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Title: Field directed sputter sharpening (FDSS) data.


Abstract not provided.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
McDonnell Academy Global Energy and Environmental Partnership Fellowship
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Country of Publication:
United States

Citation Formats

Minas, Scott C. Field directed sputter sharpening (FDSS) data.. United States: N. p., 2017. Web.
Minas, Scott C. Field directed sputter sharpening (FDSS) data.. United States.
Minas, Scott C. Wed . "Field directed sputter sharpening (FDSS) data.". United States. doi:.
title = {Field directed sputter sharpening (FDSS) data.},
author = {Minas, Scott C},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}

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  • Two disparate topics concerning electron precipitation were studied. First, a theoretical model for the diurnal modulation of quiet time electron precipitatation was constructed. Second, sounding rocket electric and magnetic field data were analyzed. ULF fluctuations were exhibited by the data gathered as the payload traversed an electron precipitation boundary, which constituted the edge of an auroral arc. The model included the effects of rotating asymmetries in the geomagnetic field, a uniform dawn to dusk convection electric field and pitch angle diffusion of outer radiation belt electrons. Results were that electron precipitation for geographic locations within the South Atlantic Anomaly weremore » not modulated by the electric field. Precipitation at longitudes outside the anomaly should exhibit a small diurnal modulation. These results agree qualitatively but not quantitatively with sounding rocket precipitation data. The ULF fluctuations were found to have been the electric and magnetic field manifestations of hydromagnetic waves. Various wave properties were computed and analyzed. Many instabilities are studied with the most likely source mechanism having been the electrostatic or electromagnetic Kelvin-Helmholtz instability.« less
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  • This research extends the work begun by Enyeart (1994) which evaluated the process of intrinsic bioremediation, and which developed a model for predicting the velocity of an aerobic degradation front, as it traverses the length of a JP-4 contaminant plume. In the present work, Enyeart`s model was validity tested by comparing its output prediction with field measured values. A methodology was developed to compare the model output with field measured data. The results were analyzed, and the results of this first stage of validity testing show a reasonable basis for accepting the model.
  • In this dissertation the possibility that chaos and simple determinism are governing the dynamics of reversed field pinch (RFP) plasmas is investigated. To properly assess this possibility, data from both numerical simulations and experiment are analyzed. A large repertoire of nonlinear analysis techniques is used to identify low dimensional chaos in the data. These tools include phase portraits and Poincare sections, correlation dimension, the spectrum of Lyapunov exponents and short term predictability. In addition, nonlinear noise reduction techniques are applied to the experimental data in an attempt to extract any underlying deterministic dynamics. Two model systems are used to simulatemore » the plasma dynamics. These are the DEBS code, which models global RFP dynamics, and the dissipative trapped electron mode (DTEM) model, which models drift wave turbulence. Data from both simulations show strong indications of low dimensional chaos and simple determinism. Experimental date were obtained from the Madison Symmetric Torus RFP and consist of a wide array of both global and local diagnostic signals. None of the signals shows any indication of low dimensional chaos or low simple determinism. Moreover, most of the analysis tools indicate the experimental system is very high dimensional with properties similar to noise. Nonlinear noise reduction is unsuccessful at extracting an underlying deterministic system.« less
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