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Measurement and Modeling of Radiation Temperature Fluctuations in the HSX Stellarator.
Measurement and Modeling of Radiation Temperature Fluctuations in the HSX Stellarator.

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자료유형  
 학위논문
Control Number  
0017162437
International Standard Book Number  
9798382826479
Dewey Decimal Classification Number  
530
Main Entry-Personal Name  
Singh, Luquant.
Publication, Distribution, etc. (Imprint  
[S.l.] : The University of Wisconsin - Madison., 2024
Publication, Distribution, etc. (Imprint  
Ann Arbor : ProQuest Dissertations & Theses, 2024
Physical Description  
133 p.
General Note  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
General Note  
Advisor: Geiger, Benedikt.
Dissertation Note  
Thesis (Ph.D.)--The University of Wisconsin - Madison, 2024.
Summary, Etc.  
요약The Helically Symmetric Experiment (HSX) stellarator has been optimized for low neoclassical transport. Anomalous transport attributed to drift-wave turbulence remains an important loss channel. High-resolution plasma diagnostics can be used to study fluctuations in equilibrium plasma parameters, such as plasma density and temperature, which are sensitive quantities of the underlying turbulence. In this work, core radiation temperature fluctuations were measured in the HSX stellarator using a correlation electron cyclotron emission radiometer. The experimental measurements have been compared with gyrokinetic simulations of plasma turbulence.The HSX correlation electron cyclotron emission diagnostic measures radiation temperature fluctuations from second harmonic X-mode wave emission in optically semi-transparent plasmas. Multiple pass raytracing calculations indicate reinforcement of single pass emission on the high-field side of the magnetic axis, permitting localized measurements. Interpretation of radiation temperature fluctuations as electron temperature fluctuations is within reasonable uncertainty, based on modeling of density fluctuation effects. It is found that long-wavelength radiation temperature fluctuations increase with the inverse scale length of electron temperature. This is consistent with linear gyrokinetic simulations of trapped electron mode turbulence, which show enhanced dominant linear growth rates at higher inverse scale length of electron temperature, and nonlinear gyrokinetic simulations, which when coupled with a synthetic diagnostic, reproduce the experimental trend in fluctuation amplitude. A synthetic frequency spectrum derived from a simulation of the trapped electron mode is similar in shape to the experimental frequency spectrum. The experimental observations and gyrokinetic predictions indicate that electron-temperature-gradient-driven trapped electron modes are destabilized in the core of HSX plasmas. These results improve the understanding of core turbulence in an optimized stellarator and inform optimization strategies for future devices.
Subject Added Entry-Topical Term  
Plasma physics.
Subject Added Entry-Topical Term  
Electrical engineering.
Subject Added Entry-Topical Term  
Electromagnetics.
Subject Added Entry-Topical Term  
Nuclear physics.
Index Term-Uncontrolled  
Magnetic confinement
Index Term-Uncontrolled  
Microwave radiometry
Index Term-Uncontrolled  
Nuclear fusion
Index Term-Uncontrolled  
Plasma diagnostics
Index Term-Uncontrolled  
Plasma turbulence
Index Term-Uncontrolled  
Stellarator
Added Entry-Corporate Name  
The University of Wisconsin - Madison Electrical and Computer Engineering
Host Item Entry  
Dissertations Abstracts International. 85-12B.
Electronic Location and Access  
로그인을 한후 보실 수 있는 자료입니다.
Control Number  
joongbu:657188

MARC

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■020    ▼a9798382826479
■035    ▼a(MiAaPQ)AAI31331300
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aSingh,  Luquant.
■24510▼aMeasurement  and  Modeling  of  Radiation  Temperature  Fluctuations  in  the  HSX  Stellarator.
■260    ▼a[S.l.]▼bThe  University  of  Wisconsin  -  Madison.  ▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a133  p.
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Geiger,  Benedikt.
■5021  ▼aThesis  (Ph.D.)--The  University  of  Wisconsin  -  Madison,  2024.
■520    ▼aThe  Helically  Symmetric  Experiment  (HSX)  stellarator  has  been  optimized  for  low  neoclassical  transport.  Anomalous  transport  attributed  to  drift-wave  turbulence  remains  an  important  loss  channel.  High-resolution  plasma  diagnostics  can  be  used  to  study  fluctuations  in  equilibrium  plasma  parameters,  such  as  plasma  density  and  temperature,  which  are  sensitive  quantities  of  the  underlying  turbulence.  In  this  work,  core  radiation  temperature  fluctuations  were  measured  in  the  HSX  stellarator  using  a  correlation  electron  cyclotron  emission  radiometer.  The  experimental  measurements  have  been  compared  with  gyrokinetic  simulations  of  plasma  turbulence.The  HSX  correlation  electron  cyclotron  emission  diagnostic  measures  radiation  temperature  fluctuations  from  second  harmonic  X-mode  wave  emission  in  optically  semi-transparent  plasmas.  Multiple  pass  raytracing  calculations  indicate  reinforcement  of  single  pass  emission  on  the  high-field  side  of  the  magnetic  axis,  permitting  localized  measurements.  Interpretation  of  radiation  temperature  fluctuations  as  electron  temperature  fluctuations  is  within  reasonable  uncertainty,  based  on  modeling  of  density  fluctuation  effects. It  is  found  that  long-wavelength  radiation  temperature  fluctuations  increase  with  the  inverse  scale  length  of  electron  temperature.  This  is  consistent  with  linear  gyrokinetic  simulations  of  trapped  electron  mode  turbulence,  which  show  enhanced  dominant  linear  growth  rates  at  higher  inverse  scale  length  of  electron  temperature,  and  nonlinear  gyrokinetic  simulations,  which  when  coupled  with  a  synthetic  diagnostic,  reproduce  the  experimental  trend  in  fluctuation  amplitude.  A  synthetic  frequency  spectrum  derived  from  a  simulation  of  the  trapped  electron  mode  is  similar  in  shape  to  the  experimental  frequency  spectrum.  The  experimental  observations  and  gyrokinetic  predictions  indicate  that  electron-temperature-gradient-driven  trapped  electron  modes  are  destabilized  in  the  core  of  HSX  plasmas.  These  results  improve  the  understanding  of  core  turbulence  in  an  optimized  stellarator  and  inform  optimization  strategies  for  future  devices.
■590    ▼aSchool  code:  0262.
■650  4▼aPlasma  physics.
■650  4▼aElectrical  engineering.
■650  4▼aElectromagnetics.
■650  4▼aNuclear  physics.
■653    ▼aMagnetic  confinement
■653    ▼aMicrowave  radiometry
■653    ▼aNuclear  fusion
■653    ▼aPlasma  diagnostics
■653    ▼aPlasma  turbulence
■653    ▼aStellarator
■690    ▼a0759
■690    ▼a0544
■690    ▼a0607
■690    ▼a0756
■71020▼aThe  University  of  Wisconsin  -  Madison▼bElectrical  and  Computer  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0262
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162437▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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