Superconducting film injected by ions from pulsed energetic dense plasma source

Feng-Zhi, Xu; Geng-Hua, Chen; Qian-Sheng, Yang; Maofu, Ye; Li, Yinan

doi:10.1088/1009-1963/10/11/311

Cited by 3 publications

(1 citation statement)

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“…The theta-pinch concept is one of the most widely used inductive plasma source designs ever developed. It has established a workhorse reputation within many research circles, including thin films and material surface processing, [1][2][3] fusion, [4][5][6] high-power space propulsion, 7,8 and academia, 9,10 filling the role of not only a simply constructed plasma source but also that of a key component. In superconductive thin films, theta-pinch ionization has been used as an electrodeless alternative ion injection source.…”

Section: Introductionmentioning

confidence: 99%

On the delayed gas breakdown in a ringing theta-pinch with bias magnetic field

Meeks

Rovey

2012

Physics of Plasmas

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A single particle model and particle-in-cell simulations are used to elucidate the breakdown physics in a ringing theta-pinch with a bias magnetic field. Previous experimental results show that gas breakdown occurs when the bias magnetic field is nullified by the theta-pinch magnetic field. The analyses presented here agree with the experimental results and show that electron kinetic energy does not exceed the ionization threshold of deuterium until the net magnetic field is approximately zero. Despite the presence of a strong electric field, the gyromotion of electrons within the bias magnetic field prevents them from gaining energy necessary to ionize the gas. Parametric analysis of the peak electron energy as a function of the bias and pre-ionization magnetic fields reveals that: (1) when the bias magnetic field is %97% of the pre-ionization magnetic field, peak electron energies are highly erratic resulting in poor overall ionization, and (2) full ionization with repeatable behavior requires a pre-ionization to bias magnetic field ratio of approximately 2 to 1 or higher.

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Section: Introductionmentioning

confidence: 99%

On the delayed gas breakdown in a ringing theta-pinch with bias magnetic field

Meeks

Rovey

2012

Physics of Plasmas

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Structures and magnetic anisotropy of β-Mn ₂ V ₂ O ₇ crystals synthesized by the molten salt method

Zhou¹,

Liu²,

Ding

2009

Chinese Phys. B

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β-Mn2V2O7 crystals with strip shape are successfully prepared by the molten salt method in a closed crucible, and are characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area of electron diffraction (SAED) and high-resolution transmission electron microscopy (HRTEM). The results indicate that the sample is of the β-Mn2V2O7 crystal with monoclinic symmetry, level natural cleavage facets and directional growth. Magnetic properties are measured by vibration sample magnetometry (VSM) at room temperature, and the magnetic hysteresis loop indicates that the β-Mn2V2O7 has anti-ferromagnetic properties with low coercive force and remnant magnetization. The magnetic measurement results in different directions exhibit that the β-Mn2V2O7 has magnetic anisotropy, which is due to the fact that the magnetic interaction energy of the β-Mn2V2O7 is lowest only when the electron configuration is in a certain direction.

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Numerical and experimental efforts to explain delayed gas breakdown in 0-pinch devices with bias magnetic field

Meeks

Rovey

2012

48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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A single particle model and particle-in-cell simulations have been used to elucidate the breakdown physics in a ringing theta-pinch with a bias magnetic field. Previous experimental results show that gas breakdown occurs when the bias magnetic field is nullified by the theta-pinch magnetic field. The analyses presented here agree with the experimental results and show that electron kinetic energy does not exceed the ionization threshold of deuterium until the net magnetic field is approximately zero. Despite the presence of a strong electric field, the gyromotion of electrons within the bias magnetic field prevents them from gaining energy necessary to ionize the gas. Parametric analysis of the peak electron energy as a function of the bias and pre-ionization magnetic fields reveals that:(1) when the bias magnetic field is ≈ 97% of the pre-ionization magnetic field, peak electron energies are highly erratic resulting in poor overall ionization, and (2) full ionization with repeatable behavior requires a pre-ionization to bias magnetic field ratio of approximately 2 to 1 or higher. Efforts to better characterize this phenomena experimentally are ongoing. However some preliminary findings using a dual-probe cancellation technique are presented.

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Superconducting film injected by ions from pulsed energetic dense plasma source

Cited by 3 publications

References 0 publications

On the delayed gas breakdown in a ringing theta-pinch with bias magnetic field

On the delayed gas breakdown in a ringing theta-pinch with bias magnetic field

Structures and magnetic anisotropy of β-Mn ₂ V ₂ O ₇ crystals synthesized by the molten salt method

Numerical and experimental efforts to explain delayed gas breakdown in 0-pinch devices with bias magnetic field

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Superconducting film injected by ions from pulsed energetic dense plasma source

Cited by 3 publications

References 0 publications

On the delayed gas breakdown in a ringing theta-pinch with bias magnetic field

On the delayed gas breakdown in a ringing theta-pinch with bias magnetic field

Structures and magnetic anisotropy of β-Mn 2 V 2 O 7 crystals synthesized by the molten salt method

Numerical and experimental efforts to explain delayed gas breakdown in 0-pinch devices with bias magnetic field

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Structures and magnetic anisotropy of β-Mn ₂ V ₂ O ₇ crystals synthesized by the molten salt method