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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 DIII-D
상세정보
- 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
- Fusion
- 키워드
- Polarimetry
- 키워드
- Tearing modes
- 기타저자
- The University of Wisconsin - Madison Physics
- 기본자료저록
- Dissertations Abstracts International. 87-02B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017359435
■00520260202105118
■006m o d
■007cr#unu||||||||
■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.


