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Ion Doppler Tomography for Ion Temperature and Velocity Measurements During High Guide Field Magnetic Reconnection
Ion Doppler Tomography for Ion Temperature and Velocity Measurements During High Guide Fie...
Ion Doppler Tomography for Ion Temperature and Velocity Measurements During High Guide Field Magnetic Reconnection

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20250211150936
ISBN  
9798382191218
DDC  
530
저자명  
Goodman, Aaron A.
서명/저자  
Ion Doppler Tomography for Ion Temperature and Velocity Measurements During High Guide Field Magnetic Reconnection
발행사항  
[Sl] : Princeton University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
176 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-10, Section: B.
주기사항  
Advisor: Ji, Hantao.
학위논문주기  
Thesis (Ph.D.)--Princeton University, 2024.
초록/해제  
요약A novel ion Doppler diagnostic is developed to measure ion temperature and out-of-plane velocity during magnetic reconnection on the Magnetic Reconnection Experiment (MRX) and the Facility for Laboratory Reconnection (FLARE). The diagnostic utilizes tomographic inversion of line integrated measurements and is capable of resolving ion temperatures of 5 eV and toroidal velocities of 4 km/s of Helium plasmas.A custom spectrometer, utilizing a high-throughput volume phase holographic (VPH) grating was constructed to achieve maximum fidelity measurements across a range of operation conditions in MRX. A novel tomographic inversion technique was also developed to address the low photon counts measured on MRX. The technique utilizes a least-squares minimization technique based on the trust region reflective algorithm to discover the most appropriate emissivity, out-of-plane velocity, and ion temperature profiles corresponding to the line-integrated measurements taken by the diagnostic. The algorithm utilizes a collisionless emission model for an axisymmetric plasma including radial velocity.The diagnostic performance is demonstrated during the study of ion energization during high guide field magnetic reconnection experiments on MRX. Multiple guide field strengths greater than the value of the reconnecting field are studied in the collisionless regime. Mostly flat, elevated ion temperatures near 10 eV are measured with no discernible trend in the structure or magnitude of heating across various guide field values. Slight peaks in out-of-plane velocity are measured at both conditions, with slightly greater magnitudes measured at higher guide fields. The electric field's role in ion energization and heating is discussed at all conditions and the influence of heating due to polarization drift is highlighted for a single condition.
일반주제명  
Plasma physics
일반주제명  
Optics
일반주제명  
Electromagnetics
키워드  
Ion temperature
키워드  
Ion velocity
키워드  
Magnetic reconnection
키워드  
Plasma
키워드  
Spectroscopy
키워드  
Tomography
기타저자  
Princeton University Mechanical and Aerospace Engineering
기본자료저록  
Dissertations Abstracts International. 85-10B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

 008250123s2024        us                              c    eng  d
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■00520250211150936
■006m          o    d                
■007cr#unu||||||||
■020    ▼a9798382191218
■035    ▼a(MiAaPQ)AAI30991007
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aGoodman,  Aaron  A.
■24510▼aIon  Doppler  Tomography  for  Ion  Temperature  and  Velocity  Measurements  During  High  Guide  Field  Magnetic  Reconnection
■260    ▼a[Sl]▼bPrinceton  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a176  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-10,  Section:  B.
■500    ▼aAdvisor:  Ji,  Hantao.
■5021  ▼aThesis  (Ph.D.)--Princeton  University,  2024.
■520    ▼aA  novel  ion  Doppler  diagnostic  is  developed  to  measure  ion  temperature  and  out-of-plane  velocity  during  magnetic  reconnection  on  the  Magnetic  Reconnection  Experiment  (MRX)  and  the  Facility  for  Laboratory  Reconnection  (FLARE).  The  diagnostic  utilizes  tomographic  inversion  of  line  integrated  measurements  and  is  capable  of  resolving  ion  temperatures  of  5  eV  and  toroidal  velocities  of  4  km/s  of  Helium  plasmas.A  custom  spectrometer,  utilizing  a  high-throughput  volume  phase  holographic  (VPH)  grating  was  constructed  to  achieve  maximum  fidelity  measurements  across  a  range  of  operation  conditions  in  MRX.  A  novel  tomographic  inversion  technique  was  also  developed  to  address  the  low  photon  counts  measured  on  MRX.  The  technique  utilizes  a  least-squares  minimization  technique  based  on  the  trust  region  reflective  algorithm  to  discover  the  most  appropriate  emissivity,  out-of-plane  velocity,  and  ion  temperature  profiles  corresponding  to  the  line-integrated  measurements  taken  by  the  diagnostic.  The  algorithm  utilizes  a  collisionless  emission  model  for  an  axisymmetric  plasma  including  radial  velocity.The  diagnostic  performance  is  demonstrated  during  the  study  of  ion  energization  during  high  guide  field  magnetic  reconnection  experiments  on  MRX.  Multiple  guide  field  strengths  greater  than  the  value  of  the  reconnecting  field  are  studied  in  the  collisionless  regime.  Mostly  flat,  elevated  ion  temperatures  near  10  eV  are  measured  with  no  discernible  trend  in  the  structure  or  magnitude  of  heating  across  various  guide  field  values.  Slight  peaks  in  out-of-plane  velocity  are  measured  at  both  conditions,  with  slightly  greater  magnitudes  measured  at  higher  guide  fields.  The  electric  field's  role  in  ion  energization  and  heating  is  discussed  at  all  conditions  and  the  influence  of  heating  due  to  polarization  drift  is  highlighted  for  a  single  condition.
■590    ▼aSchool  code:  0181.
■650  4▼aPlasma  physics
■650  4▼aOptics
■650  4▼aElectromagnetics
■653    ▼aIon  temperature
■653    ▼aIon  velocity
■653    ▼aMagnetic  reconnection
■653    ▼aPlasma
■653    ▼aSpectroscopy
■653    ▼aTomography
■690    ▼a0759
■690    ▼a0752
■690    ▼a0607
■71020▼aPrinceton  University▼bMechanical  and  Aerospace  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g85-10B.
■790    ▼a0181
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160219▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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