Feasibility of using neural networks and other optimization algorithms to obtain cross sections from electron-swarm data. Final report, June-October 1989
Three kinds of numerical optimization algorithms have been investigated for use in estimating the electron momentum transfer and excitation cross sections for atoms and molecules based on measured electron transport, or swarm data. The methods investigated are the downhill or creeping simplex; simulated annealing; and neural networks. These methods have been used to obtain the cross section for momentum transfer for a model system from E/N (Electric field, E, divided by the total gas density, N) dependent drift velocities and characteristic energies. In addition the creeping simplex has been used to obtain momentum transfer cross sections for the He and Ar and the momentum transfer cross section and a vibrational excitation cross section for methane from measured drift velocity and characteristic energy data. A neural network has been used to obtain an estimate of the momentum transfer cross section of xenon in the vicinity of the Ramsauer minimum from swarm data. These results serve as examples of what may be possible using these and, perhaps other optimization algorithms.
- Research Organization:
- Kinema Research, Monument, CO (USA)
- OSTI ID:
- 5986980
- Report Number(s):
- AD-A-226692/2/XAB; CNN: F33615-86-C-2171
- Country of Publication:
- United States
- Language:
- English
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99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
ARGON
CHARGED-PARTICLE TRANSPORT
ALGORITHMS
ELECTRONS
ENERGY LOSSES
HELIUM
METHANE
XENON
ANNEALING
ATOMS
CALCULATION METHODS
CROSS SECTIONS
DATA PROCESSING
DENSITY
ELECTRIC FIELDS
ELECTRON TRANSFER
ELECTRON-ATOM COLLISIONS
ELECTRON-MOLECULE COLLISIONS
EXCITATION
FEASIBILITY STUDIES
MATHEMATICAL MODELS
MOMENTUM TRANSFER
NEURAL NETWORKS
NUMERICAL SOLUTION
OPTIMIZATION
PROGRESS REPORT
VELOCITY
ALKANES
ATOM COLLISIONS
COLLISIONS
DOCUMENT TYPES
ELECTRON COLLISIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY-LEVEL TRANSITIONS
FERMIONS
FLUIDS
GASES
HEAT TREATMENTS
HYDROCARBONS
LEPTONS
LOSSES
MATHEMATICAL LOGIC
MOLECULE COLLISIONS
NONMETALS
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PROCESSING
RADIATION TRANSPORT
RARE GASES
654001* - Radiation & Shielding Physics- Radiation Physics
Shielding Calculations & Experiments
990200 - Mathematics & Computers