Material Type  

 학위논문

 

0017164223

Date and Time of Latest Transaction  

20250211152935

ISBN  

9798346813095

DDC  

629.1

Author  

Konopliv, Mary.

Title/Author  

Fast Optical Emission Spectroscopy for Studying Plasma Behavior in Hall Thrusters.

Publish Info  

[S.l.] : University of California, Los Angeles., 2024

Publish Info  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Material Info  

214 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-06, Section: B.

General Note  

Advisor: Wirz, Richard E.

학위논문주기  

Thesis (Ph.D.)--University of California, Los Angeles, 2024.

Abstracts/Etc  

요약Fast Optical Emission Spectroscopy (FastOES) is a novel diagnostic utilizing measured emission intensities and collisional-radiative modeling to study electron temperature oscillations in Hall thrusters. Advantages include that it is non-invasive, relatively simple, and has potential as an in-flight diagnostic. This dissertation focuses on electron temperature variations related to the breathing mode, a key Hall thruster oscillation around tens of kHz.Key findings reveal that electron temperature oscillations in a Hall thruster can be significant depending on the operating condition and that they are out of phase with the discharge current. Furthermore, an extension of FastOES is utilized to study the phase relationship between ion and neutral populations, providing experimental evidence of the predator-prey relationship between electrons and neutral atoms theorized to drive the breathing mode.Collisional-radiative models (CRMs) are paired with OES measurements to determine the electron temperature. A CRM for xenon is applied in a unique modeling effort to evaluate the accuracy of laser-induced fluorescence (LIF), another Hall thruster diagnostic used for model calibration. The research also explores other spectroscopy applications for Hall thrusters, including imaging cathode species contributions and OES for other species. Overall, this work underscores the complex interactions between electrons, ions, and neutral species in a plasma, and demonstrates the potential of FastOES in plasma propulsion research.

Subject Added Entry-Topical Term  

Aerospace engineering.

Subject Added Entry-Topical Term  

Plasma physics.

Subject Added Entry-Topical Term  

Fluid mechanics.

Index Term-Uncontrolled  

Plasma behavior

Index Term-Uncontrolled  

Fast Optical Emission Spectroscopy

Index Term-Uncontrolled  

Hall thrusters

Index Term-Uncontrolled  

Electron temperature oscillations

Index Term-Uncontrolled  

Laser-induced fluorescence

Added Entry-Corporate Name  

University of California, Los Angeles Aerospace Engineering 0279

Host Item Entry  

Dissertations Abstracts International. 86-06B.

Electronic Location and Access  

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Control Number  

joongbu:657979