Section: B.
■500 ▼aAdvisor: Sovinec, Carl R.
■5021 ▼aThesis (Ph.D.)--The University of Wisconsin - Madison, 2024.
■520 ▼aA series of computational studies have been completed to study the physics of energetic runaway electrons in tokamaks using a newly implemented model in the 3D, non-ideal magnetohydrodynamic code NIMROD. The model takes a fluid approach to representing the transport of runaway electrons, and couples the fluid to the evolution of the magnetic field via the assumption that the runaway species contributes a current that is free of resistive dissipation. The model includes sources of runaway density that allow simulations to self-consistently generate energetic electrons. A general background on tokamak disruptions and runaway electron phenomena is given. Basic fluid models of plasma are reviewed. A review and comparison of theoretical and computational modelling work pertaining to fluid models for runaway electrons is presented. Particular attention is paid to the subtlety of the modified Ohm's law. The NIMROD implementation of the model is benchmarked against other magnetohydrodynamic codes in both linear and nonlinear calculations, and demonstrate the influence of significant runaway current on the MHD system.A reduced, fluid, linear model reproduces the low-inertia limit of the resistive hose mode in a post-disruption runaway electron beam. Theoretical and computational results show that resistive hose mode has a stronger dependence on resistivity than resistive MHD instabilities. Because of this, it can be the dominant instability in a post-disruption run away beam scenario. A connection is made between previous results on resistive hose stability, and novel results in toroidal geometry are presented. Numerical calculations using the reduced model are presented and an analytic solution is found for a uniform density beam. The analytic model is shown to be a generalization of the results from previous work on resistive hose instabilities. Calculations of resistive hose mode growth rates in toroidal geometry both with and without the flow of the background plasma are presented. We find that decreasing the aspect ratio of the torus while maintaining a fixed equilibrium safety factor profile increases the growth rate of the hose mode. A preliminary application of the linear model shows the theoretical possibility for high-frequency hose modes in RE beam experiments in the DIII-D tokamak. Nonlinear calculations investigate the relaxation of an equilibrium profile that is unstable to resistive hose modes in both cylindrical and toroidal geometry. In cylindrical geometry, the hose mode driven fluctuations lead to a radially expanding helical structure that flattens the parallel current profile. The magnetic topology is modified only later in time after the initial saturation. In toroidal geometry the fluctuations are more virulent, and the magnetic topology is affected earlier.
■590 ▼aSchool code: 0262.
■650 4▼aPlasma physics
■650 4▼aNuclear engineering
■650 4▼aNuclear physics
■650 4▼aComputational physics
■653 ▼aDisruption
■653 ▼aRunaway electron
■653 ▼aTokamak
■653 ▼aResistive hose mode
■653 ▼aMagnetic field
■690 ▼a0759
■690 ▼a0552
■690 ▼a0756
■690 ▼a0216
■71020▼aThe University of Wisconsin - Madison▼bNuclear Engineering & Engineering Physics.
■7730 ▼tDissertations Abstracts International▼g86-06B.
■790 ▼a0262
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17165152▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
