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Adding New Ingredients to the Recipe of Plasma Soup: Stochasticity, Toroidicity, and Nonlocality
Adding New Ingredients to the Recipe of Plasma Soup: Stochasticity, Toroidicity, and Nonlocality
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104708
- ISBN
- 9798293839094
- DDC
- 530
- 저자명
- Cao, Mingyun.
- 서명/저자
- Adding New Ingredients to the Recipe of Plasma Soup: Stochasticity, Toroidicity, and Nonlocality
- 발행사항
- [Sl] : University of California, San Diego, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 144 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 주기사항
- Advisor: Diamond, Patrick H.
- 학위논문주기
- Thesis (Ph.D.)--University of California, San Diego, 2025.
- 초록/해제
- 요약In this dissertation, we advance the theoretical framework of plasma turbulence by introducing stochasticity, toroidicity, and nonlocality. In Chapter 1, an analysis of instability dynamics in a stochastic magnetic field is presented for the case of the resistive interchange mode. Small-scale convective cells are driven by the beat of the large-scale test mode and small-scale magnetic perturbations. In turn, these cells promote the turbulent mixing of the large-scale mode. A non-trivial correlation develops between the magnetic perturbations and the cells, indicating that turbulence "locks on" to the ambient stochasticity. It is also shown that the net effect of the stochastic magnetic field is to slow down the mode growth through magnetic braking, enhanced turbulent mixing, and electrostatic scattering.In Chapter 2, we present another multi-scale model of quasi-mode dynamics in a stochastic magnetic field. The resemblance between a quasi-mode and a ballooning mode in the mode structure enables us to obtain useful insights into how toroidicity affects the plasma dynamics in a background stochastic magnetic field. Owning to the broader mode structure of the quasi-mode, several results from Chapter 1 are modified. The turbulent viscosity and turbulent diffusivity produced by small-scale convective cells are found to be larger. A new mechanism for the stabilization of instabilities by ambient stochasticity is discovered-i.e., via a reduction in the effective drive. Recent experiments observed that regular, intense gradient relaxation events produced blobs and voids in pairs close to the separatrix. While blobs propagate outward and detach from the bulk plasma, voids move inward, and so stir the core plasma. In Chapter 3, we demonstrate that the Cherenkov emission of drift waves from voids can lead to substantial inward turbulent spreading. This nonlocal effect results in a broad turbulent layer of width ~100 ρs, for typical parameters. The model shows promise to resolve several questions surrounding the shortfall problem and the enhanced turbulence in the edge-core coupling region in tokamaks.
- 일반주제명
- Plasma physics
- 일반주제명
- Electromagnetics
- 일반주제명
- Physics
- 일반주제명
- Theoretical physics
- 일반주제명
- Fluid mechanics
- 키워드
- Stochasticity
- 키워드
- Toroidicity
- 키워드
- Nonlocality
- 기타저자
- University of California, San Diego Physics
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017358481
■00520260202104708
■006m o d
■007cr#unu||||||||
■020 ▼a9798293839094
■035 ▼a(MiAaPQ)AAI32117807
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aCao, Mingyun.
■24510▼aAdding New Ingredients to the Recipe of Plasma Soup: Stochasticity, Toroidicity, and Nonlocality
■260 ▼a[Sl]▼bUniversity of California, San Diego▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a144 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Diamond, Patrick H.
■5021 ▼aThesis (Ph.D.)--University of California, San Diego, 2025.
■520 ▼aIn this dissertation, we advance the theoretical framework of plasma turbulence by introducing stochasticity, toroidicity, and nonlocality. In Chapter 1, an analysis of instability dynamics in a stochastic magnetic field is presented for the case of the resistive interchange mode. Small-scale convective cells are driven by the beat of the large-scale test mode and small-scale magnetic perturbations. In turn, these cells promote the turbulent mixing of the large-scale mode. A non-trivial correlation develops between the magnetic perturbations and the cells, indicating that turbulence "locks on" to the ambient stochasticity. It is also shown that the net effect of the stochastic magnetic field is to slow down the mode growth through magnetic braking, enhanced turbulent mixing, and electrostatic scattering.In Chapter 2, we present another multi-scale model of quasi-mode dynamics in a stochastic magnetic field. The resemblance between a quasi-mode and a ballooning mode in the mode structure enables us to obtain useful insights into how toroidicity affects the plasma dynamics in a background stochastic magnetic field. Owning to the broader mode structure of the quasi-mode, several results from Chapter 1 are modified. The turbulent viscosity and turbulent diffusivity produced by small-scale convective cells are found to be larger. A new mechanism for the stabilization of instabilities by ambient stochasticity is discovered-i.e., via a reduction in the effective drive. Recent experiments observed that regular, intense gradient relaxation events produced blobs and voids in pairs close to the separatrix. While blobs propagate outward and detach from the bulk plasma, voids move inward, and so stir the core plasma. In Chapter 3, we demonstrate that the Cherenkov emission of drift waves from voids can lead to substantial inward turbulent spreading. This nonlocal effect results in a broad turbulent layer of width ~100 ρs, for typical parameters. The model shows promise to resolve several questions surrounding the shortfall problem and the enhanced turbulence in the edge-core coupling region in tokamaks.
■590 ▼aSchool code: 0033.
■650 4▼aPlasma physics
■650 4▼aElectromagnetics
■650 4▼aPhysics
■650 4▼aTheoretical physics
■650 4▼aFluid mechanics
■653 ▼aStochasticity
■653 ▼aToroidicity
■653 ▼aNonlocality
■653 ▼aPlasma turbulence
■690 ▼a0759
■690 ▼a0753
■690 ▼a0204
■690 ▼a0607
■690 ▼a0605
■71020▼aUniversity of California, San Diego▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0033
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358481▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


