서브메뉴
검색
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 Field Magnetic Reconnection
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211150936
- ISBN
- 9798382191218
- DDC
- 530
- 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
- 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■001000017160219
■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.
