Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"Floating Potential"”.
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Kinetic Simulations of Spacecraft Charging and Plasma Interactions in the Solar Wind
… method is integrated into the PIC model so the floating potential can be calculated self-consistently with the PIC code from charges deposited on the surface. We first investigate the photoelectron sheath in the solar wind. Previous analytical studies of monotonic and non-monotonic sheath …
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Construction and operation of a Mirror Langmuir Probe diagnostic for the Alcator C-Mod tokamak
… rapid changes in plasma electron temperature, floating potential and ion saturation current that are associated with plasma turbulence. Moreover, no existing system can provide real-time output of these three parameters using a single electrode. To remedy this limitation, an advanced, …
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Design, Development, and Calibration of an Electric Field Probe for Use on Sounding Rockets
… and bias currents to allow them to reach a floating potential within the plasma. The E-field can be derived from the measurement of the voltage difference between these 2 conductors. The voltage of each conductor can also be referenced to spacecraft chassis to form a Floating Potential Probe …
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A Study into Data Analysis of Varying Types of Langmuir Probes
… is a set of sweeping Langmuir probes on the Floating Potential Measurement Unit (FPMU) that is deployed on-board the International Space Station. We compare the output of NASA’s current data processing algorithm for FPMU to that of our own algorithm. This work shows how instruments degrade …
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Hybrid-PIC modeling and electrostatic probe survey of Hall thrusters
… Also, AC components of discharge current and floating potential were measured. The combined experimental and numerical results are used to examine phenomena such as the nature of low-frequency discharge oscillations, the interaction of the thruster walls with the plasma, the distribution of …
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Langmuir Probe Instrument Suite for Mesosphere Turbulence Experiment Mission
… probes, however these are biased at the same potential in the electron saturation region while each having a different metal electroplated on its surface. This probe not only gives relative plasma density measurements, but is also able to detect the presence of mesospheric smoke particles. The …
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Characterization of low-frequency density fluctuations in dipole-confined laboratory plasmas
Low-frequency fluctuations of plasma density, floating potential, ion saturation current, visible light intensity, and edge magnetic field are routinely observed in the Levitated Dipole Experiment (LDX). For the purposes of this thesis, we define low-frequency as W << Wbe where Wbe is the electron …
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Radio-Frequency Plasma Expansion in Different Magnetic Nozzle Configurations
… measurements of the ion saturation current and floating potential in the plume revealed a negative potential region at the location of maximum ion current along the field lines intersecting the antenna upstream. In the symmetric field case, a high-density conics structure formed downstream of …
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Plasma Properties and Heating at the Anode of a 1 kW Arcjet Using Electrostatic Probes
… (1) obtain axial and azimuthal distributions of floating potential $\phi\sb{\rm f}$, anode sheath potential $\phi\sb{\rm s}$, probe current density at zero volts j$\sb{\rm a}$, electron number density n$\sb{\rm es}$, electron temperature T$\sb{\rm es}$, and anode heating due to electrons …