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Spectral Multiplexing on the HSX Thomson Scattering Diagnostic
Spectral Multiplexing on the HSX Thomson Scattering Diagnostic
Spectral Multiplexing on the HSX Thomson Scattering Diagnostic

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211151458
ISBN  
9798382591759
DDC  
530
저자명  
Goodman, Wayne.
서명/저자  
Spectral Multiplexing on the HSX Thomson Scattering Diagnostic
발행사항  
[Sl] : The University of Wisconsin - Madison, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
161 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
주기사항  
Advisor: Geiger, Benedikt.
학위논문주기  
Thesis (Ph.D.)--The University of Wisconsin - Madison, 2024.
초록/해제  
요약Thomson scattering is a fundamental diagnostic tool in high-temperature plasma experiments, providing crucial measurements of electron temperature and density profiles. The operation of Thomson scattering diagnostics involves the propagation of an intense radiation beam through an ionized plasma, with the scattered light from free electrons within the plasma being analyzed. The spectral content of this scattered light contains information on the temperature and density of the plasma under observation. In this work, sources of error are derived and deconstructed for a Thomson scattering system, focusing on three key factors that influence measurement uncertainty: the number of primary photoelectrons generated per pulse, the uncertainty arising from the non-ideal nature of the physical detection apparatus, and the analysis routine's ability to converge on a correct solution.Meticulous examination of these error terms has led to a significant redesign of the Thomson Scattering system at the Helically Symmetric eXperiment (HSX). This redesign, aimed at reducing noise susceptibility while increasing system bandwidth and gain, has involved electronic upgrades and the development of a new signal analysis routine. Results from testing are promising, showing that the redesigned detection electronics and analysis routine have significantly decreased measurement errors compared to the previous diagnostic setup. This work goes beyond systematic improvements, focusing on enhancing the quality and content of measured data without increasing the required number of spectral channels, leading to the development of a novel spectral analysis technique, Thomson Scattering Spectral Multiplexing (TSSM). In a standard Thomson scattering diagnostic, scattered light is divided into wide spectral bands by a filter polychromator equipped with three to eight single bandpass filters. TSSM leverages advanced filters with multiple spectral bands to efficiently utilize Thomson scattered spectra. The results of implementing two TSSM filter sets on the HSX Thomson scattering diagnostic show a reduction in measurement uncertainty and an increased range of electron temperature measurements compared to a filter set with an equivalent number of spectral channels. As a result of this work, the Thomson scattering diagnostic on HSX is now performing at a previously thought unachievable level.
일반주제명  
Plasma physics
일반주제명  
Electrical engineering
일반주제명  
Computer engineering
키워드  
Plasma diagnostics
키워드  
Polychromator
키워드  
Thomson scattering
키워드  
Helically Symmetric eXperiment
기타저자  
The University of Wisconsin - Madison Electrical and Computer Engineering
기본자료저록  
Dissertations Abstracts International. 85-11B.
전자적 위치 및 접속  
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MARC

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■035    ▼a(MiAaPQ)AAI31297463
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aGoodman,  Wayne.
■24510▼aSpectral  Multiplexing  on  the  HSX  Thomson  Scattering  Diagnostic
■260    ▼a[Sl]▼bThe  University  of  Wisconsin  -  Madison▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a161  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-11,  Section:  B.
■500    ▼aAdvisor:  Geiger,  Benedikt.
■5021  ▼aThesis  (Ph.D.)--The  University  of  Wisconsin  -  Madison,  2024.
■520    ▼aThomson  scattering  is  a  fundamental  diagnostic  tool  in  high-temperature  plasma  experiments,  providing  crucial  measurements  of  electron  temperature  and  density  profiles.  The  operation  of  Thomson  scattering  diagnostics  involves  the  propagation  of  an  intense  radiation  beam  through  an  ionized  plasma,  with  the  scattered  light  from  free  electrons  within  the  plasma  being  analyzed.  The  spectral  content  of  this  scattered  light  contains  information  on  the  temperature  and  density  of  the  plasma  under  observation.  In  this  work,  sources  of  error  are  derived  and  deconstructed  for  a  Thomson  scattering  system,  focusing  on  three  key  factors  that  influence  measurement  uncertainty:  the  number  of  primary  photoelectrons  generated  per  pulse,  the  uncertainty  arising  from  the  non-ideal  nature  of  the  physical  detection  apparatus,  and  the  analysis  routine's  ability  to  converge  on  a  correct  solution.Meticulous  examination  of  these  error  terms  has  led  to  a  significant  redesign  of  the  Thomson  Scattering  system  at  the  Helically  Symmetric  eXperiment  (HSX).  This  redesign,  aimed  at  reducing  noise  susceptibility  while  increasing  system  bandwidth  and  gain,  has  involved  electronic  upgrades  and  the  development  of  a  new  signal  analysis  routine.  Results  from  testing  are  promising,  showing  that  the  redesigned  detection  electronics  and  analysis  routine  have  significantly  decreased  measurement  errors  compared  to  the  previous  diagnostic  setup. This  work  goes  beyond  systematic  improvements,  focusing  on  enhancing  the  quality  and  content  of  measured  data  without  increasing  the  required  number  of  spectral  channels,  leading  to  the  development  of  a  novel  spectral  analysis  technique,  Thomson  Scattering  Spectral  Multiplexing  (TSSM).  In  a  standard  Thomson  scattering  diagnostic,  scattered  light  is  divided  into  wide  spectral  bands  by  a  filter  polychromator  equipped  with  three  to  eight  single  bandpass  filters.  TSSM  leverages  advanced  filters  with  multiple  spectral  bands  to  efficiently  utilize  Thomson  scattered  spectra.  The  results  of  implementing  two  TSSM  filter  sets  on  the  HSX  Thomson  scattering  diagnostic  show  a  reduction  in  measurement  uncertainty  and  an  increased  range  of  electron  temperature  measurements  compared  to  a  filter  set  with  an  equivalent  number  of  spectral  channels.  As  a  result  of  this  work,  the  Thomson  scattering  diagnostic  on  HSX  is  now  performing  at  a  previously  thought  unachievable  level.
■590    ▼aSchool  code:  0262.
■650  4▼aPlasma  physics
■650  4▼aElectrical  engineering
■650  4▼aComputer  engineering
■653    ▼aPlasma  diagnostics
■653    ▼aPolychromator
■653    ▼aThomson  scattering
■653    ▼aHelically  Symmetric  eXperiment
■690    ▼a0759
■690    ▼a0544
■690    ▼a0464
■71020▼aThe  University  of  Wisconsin  -  Madison▼bElectrical  and  Computer  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g85-11B.
■790    ▼a0262
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161889▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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