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Measurement and Modeling of Radiation Temperature Fluctuations in the HSX Stellarator.
Measurement and Modeling of Radiation Temperature Fluctuations in the HSX Stellarator.
상세정보
- 자료유형
- 학위논문
- Control Number
- 0017162437
- International Standard Book Number
- 9798382826479
- Dewey Decimal Classification Number
- 530
- Main Entry-Personal Name
- Singh, Luquant.
- Publication, Distribution, etc. (Imprint
- [S.l.] : The University of Wisconsin - Madison., 2024
- Publication, Distribution, etc. (Imprint
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- Physical Description
- 133 p.
- General Note
- Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
- General Note
- Advisor: Geiger, Benedikt.
- Dissertation Note
- Thesis (Ph.D.)--The University of Wisconsin - Madison, 2024.
- Summary, Etc.
- 요약The Helically Symmetric Experiment (HSX) stellarator has been optimized for low neoclassical transport. Anomalous transport attributed to drift-wave turbulence remains an important loss channel. High-resolution plasma diagnostics can be used to study fluctuations in equilibrium plasma parameters, such as plasma density and temperature, which are sensitive quantities of the underlying turbulence. In this work, core radiation temperature fluctuations were measured in the HSX stellarator using a correlation electron cyclotron emission radiometer. The experimental measurements have been compared with gyrokinetic simulations of plasma turbulence.The HSX correlation electron cyclotron emission diagnostic measures radiation temperature fluctuations from second harmonic X-mode wave emission in optically semi-transparent plasmas. Multiple pass raytracing calculations indicate reinforcement of single pass emission on the high-field side of the magnetic axis, permitting localized measurements. Interpretation of radiation temperature fluctuations as electron temperature fluctuations is within reasonable uncertainty, based on modeling of density fluctuation effects. It is found that long-wavelength radiation temperature fluctuations increase with the inverse scale length of electron temperature. This is consistent with linear gyrokinetic simulations of trapped electron mode turbulence, which show enhanced dominant linear growth rates at higher inverse scale length of electron temperature, and nonlinear gyrokinetic simulations, which when coupled with a synthetic diagnostic, reproduce the experimental trend in fluctuation amplitude. A synthetic frequency spectrum derived from a simulation of the trapped electron mode is similar in shape to the experimental frequency spectrum. The experimental observations and gyrokinetic predictions indicate that electron-temperature-gradient-driven trapped electron modes are destabilized in the core of HSX plasmas. These results improve the understanding of core turbulence in an optimized stellarator and inform optimization strategies for future devices.
- Subject Added Entry-Topical Term
- Plasma physics.
- Subject Added Entry-Topical Term
- Electrical engineering.
- Subject Added Entry-Topical Term
- Electromagnetics.
- Subject Added Entry-Topical Term
- Nuclear physics.
- Index Term-Uncontrolled
- Magnetic confinement
- Index Term-Uncontrolled
- Microwave radiometry
- Index Term-Uncontrolled
- Nuclear fusion
- Index Term-Uncontrolled
- Plasma diagnostics
- Index Term-Uncontrolled
- Plasma turbulence
- Index Term-Uncontrolled
- Stellarator
- Added Entry-Corporate Name
- The University of Wisconsin - Madison Electrical and Computer Engineering
- Host Item Entry
- Dissertations Abstracts International. 85-12B.
- Electronic Location and Access
- 로그인을 한후 보실 수 있는 자료입니다.
- Control Number
- joongbu:657188
MARC
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■00520250211152012
■006m o d
■007cr#unu||||||||
■020 ▼a9798382826479
■035 ▼a(MiAaPQ)AAI31331300
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aSingh, Luquant.
■24510▼aMeasurement and Modeling of Radiation Temperature Fluctuations in the HSX Stellarator.
■260 ▼a[S.l.]▼bThe University of Wisconsin - Madison. ▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a133 p.
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-12, Section: B.
■500 ▼aAdvisor: Geiger, Benedikt.
■5021 ▼aThesis (Ph.D.)--The University of Wisconsin - Madison, 2024.
■520 ▼aThe Helically Symmetric Experiment (HSX) stellarator has been optimized for low neoclassical transport. Anomalous transport attributed to drift-wave turbulence remains an important loss channel. High-resolution plasma diagnostics can be used to study fluctuations in equilibrium plasma parameters, such as plasma density and temperature, which are sensitive quantities of the underlying turbulence. In this work, core radiation temperature fluctuations were measured in the HSX stellarator using a correlation electron cyclotron emission radiometer. The experimental measurements have been compared with gyrokinetic simulations of plasma turbulence.The HSX correlation electron cyclotron emission diagnostic measures radiation temperature fluctuations from second harmonic X-mode wave emission in optically semi-transparent plasmas. Multiple pass raytracing calculations indicate reinforcement of single pass emission on the high-field side of the magnetic axis, permitting localized measurements. Interpretation of radiation temperature fluctuations as electron temperature fluctuations is within reasonable uncertainty, based on modeling of density fluctuation effects. It is found that long-wavelength radiation temperature fluctuations increase with the inverse scale length of electron temperature. This is consistent with linear gyrokinetic simulations of trapped electron mode turbulence, which show enhanced dominant linear growth rates at higher inverse scale length of electron temperature, and nonlinear gyrokinetic simulations, which when coupled with a synthetic diagnostic, reproduce the experimental trend in fluctuation amplitude. A synthetic frequency spectrum derived from a simulation of the trapped electron mode is similar in shape to the experimental frequency spectrum. The experimental observations and gyrokinetic predictions indicate that electron-temperature-gradient-driven trapped electron modes are destabilized in the core of HSX plasmas. These results improve the understanding of core turbulence in an optimized stellarator and inform optimization strategies for future devices.
■590 ▼aSchool code: 0262.
■650 4▼aPlasma physics.
■650 4▼aElectrical engineering.
■650 4▼aElectromagnetics.
■650 4▼aNuclear physics.
■653 ▼aMagnetic confinement
■653 ▼aMicrowave radiometry
■653 ▼aNuclear fusion
■653 ▼aPlasma diagnostics
■653 ▼aPlasma turbulence
■653 ▼aStellarator
■690 ▼a0759
■690 ▼a0544
■690 ▼a0607
■690 ▼a0756
■71020▼aThe University of Wisconsin - Madison▼bElectrical and Computer Engineering.
■7730 ▼tDissertations Abstracts International▼g85-12B.
■790 ▼a0262
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162437▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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