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Characterization of Tearing Mode Dynamics with the Radial Interferometer-Polarimeter on DIII-D
Characterization of Tearing Mode Dynamics with the Radial Interferometer-Polarimeter on DI...
Characterization of Tearing Mode Dynamics with the Radial Interferometer-Polarimeter on DIII-D

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자료유형  
 학위논문 서양
최종처리일시  
20260202105118
ISBN  
9798291559390
DDC  
530
저자명  
Myers, Rachel A.
서명/저자  
Characterization of Tearing Mode Dynamics with the Radial Interferometer-Polarimeter on DIII-D
발행사항  
[Sl] : The University of Wisconsin - Madison, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
250 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
주기사항  
Advisor: Sarff, John S.
학위논문주기  
Thesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
초록/해제  
요약The Radial Interferometer-Polarimeter (RIP) diagnostic on the DIII-D tokamak measures density and magnetic fluctuations throughout the plasma. RIP is particularly useful for detecting core-resonant tearing modes, a potentially dangerous magnetic instability. These modes may not be detected with external sensing coils. Mode amplitudes measured with RIP are compared to those measured with sensing coils and to the output of a linear magnetohydrodynamic stability model that allows inclusion of toroidicity and shaping. Due to its line-averaged nature, RIP cannot detect fluctuations with even poloidal mode number, m. It is confirmed that RIP measures even-m modes through their odd-m sidebands, which are generated by toroidicity and shaping.Results of a DIII-D experiment measuring shaping effects on RIP measurements and tearing stability at low elongation are presented. These plasmas were dominated by the sawtooth instability, which was expected to trigger tearing modes but did not. Tearing mode appearance was uncommon but tearing modes that did appear were associated with current gradients. Even-m modes were easily measured by RIP because toroidicity induced strong, detectable odd-m sidebands. Odd-m modes were weaker than previously measured, hypothesized to be due to low elongation. Internal measurements show that toroidicity and shaping significantly contribute to RIP-measured mode structure and stability.ITER and reactors must avoid bursty edge localized modes (ELMs) that may damage plasma-facing components. QH-mode, an advanced scenario, is attractive because it suppresses ELMs via the edge harmonic oscillation (EHO), another magnetic fluctuation. Using RIP and other diagnostics, it is confirmed experimentally that EHO components are nonlinearly coupled throughout QH-mode. This coupling matches simulations predicting that coupling sustains the EHO. When core-resonant tearing modes are present, RIP, but not sensing coils, detects nonlinear coupling between the tearing modes and the EHO. The EHO is interrupted, which prevents access to long-lived QH-mode. These results illustrate that nonlinear coupling sustains the EHO and provide the first evidence that core-resonant tearing modes can modify QH-mode development. Preventing core-edge coupling may help make QH-mode and other advanced scenarios more robust.
일반주제명  
Plasma physics
일반주제명  
Electromagnetics
일반주제명  
Particle physics
키워드  
Edge localized modes
키워드  
Fusion
키워드  
Magnetohydrodynamic
키워드  
Polarimetry
키워드  
Tearing modes
기타저자  
The University of Wisconsin - Madison Physics
기본자료저록  
Dissertations Abstracts International. 87-02B.
전자적 위치 및 접속  
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MARC

 008260126s2025        us                              c    eng  d
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■006m          o    d                
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■020    ▼a9798291559390
■035    ▼a(MiAaPQ)AAI32238015
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aMyers,  Rachel  A.
■24510▼aCharacterization  of  Tearing  Mode  Dynamics  with  the  Radial  Interferometer-Polarimeter  on  DIII-D
■260    ▼a[Sl]▼bThe  University  of  Wisconsin  -  Madison▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a250  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-02,  Section:  B.
■500    ▼aAdvisor:  Sarff,  John  S.
■5021  ▼aThesis  (Ph.D.)--The  University  of  Wisconsin  -  Madison,  2025.
■520    ▼aThe  Radial  Interferometer-Polarimeter  (RIP)  diagnostic  on  the  DIII-D  tokamak  measures  density  and  magnetic  fluctuations  throughout  the  plasma.  RIP  is  particularly  useful  for  detecting  core-resonant  tearing  modes,  a  potentially  dangerous  magnetic  instability.  These  modes  may  not  be  detected  with  external  sensing  coils.  Mode  amplitudes  measured  with  RIP  are  compared  to  those  measured  with  sensing  coils  and  to  the  output  of  a  linear  magnetohydrodynamic  stability  model  that  allows  inclusion  of  toroidicity  and  shaping.  Due  to  its  line-averaged  nature,  RIP  cannot  detect  fluctuations  with  even  poloidal  mode  number,  m.  It  is  confirmed  that  RIP  measures  even-m  modes  through  their  odd-m  sidebands,  which  are  generated  by  toroidicity  and  shaping.Results  of  a  DIII-D  experiment  measuring  shaping  effects  on  RIP  measurements  and  tearing  stability  at  low  elongation  are  presented.  These  plasmas  were  dominated  by  the  sawtooth  instability,  which  was  expected  to  trigger  tearing  modes  but  did  not.  Tearing  mode  appearance  was  uncommon  but  tearing  modes  that  did  appear  were  associated  with  current  gradients.  Even-m  modes  were  easily  measured  by  RIP  because  toroidicity  induced  strong,  detectable  odd-m  sidebands.  Odd-m  modes  were  weaker  than  previously  measured,  hypothesized  to  be  due  to  low  elongation.  Internal  measurements  show  that  toroidicity  and  shaping  significantly  contribute  to  RIP-measured  mode  structure  and  stability.ITER  and  reactors  must  avoid  bursty  edge  localized  modes  (ELMs)  that  may  damage  plasma-facing  components.  QH-mode,  an  advanced  scenario,  is  attractive  because  it  suppresses  ELMs  via  the  edge  harmonic  oscillation  (EHO),  another  magnetic  fluctuation.  Using  RIP  and  other  diagnostics,  it  is  confirmed  experimentally  that  EHO  components  are  nonlinearly  coupled  throughout  QH-mode.  This  coupling  matches  simulations  predicting  that  coupling  sustains  the  EHO.  When  core-resonant  tearing  modes  are  present,  RIP,  but  not  sensing  coils,  detects  nonlinear  coupling  between  the  tearing  modes  and  the  EHO.  The  EHO  is  interrupted,  which  prevents  access  to  long-lived  QH-mode.  These  results  illustrate  that  nonlinear  coupling  sustains  the  EHO  and  provide  the  first  evidence  that  core-resonant  tearing  modes  can  modify  QH-mode  development.  Preventing  core-edge  coupling  may  help  make  QH-mode  and  other  advanced  scenarios  more  robust.
■590    ▼aSchool  code:  0262.
■650  4▼aPlasma  physics
■650  4▼aElectromagnetics
■650  4▼aParticle  physics
■653    ▼aEdge  localized  modes
■653    ▼aFusion
■653    ▼aMagnetohydrodynamic
■653    ▼aPolarimetry
■653    ▼aTearing  modes
■690    ▼a0759
■690    ▼a0798
■690    ▼a0607
■71020▼aThe  University  of  Wisconsin  -  Madison▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g87-02B.
■790    ▼a0262
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359435▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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