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Modeling and Measurement of Fast Ion Losses in Wendelstein 7-X
Modeling and Measurement of Fast Ion Losses in Wendelstein 7-X
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152811
- ISBN
- 9798384466970
- DDC
- 530
- 서명/저자
- Modeling and Measurement of Fast Ion Losses in Wendelstein 7-X
- 발행사항
- [Sl] : Princeton University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 204 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
- 주기사항
- Advisor: Pablant, Novimir.
- 학위논문주기
- Thesis (Ph.D.)--Princeton University, 2024.
- 초록/해제
- 요약The confinement of fast ions, whether produced by fusion in a reactor or by heating methods such as neutral beam injection (NBI) and ion cyclotron resonance heating (ICRH), is crucial to the efficient operation of a fusion reactor or other plasma device. In stellarators, the lack of toroidal symmetry leads to poor confinement unless the magnetic geometry is optimized. The largest optimized stellarator in operation, Wendelstein 7-X (W7-X), was designed for good fast ion confinement at high plasma pressure ⟨β⟩ and high mirror ratio Bmax/Bmin by targeting a feature known as quasi-omnigeneity, in which the bounce-averaged radial drifts of trapped particles are minimized. To confirm the success of this optimization, diagnostics such as fast ion loss detectors (FILDs) are used to measure the losses of fast ions from W7-X.This work concerns the design of a scintillating FILD (S-FILD) for steady-state operation in W7-X, which will make use of a pair of pinhole-and-slit collimators, a phosphor-coated scintillator plate, a Faraday Cup, and a fast video camera to measure energy-and-pitch-resolved losses of NBI-produced fast ions. Because the 3D structure of the magnetic field means that the loss pattern is strongly localized, going from a measurement of losses at a single location to an assessment of overall confinement is non-trivial. A method has been developed for determining expected FILD signals from Monte Carlo simulations of fast ions in the plasma and their overall losses. This method is first used to reproduce experimental measurements made by a multi-channel Faraday Cup FILD (NIFS-FILD) currently in use on W7-X, finding the first quantitative agreement between simulation and measurement of fast ion losses on this device. The method is then used to predict both total ion flux to the S-FILD as well as the spatial distribution of this flux on the scintillator plate. Finally, based on these results, a potential update to the S-FILD design is suggested in order to improve the ability to measure counter-going fast ions.
- 일반주제명
- Plasma physics
- 일반주제명
- Nuclear physics
- 키워드
- Fast ion
- 키워드
- Nuclear fusion
- 키워드
- Simulation
- 키워드
- Stellarator
- 기타저자
- Princeton University Astrophysical Sciences-Plasma Physics Program
- 기본자료저록
- Dissertations Abstracts International. 86-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211152811
■006m o d
■007cr#unu||||||||
■020 ▼a9798384466970
■035 ▼a(MiAaPQ)AAI31557883
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aLeViness, Alexandra.▼0(orcid)0000-0002-2552-0411
■24510▼aModeling and Measurement of Fast Ion Losses in Wendelstein 7-X
■260 ▼a[Sl]▼bPrinceton University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a204 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-04, Section: B.
■500 ▼aAdvisor: Pablant, Novimir.
■5021 ▼aThesis (Ph.D.)--Princeton University, 2024.
■520 ▼aThe confinement of fast ions, whether produced by fusion in a reactor or by heating methods such as neutral beam injection (NBI) and ion cyclotron resonance heating (ICRH), is crucial to the efficient operation of a fusion reactor or other plasma device. In stellarators, the lack of toroidal symmetry leads to poor confinement unless the magnetic geometry is optimized. The largest optimized stellarator in operation, Wendelstein 7-X (W7-X), was designed for good fast ion confinement at high plasma pressure ⟨β⟩ and high mirror ratio Bmax/Bmin by targeting a feature known as quasi-omnigeneity, in which the bounce-averaged radial drifts of trapped particles are minimized. To confirm the success of this optimization, diagnostics such as fast ion loss detectors (FILDs) are used to measure the losses of fast ions from W7-X.This work concerns the design of a scintillating FILD (S-FILD) for steady-state operation in W7-X, which will make use of a pair of pinhole-and-slit collimators, a phosphor-coated scintillator plate, a Faraday Cup, and a fast video camera to measure energy-and-pitch-resolved losses of NBI-produced fast ions. Because the 3D structure of the magnetic field means that the loss pattern is strongly localized, going from a measurement of losses at a single location to an assessment of overall confinement is non-trivial. A method has been developed for determining expected FILD signals from Monte Carlo simulations of fast ions in the plasma and their overall losses. This method is first used to reproduce experimental measurements made by a multi-channel Faraday Cup FILD (NIFS-FILD) currently in use on W7-X, finding the first quantitative agreement between simulation and measurement of fast ion losses on this device. The method is then used to predict both total ion flux to the S-FILD as well as the spatial distribution of this flux on the scintillator plate. Finally, based on these results, a potential update to the S-FILD design is suggested in order to improve the ability to measure counter-going fast ions.
■590 ▼aSchool code: 0181.
■650 4▼aPlasma physics
■650 4▼aNuclear physics
■653 ▼aFast ion
■653 ▼aNuclear fusion
■653 ▼aPlasma diagnostics
■653 ▼aSimulation
■653 ▼aStellarator
■690 ▼a0759
■690 ▼a0756
■71020▼aPrinceton University▼bAstrophysical Sciences-Plasma Physics Program.
■7730 ▼tDissertations Abstracts International▼g86-04B.
■790 ▼a0181
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163931▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
