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Laboratory Investigation of Collisionless Kinetic Effects and 3D Topological Triggers for Magnetic Reconnection
Laboratory Investigation of Collisionless Kinetic Effects and 3D Topological Triggers for Magnetic Reconnection
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105638
- ISBN
- 9798265454461
- DDC
- 530
- 저자명
- Gradney, Paul D.
- 서명/저자
- Laboratory Investigation of Collisionless Kinetic Effects and 3D Topological Triggers for Magnetic Reconnection
- 발행사항
- [Sl] : The University of Wisconsin - Madison, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 117 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Includes supplementary digital materials.
- 주기사항
- Advisor: Egedal, Jan.
- 학위논문주기
- Thesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
- 초록/해제
- 요약Magnetic reconnection is a fundamental plasma process responsible for the rapid conversion of magnetic energy into particle energy. This process occurs ubiquitously in astrophysical, space, and laboratory plasmas, including solar flares, Earth's magnetosphere, and fusion devices. Despite its importance, key questions remain, including how reconnection dynamics are modified in the collisionless kinetic regime, and what mechanisms trigger fast reconnection in three-dimensional (3D) systems as they transition from stable or quasi-stable magnetic configurations to configurations that enable rapid energy release. This thesis presents experimental studies of collisionless magnetic reconnection using the Terrestrial Reconnection EXperiment (TREX) at the Wisconsin Plasma Physics Laboratory (WiPPL). To minimize collisional effects and access the kinetic regime relevant to space plasmas, a reconnection Drive Cylinder was developed. This system increases both the effective system size and the driving rate of reconnection, enabling TREX to reach a regime where electron dynamics are dominated by kinetic rather than collisional processes. Technical details of the Drive Cylinder design, including its coil configuration and magnetic field shaping, are presented along with measurements of its performance. Using the 3-coil TREX configuration, the dynamics of 3D reconnection were investigated in a laboratory-generated mini-magnetosphere. Observations demonstrate that the explosive onset of reconnection can be triggered by a bifurcation of the magnetic topological structure. In particular, the rapid approach and crossing of separatrix surfaces led to the bifurcation of magnetic null points, restructuring of separator lines, and a marked increase in the reconnection electric field along the separator. These results provide experimental evidence that geometric reconfiguration of a 3D magnetic topology can initiate the onset of fast reconnection. The findings have broad implications for understanding space weather, astrophysical explosions, and relaxation events in magnetically confined laboratory plasmas.
- 일반주제명
- Physics
- 일반주제명
- Plasma physics
- 일반주제명
- Electromagnetics
- 일반주제명
- Fluid mechanics
- 키워드
- Magnetopause
- 키워드
- Magnetosphere
- 기타저자
- The University of Wisconsin - Madison Physics
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017360917
■00520260202105638
■006m o d
■007cr#unu||||||||
■020 ▼a9798265454461
■035 ▼a(MiAaPQ)AAI32395392
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aGradney, Paul D.
■24510▼aLaboratory Investigation of Collisionless Kinetic Effects and 3D Topological Triggers for Magnetic Reconnection
■260 ▼a[Sl]▼bThe University of Wisconsin - Madison▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a117 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aIncludes supplementary digital materials.
■500 ▼aAdvisor: Egedal, Jan.
■5021 ▼aThesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
■520 ▼aMagnetic reconnection is a fundamental plasma process responsible for the rapid conversion of magnetic energy into particle energy. This process occurs ubiquitously in astrophysical, space, and laboratory plasmas, including solar flares, Earth's magnetosphere, and fusion devices. Despite its importance, key questions remain, including how reconnection dynamics are modified in the collisionless kinetic regime, and what mechanisms trigger fast reconnection in three-dimensional (3D) systems as they transition from stable or quasi-stable magnetic configurations to configurations that enable rapid energy release. This thesis presents experimental studies of collisionless magnetic reconnection using the Terrestrial Reconnection EXperiment (TREX) at the Wisconsin Plasma Physics Laboratory (WiPPL). To minimize collisional effects and access the kinetic regime relevant to space plasmas, a reconnection Drive Cylinder was developed. This system increases both the effective system size and the driving rate of reconnection, enabling TREX to reach a regime where electron dynamics are dominated by kinetic rather than collisional processes. Technical details of the Drive Cylinder design, including its coil configuration and magnetic field shaping, are presented along with measurements of its performance. Using the 3-coil TREX configuration, the dynamics of 3D reconnection were investigated in a laboratory-generated mini-magnetosphere. Observations demonstrate that the explosive onset of reconnection can be triggered by a bifurcation of the magnetic topological structure. In particular, the rapid approach and crossing of separatrix surfaces led to the bifurcation of magnetic null points, restructuring of separator lines, and a marked increase in the reconnection electric field along the separator. These results provide experimental evidence that geometric reconfiguration of a 3D magnetic topology can initiate the onset of fast reconnection. The findings have broad implications for understanding space weather, astrophysical explosions, and relaxation events in magnetically confined laboratory plasmas.
■590 ▼aSchool code: 0262.
■650 4▼aPhysics
■650 4▼aPlasma physics
■650 4▼aElectromagnetics
■650 4▼aFluid mechanics
■653 ▼aCollisionless kinetic regime
■653 ▼aMagnetic reconnection
■653 ▼aMagnetopause
■653 ▼aMagnetosphere
■653 ▼aTopological bifurcation
■690 ▼a0605
■690 ▼a0759
■690 ▼a0607
■690 ▼a0204
■71020▼aThe University of Wisconsin - Madison▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■790 ▼a0262
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360917▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


