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Development of the Zeeman Polarization Spectroscopy System on Cobra
Development of the Zeeman Polarization Spectroscopy System on Cobra
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152036
- ISBN
- 9798384049609
- DDC
- 530
- 서명/저자
- Development of the Zeeman Polarization Spectroscopy System on Cobra
- 발행사항
- [Sl] : Cornell University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 227 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
- 주기사항
- Advisor: Hammer, David.
- 학위논문주기
- Thesis (Ph.D.)--Cornell University, 2024.
- 초록/해제
- 요약An imploding gas puff z-pinch is the magnetic compression of a cylindrical plasma along the central axis. This implosion occurs when an axial current parallel to the z-axis creates a magnetic field outside the cylinder. As the magnetic pressure increases the cylinder compresses radially, ideally forming the z-pinch along the axis.The density and temperature at pinch time can be very high and for this reason some private companies are exploring z-pinches to produce fusion energy. The magnetic field profile responsible for the z-pinch is inherently dependent on the distribution of the current within the plasma. Currently, probes used to measure the magnetic field distribution, and from that the current distribution, are easily destroyed by the high energy density plasma (HEDP) produced in the process. Therefore it would be beneficial to develop a spectroscopic means to measure the magnetic field as the z-pinch develops.A magnetic field (B-field) splits atomic energy levels, causing spectral lines to split. The B-field magnitude determines the splitting and therefore, by measuring the spectrum, one can determine the B-field. The Stark (electric field) broadening of spectral lines is substantial in dense plasma, with multi-nm width, and for typical fields of 5 T, the Zeeman splitting, as measured by the Zeeman Polarization Spectroscopic (ZPS) system, is only fractions of a nm. In order to resolve the Zeeman splitting it is essential to separate the blue-shifted and red-shifted peaks. Luckily the Zeeman-split line components emitted parallel to the B-field are in two oppositely circularly polarized groups. The two peaks are resolvable if we separate by polarization even with Stark broadening. This "polarization spectroscopy" method was developed, for HEDP gas puff z-pinch situations, at the Weizmann Institute of Science (a Cornell Center collaborator) by Yitzhak Maron et al to be used on Cornell's pulsed power machine COBRA.Experimental results show that the magnetic field measured using the ZPS system confirms that during the implosion phase of the z-pinch all of the machine current is flowing within the radial plasma region known as the magnetic piston, which drives the implosion towards the axis.By examining multiple shots, a current distribution is calculated and the entirety of the machine current is found to be flowing within about 1 mm radially inwards from the piston. This is the first time the current distribution of the imploding gas puff z-pinch has been measured on a 1 MA peak current pulsed power machine.
- 일반주제명
- Plasma physics
- 일반주제명
- High temperature physics
- 일반주제명
- Physics
- 키워드
- Electric field
- 키워드
- Magnetic field
- 기타저자
- Cornell University Electrical and Computer Engineering
- 기본자료저록
- Dissertations Abstracts International. 86-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211152036
■006m o d
■007cr#unu||||||||
■020 ▼a9798384049609
■035 ▼a(MiAaPQ)AAI31335444
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aAngel, Jay Scott.▼0(orcid)0000-0001-5823-4465
■24510▼aDevelopment of the Zeeman Polarization Spectroscopy System on Cobra
■260 ▼a[Sl]▼bCornell University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a227 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-03, Section: B.
■500 ▼aAdvisor: Hammer, David.
■5021 ▼aThesis (Ph.D.)--Cornell University, 2024.
■520 ▼aAn imploding gas puff z-pinch is the magnetic compression of a cylindrical plasma along the central axis. This implosion occurs when an axial current parallel to the z-axis creates a magnetic field outside the cylinder. As the magnetic pressure increases the cylinder compresses radially, ideally forming the z-pinch along the axis.The density and temperature at pinch time can be very high and for this reason some private companies are exploring z-pinches to produce fusion energy. The magnetic field profile responsible for the z-pinch is inherently dependent on the distribution of the current within the plasma. Currently, probes used to measure the magnetic field distribution, and from that the current distribution, are easily destroyed by the high energy density plasma (HEDP) produced in the process. Therefore it would be beneficial to develop a spectroscopic means to measure the magnetic field as the z-pinch develops.A magnetic field (B-field) splits atomic energy levels, causing spectral lines to split. The B-field magnitude determines the splitting and therefore, by measuring the spectrum, one can determine the B-field. The Stark (electric field) broadening of spectral lines is substantial in dense plasma, with multi-nm width, and for typical fields of 5 T, the Zeeman splitting, as measured by the Zeeman Polarization Spectroscopic (ZPS) system, is only fractions of a nm. In order to resolve the Zeeman splitting it is essential to separate the blue-shifted and red-shifted peaks. Luckily the Zeeman-split line components emitted parallel to the B-field are in two oppositely circularly polarized groups. The two peaks are resolvable if we separate by polarization even with Stark broadening. This "polarization spectroscopy" method was developed, for HEDP gas puff z-pinch situations, at the Weizmann Institute of Science (a Cornell Center collaborator) by Yitzhak Maron et al to be used on Cornell's pulsed power machine COBRA.Experimental results show that the magnetic field measured using the ZPS system confirms that during the implosion phase of the z-pinch all of the machine current is flowing within the radial plasma region known as the magnetic piston, which drives the implosion towards the axis.By examining multiple shots, a current distribution is calculated and the entirety of the machine current is found to be flowing within about 1 mm radially inwards from the piston. This is the first time the current distribution of the imploding gas puff z-pinch has been measured on a 1 MA peak current pulsed power machine.
■590 ▼aSchool code: 0058.
■650 4▼aPlasma physics
■650 4▼aHigh temperature physics
■650 4▼aPhysics
■653 ▼aZeeman Polarization Spectroscopic system
■653 ▼aElectric field
■653 ▼aCylindrical plasma
■653 ▼aMagnetic field
■690 ▼a0759
■690 ▼a0597
■690 ▼a0605
■71020▼aCornell University▼bElectrical and Computer Engineering.
■7730 ▼tDissertations Abstracts International▼g86-03B.
■790 ▼a0058
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162640▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
