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Measurement of Turbulence-Driven Reynolds Stress and Its Contribution to the Toroidal Intrinsic Rotation
Measurement of Turbulence-Driven Reynolds Stress and Its Contribution to the Toroidal Intrinsic Rotation
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151050
- ISBN
- 9798381971910
- DDC
- 530
- 저자명
- Qin, Xijie.
- 서명/저자
- Measurement of Turbulence-Driven Reynolds Stress and Its Contribution to the Toroidal Intrinsic Rotation
- 발행사항
- [Sl] : The University of Wisconsin - Madison, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 141 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-09, Section: B.
- 주기사항
- Advisor: Geiger, Benedikt.
- 학위논문주기
- Thesis (Ph.D.)--The University of Wisconsin - Madison, 2024.
- 초록/해제
- 요약Self-generated toroidal flow due to turbulent Reynolds stress is important in fusion plasmas since rotation and its shear improve confinement and stability. This study reports the first measurement of the turbulent Reynolds stress in fusion-grade plasma cores via correlated density and velocity fluctuations in the DIII-D tokamak. Experiments are conducted with both co- and counter-current Neutral Beam Injection (NBI) to control the net torque input and achieve a near-zero flat rotation profile. Electron Cyclotron Heating (ECH) is applied to alter the ion and electron heat fluxes and therefore the mixture of turbulence modes. High-quality fluctuation measurements are obtained via Beam Emission Spectroscopy (BES) and Ultra-Fast Charge Exchange Recombination Spectroscopy (UF-CHERS). Following the application of ECH, the toroidal rotation reverses from counter-current to co-current direction, and the turbulence instability shifts from dominant electron modes to a mixture of electron and ion modes. Residual stress is extracted from the measured toroidal Reynolds stress, and the resulting intrinsic torque is determined. During the NBI-only stage, the volume-integrated intrinsic torque is nearly zero. Upon the application of ECH, a strong rotation drive is identified at the plasma edge, resulting in a net co-current intrinsic torque of 0.40 ± 0.05 Nm, which is comparable to the −0.75 Nm counter-current NBI torque. The toroidal rotation profiles reconstructed using the inferred intrinsic torques align well with experimental observations, successfully reproducing the rotation changes with the application of ECH. These results provide valuable insights into the relationship between turbulence and plasma rotation, demonstrate convincing consistency with the theory of turbulence-driven intrinsic torque, and support the use of turbulence models to predict rotation profiles for future magnetic fusion facilities like ITER.
- 일반주제명
- Plasma physics
- 일반주제명
- Nuclear engineering
- 일반주제명
- Analytical chemistry
- 일반주제명
- Fluid mechanics
- 키워드
- Fusion plasmas
- 키워드
- Reynolds stress
- 키워드
- Tokamak
- 키워드
- Turbulence
- 기타저자
- The University of Wisconsin - Madison Nuclear Engineering & Engineering Physics
- 기본자료저록
- Dissertations Abstracts International. 85-09B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008250123s2024 us c eng d■001000017160620
■00520250211151050
■006m o d
■007cr#unu||||||||
■020 ▼a9798381971910
■035 ▼a(MiAaPQ)AAI31141319
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aQin, Xijie.
■24510▼aMeasurement of Turbulence-Driven Reynolds Stress and Its Contribution to the Toroidal Intrinsic Rotation
■260 ▼a[Sl]▼bThe University of Wisconsin - Madison▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a141 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-09, Section: B.
■500 ▼aAdvisor: Geiger, Benedikt.
■5021 ▼aThesis (Ph.D.)--The University of Wisconsin - Madison, 2024.
■520 ▼aSelf-generated toroidal flow due to turbulent Reynolds stress is important in fusion plasmas since rotation and its shear improve confinement and stability. This study reports the first measurement of the turbulent Reynolds stress in fusion-grade plasma cores via correlated density and velocity fluctuations in the DIII-D tokamak. Experiments are conducted with both co- and counter-current Neutral Beam Injection (NBI) to control the net torque input and achieve a near-zero flat rotation profile. Electron Cyclotron Heating (ECH) is applied to alter the ion and electron heat fluxes and therefore the mixture of turbulence modes. High-quality fluctuation measurements are obtained via Beam Emission Spectroscopy (BES) and Ultra-Fast Charge Exchange Recombination Spectroscopy (UF-CHERS). Following the application of ECH, the toroidal rotation reverses from counter-current to co-current direction, and the turbulence instability shifts from dominant electron modes to a mixture of electron and ion modes. Residual stress is extracted from the measured toroidal Reynolds stress, and the resulting intrinsic torque is determined. During the NBI-only stage, the volume-integrated intrinsic torque is nearly zero. Upon the application of ECH, a strong rotation drive is identified at the plasma edge, resulting in a net co-current intrinsic torque of 0.40 ± 0.05 Nm, which is comparable to the −0.75 Nm counter-current NBI torque. The toroidal rotation profiles reconstructed using the inferred intrinsic torques align well with experimental observations, successfully reproducing the rotation changes with the application of ECH. These results provide valuable insights into the relationship between turbulence and plasma rotation, demonstrate convincing consistency with the theory of turbulence-driven intrinsic torque, and support the use of turbulence models to predict rotation profiles for future magnetic fusion facilities like ITER.
■590 ▼aSchool code: 0262.
■650 4▼aPlasma physics
■650 4▼aNuclear engineering
■650 4▼aAnalytical chemistry
■650 4▼aFluid mechanics
■653 ▼aFusion plasmas
■653 ▼aIntrinsic rotation
■653 ▼aReynolds stress
■653 ▼aTokamak
■653 ▼aTurbulence
■690 ▼a0759
■690 ▼a0552
■690 ▼a0486
■690 ▼a0204
■71020▼aThe University of Wisconsin - Madison▼bNuclear Engineering & Engineering Physics.
■7730 ▼tDissertations Abstracts International▼g85-09B.
■790 ▼a0262
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160620▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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