Accession Number : ADA262783


Title :   Analysis of Dynamical Plasma Interactions with High-Voltage Spacecraft. Volume 1


Descriptive Note : Final rept. 31 Dec 1988-31 Dec 1991


Corporate Author : S-CUBED LA JOLLA CA


Personal Author(s) : Mandell, M J ; Luu, T ; Lilley, J ; Jongeward, G ; Katz, I


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a262783.pdf


Report Date : Jun 1992


Pagination or Media Count : 183


Abstract : This volume describes numerous plasma interaction problems done in support of DynaPAC code development, and in support of the SPEAR-II and SPEAR-3 programs. Two dimensional calculations show that oscillations of a beam emitted into an underdense plasma can cause overcharging of a beam emitting rocket, as was observed on MAIMIK. The effects of the sheath instability caused by orbital motion of a positive body are studied, showing that substantial potential oscillations occur, and that the electron current to the probe is enhanced. The plasma response to a sudden application of negative voltage to a probe is studied. It takes a long time to establish an equilibrium sheath, and early time ion currents can be enhanced by an order of magnitude. We calculate currents to the SPEAR-II high voltage probe, explaining the observed difference in probe reading between vacuum and plasma conditions. A one-dimensional model estimates the neutral density required for breakdown of a negative sheath, as proposed for SPEAR-3. We show calculations of the SPEAR-3 rocket floating potentials, collected currents, and current distribution to the particle detectors. Finally, DynaPAC calculations for the sheath structure around the TSS-1 subsatellite are presented.


Descriptors :   *ELECTRON BEAMS , *ELECTRON ENERGY , *ELECTROSTATIC CHARGE , *ROCKETS , *SPACECRAFT CHARGING , *PLASMA SHEATHS , *SPACE CHARGE , IONS , DENSITY , PROBES , MAGNETIC FIELDS , SPACECRAFT , DETECTORS , MODELS , INTERACTIONS , OUTGASSING , HIGH VOLTAGE , INSTABILITY , OSCILLATION , PARTICLES , TWO DIMENSIONAL , PLASMAS(PHYSICS) , ONE DIMENSIONAL , VACUUM , MOTION , VOLTAGE , ELECTRONS


Subject Categories : Electricity and Magnetism
      Particle Accelerators
      Plasma Physics and Magnetohydrodynamics
      Unmanned Spacecraft
      Manned Spacecraft


Distribution Statement : APPROVED FOR PUBLIC RELEASE