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Measurement and Characterization of ...

Swanson, Charles Pendleton Stuntz.

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Measurement and Characterization of Fast Electron Creation, Trapping, and Acceleration in an RF-coupled High-mirror-ratio Magnetic Mirror.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Measurement and Characterization of Fast Electron Creation, Trapping, and Acceleration in an RF-coupled High-mirror-ratio Magnetic Mirror./
作者:	Swanson, Charles Pendleton Stuntz.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	308 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-05, Section: B.
Contained By:	Dissertations Abstracts International80-05B.
標題:	Plasma physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10936331
ISBN:	9780438536241

Measurement and Characterization of Fast Electron Creation, Trapping, and Acceleration in an RF-coupled High-mirror-ratio Magnetic Mirror.
Swanson, Charles Pendleton Stuntz.

Measurement and Characterization of Fast Electron Creation, Trapping, and Acceleration in an RF-coupled High-mirror-ratio Magnetic Mirror. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 308 p.

Source: Dissertations Abstracts International, Volume: 80-05, Section: B.

Thesis (Ph.D.)--Princeton University, 2018.

This item must not be sold to any third party vendors.

The PFRC-II in seed plasma mode is a tandem magnetic mirror. In one end cell is a low-power double-saddle antenna which produces cold (5 eV), tenuous (1011 /cm3) plasma. Using x-ray pulse-height detectors to probe a previously unmeasured energy range of electrons, I measure a component with temperatures up to 3 keV. I characterize their life cycle, including a Fermi-Ulam-like acceleration process which allows them to attain energies in excess of 30 keV. The fast electrons are born at 300 - 600 eV temperature in one end via secondary electron emission through an RF sheath. These electrons consist of < 1% of the plasma density, yet receive a large portion of the power. The phenomenon pushes models of a similar system, materials processing reactors, into lower-pressure and more-magnetized regimes, with implications on power balance and surface charging. The electrons enter the center cell in the loss cone. There, even though the commonly used adiabatic parameter is small, ρe[Special character omitted]B/B << 1, they accumulate and persist for hundreds of transits due to the non-adiabaticity of magnetic moment. The same dynamics also lead to de-trapping in magnetic mirror-based fusion reactors. Under low-pressure conditions, ∼ 10% of these electrons are accelerated still further, up to 3 keV temperature, some electrons above 30 keV, by a form of Fermi-Ulam acceleration. I measure a voltage oscillation consistent with two-stream instability caused by electrons from the last end cell re-entering as a beam. Non-adiabaticity of magnetic moment is essential to destroy resonances between mirror transit time and oscillation period, destroying barriers in phase space. I compare the proposed mechanisms to approximate models. The proposed mechanism for creation is compared to an approximate kinetic model which includes confinement by a plasma-terminating plate with a fluctuating potential. The proposed mechanism for accumulation in the center cell is compared to the nonlinear-resonance overlap model of Chirikov, and ground-truthed with a Boris algorithm simulation. The proposed mechanism for their acceleration is compared to an energy diffusion model. Their mechanism for Fermi-Ulam voltage fluctuation is compared to a nonlinear saturation model. The mechanism for resonance breaking is compared to a 2D numerical map model.

ISBN: 9780438536241Subjects--Topical Terms:

3175417
Plasma physics.

Measurement and Characterization of Fast Electron Creation, Trapping, and Acceleration in an RF-coupled High-mirror-ratio Magnetic Mirror.
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500 $a Source: Dissertations Abstracts International, Volume: 80-05, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
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506 $a This item must not be sold to any third party vendors.
520 $a The PFRC-II in seed plasma mode is a tandem magnetic mirror. In one end cell is a low-power double-saddle antenna which produces cold (5 eV), tenuous (1011 /cm3) plasma. Using x-ray pulse-height detectors to probe a previously unmeasured energy range of electrons, I measure a component with temperatures up to 3 keV. I characterize their life cycle, including a Fermi-Ulam-like acceleration process which allows them to attain energies in excess of 30 keV. The fast electrons are born at 300 - 600 eV temperature in one end via secondary electron emission through an RF sheath. These electrons consist of < 1% of the plasma density, yet receive a large portion of the power. The phenomenon pushes models of a similar system, materials processing reactors, into lower-pressure and more-magnetized regimes, with implications on power balance and surface charging. The electrons enter the center cell in the loss cone. There, even though the commonly used adiabatic parameter is small, ρe[Special character omitted]B/B << 1, they accumulate and persist for hundreds of transits due to the non-adiabaticity of magnetic moment. The same dynamics also lead to de-trapping in magnetic mirror-based fusion reactors. Under low-pressure conditions, ∼ 10% of these electrons are accelerated still further, up to 3 keV temperature, some electrons above 30 keV, by a form of Fermi-Ulam acceleration. I measure a voltage oscillation consistent with two-stream instability caused by electrons from the last end cell re-entering as a beam. Non-adiabaticity of magnetic moment is essential to destroy resonances between mirror transit time and oscillation period, destroying barriers in phase space. I compare the proposed mechanisms to approximate models. The proposed mechanism for creation is compared to an approximate kinetic model which includes confinement by a plasma-terminating plate with a fluctuating potential. The proposed mechanism for accumulation in the center cell is compared to the nonlinear-resonance overlap model of Chirikov, and ground-truthed with a Boris algorithm simulation. The proposed mechanism for their acceleration is compared to an energy diffusion model. Their mechanism for Fermi-Ulam voltage fluctuation is compared to a nonlinear saturation model. The mechanism for resonance breaking is compared to a 2D numerical map model.
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