6,649 research outputs found
Safety and environmental constraints on space applications of fusion energy
Some of the constraints are examined on fusion reactions, plasma confinement systems, and fusion reactors that are intended for such space related missions as manned or unmanned operations in near earth orbit, interplanetary missions, or requirements of the SDI program. Of the many constraints on space power and propulsion systems, those arising from safety and environmental considerations are emphasized since these considerations place severe constraints on some fusion systems and have not been adequately treated in previous studies
Compensation for nonlinear effects due to high heat flux in thin-film thermometry
Compensation for nonlinear effects due to high heat flux in thin-film thermometr
The NASA-Lewis program on fusion energy for space power and propulsion, 1958-1978
An historical synopsis is provided of the NASA-Lewis research program on fusion energy for space power and propulsion systems. It was initiated to explore the potential applications of fusion energy to space power and propulsion systems. Some fusion related accomplishments and program areas covered include: basic research on the Electric Field Bumpy Torus (EFBT) magnetoelectric fusion containment concept, including identification of its radial transport mechanism and confinement time scaling; operation of the Pilot Rig mirror machine, the first superconducting magnet facility to be used in plasma physics or fusion research; operation of the Superconducting Bumpy Torus magnet facility, first used to generate a toroidal magnetic field; steady state production of neutrons from DD reactions; studies of the direct conversion of plasma enthalpy to thrust by a direct fusion rocket via propellant addition and magnetic nozzles; power and propulsion system studies, including D(3)He power balance, neutron shielding, and refrigeration requirements; and development of large volume, high field superconducting and cryogenic magnet technology
Experimental Observation of Modulation Instability and Optical Spatial Soliton Arrays in Soft Condensed Matter
In this Letter we report observations of optically induced self-organization
of colloidal arrays in the presence of un-patterned counter-propagating
evanescent waves. The colloidal arrays formed along the laser propagation-axis
are shown to be linked to the break-up of the incident field into optical
spatial solitons, the lateral spacing of the arrays being related to modulation
instability of the soft condensed matter system.Comment: 16 pages, 3 figure
National Geodetic Satellite Program /NGSP/ Station Solutions
Results derived from short arc, orbital solution of twelve stations, PAGEOS networ
Superconducting Surface Impedance under Radiofrequency Field
Based on BCS theory with moving Cooper pairs, the electron states
distribution at 0K and the probability of electron occupation with finite
temperature have been derived and applied to anomalous skin effect theory to
obtain the surface impedance of a superconductor under radiofrequency (RF)
field. We present the numerical results for Nb and compare these with
representative RF field-dependent effective surface resistance measurements
from a 1.5 GHz resonant structure
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