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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 Nonlo...
Adding New Ingredients to the Recipe of Plasma Soup: Stochasticity, Toroidicity, and Nonlocality

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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
키워드  
Plasma turbulence
기타저자  
University of California, San Diego Physics
기본자료저록  
Dissertations Abstracts International. 87-03B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■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.

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