NASA Scientific and Technical Aerospace Reports

sites for arc inception are triple-junctions, even though some arcs were initiated in gaps between cells. It is also shown that
the arc rate increases with increasing of ion collection current. The analysis of optical spectra (240-800 nm) reveals intensive
narrow atomic lines (Ag, H) and wide molecular bands (OH, CH, SiH, SiN) that confirms a complicated mechanism of arc
plasma generation. The results obtained seem to be important for the understanding of the arc inception mechanism, which
is absolutely essential for progress toward the design of high-voltage solar array for space application.
Author
Solar Arrays; Vacuum Chambers; Low Earth Orbits; Earth Orbital Environments; CCD Cameras; Mass Spectrometers;
Plasma Density; Pulse Duration
20040111117 Princeton Univ., NJ
Analytical and Numerical Studies of the Complex Interaction of a Fast Ion Beam Pulse with a Background Plasma
Kaganovich, I. D.; Startsev, E. A.; Davidson, R. C.; Nov. 2003; In English
Report No.(s): DE2004-820212; PPPL-3909; No Copyright; Avail: National Technical Information Service (NTIS)
Plasma neutralization of an intense ion beam pulse is of interest for many applications, including plasma lenses, heavy
ion fusion, high energy physics, etc. Comprehensive analytical, numerical, and experimental studies are underway to
investigate the complex interaction of a fast ion beam with a background plasma. The positively charged ion beam attracts
plasma electrons, and as a result the plasma electrons have a tendency to neutralize the beam charge and current. A suite of
particle-in-cell codes has been developed to study the propagation of an ion beam pulse through the background plasma.
NTIS
Plasma Control; Ion Beams
20040111118 Princeton Univ., NJ
Coil Tolerance Impact on Plasma Surface Quality for NCSX
Brooks, A.; Oct. 2003; In English
Report No.(s): DE2004-820107; PPPL-3885; No Copyright; Avail: National Technical Information Service (NTIS)
The successful operation of the National Compact Stellarator Experiment (NCSX) machine will require producing plasma
configurations with good flux surfaces, with a minimum volume of the plasma lost to magnetic islands or stochastic regions.
The project goal is to achieve good flux surfaces over 90% of the plasma volume. NCSX is a three period device designed
to be operated with iota ranging from (approx.) 0.4 on axis to (approx.) 0.7 at the edge. The field errors of most concern are
those that are resonant with 3/5 and 3/6 modes (for symmetry preserving field errors) and the 1/2 and 2/3 modes (for symmetry
breaking field errors).
NTIS
Stellarators; Plasma Control
20040111122 Princeton Univ., NJ
Plasma Science Contribution to the SCaLeS Report
Jardin, S. C.; Oct. 2003; In English
Report No.(s): DE2004-820082; PPPL-3879; No Copyright; Avail: National Technical Information Service (NTIS)
In June of 2003, about 250 computational scientists and mathematicians being funded by the DOE Office of Science met
in Arlington, VA to attend a 2-day workshop on the Science Case for Largescale Simulation (SCaLeS). This document was
the output of the Plasma Science Section of that workshop. The conclusion is that exciting and important progress can be made
in the field of Plasma Science if computer power continues to grow and algorithmic development continues to occur at the
rate that it has in the past. Full simulations of burning plasma experime nts could be possible in the 5-10 year time frame if
an aggressive growth program is launched in this area.
NTIS
Navigation Technology Satellites; Algorithms; Combustion
20040111126 Lawrence Livermore National Lab., Livermore, CA
Modeling of Direct Beam Extraction for a High-Charge-State Fusion Driver
Anderson, O. A.; Logan, B. G.; Mar. 19, 2001; 22 pp.; In English
Report No.(s): DE2004-15007298; UCRL-JC-142538; No Copyright; Avail: Department of Energy Information Bridge
A newly proposed type of multicharged ion source offers the possibility of an economically advantageous high-chargestate
fusion driver. Multiphoton absorption in an intense uniform laser focus can give multiple charge states of high purity,
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