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Sensitivity of Thomson Scattering Measurements on Electron Distribution Modeling in Low-Density RFP Plasmasby A. Fassina, P. Bílkova, P. Bohm, and P. Franz
A numerical method which relies on Thomson scattering data for the identification and analysis of electron distributions is presented and discussed; the method is developed within the framework of Bayes probability theory. Use of this method on Reversed Field eXperiment (RFX)-mod low-density data supports the proposition that suprathermal tails cause systematic asymmetries in electron temperature profiles. In the limits of signal and spectral resolution of the diagnostic, a semiquantitative analysis is carried on; the presence of nonthermal (NT) populations is found to be consistent with runaway/slideaway plasma conditions. In low-density discharges NT e− presence is compatible with the presence of kinetic dynamo and can contribute to configuration sustainment. more...
An electric solar sail (E-sail) is a recent propulsion technology concept capable of reaching the edge of the Heliosphere. An E-sail consists of a set of bare tethers at high positive/negative bias capable of deflecting solar wind protons to produce thrust. The propulsive force calculation for a single tether was focused on outer planet missions, considering the characteristic plasma ambient at 1 astronomical unit. However, both ion and electron temperature and plasma density cover a wide range of values within the Heliosphere. Propulsive forces are determined here for the solar wind plasma within the entire Heliosphere. Results show that propulsive forces increase with ion temperature, whereas decrease with electron temperature. In addition, propulsive forces do increase with plasma density despite the sheath decreases. more...
Emergence of Novel Multipactor Modes Under Standing Wave Conditions in a Coaxial Line With an RF Windowby Thomas W. Hall, Prabhakar Bandaru, and Daniel Rees
The multipactor (MP) phenomenon can generate exponentially increasing electron populations in RF vacuum systems, leading to components becoming damaged. This paper uses numerical methods to analyze an RF vacuum window in a coaxial line under various standing wave conditions. Our methods are first benchmarked against the analytic and experimental results for the traveling wave and the numerical results for standing waves that were found in previous work. Second, the effect of standing waves on electron motion in the axial direction is discussed and related to electron trajectories in the presence of an RF window. It is found that standing waves with the magnetic maximum located behind the RF window lead to window collisions that can affect MP depending on the power, frequency, and conductor radii. For a low number of window collisions, MP was highly predictable by earlier work, but as the percentage of collisions occurring on the window surpassed approximately 50%, a novel mode of MP emerged to dominate the phenomenon. more...
A PUBLICATION OF THE IEEE NUCLEAR AND PLASMA SCIENCES SOCIETY
|MARCH 2019 | VOLUME 47 | NUMBER 3 | ITPSBD | (ISSN 0093-3813)|
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