Determination of spatial energy deposition in e-beam-pumped laser cells by pressure measurements

Journal Article · Thu May 01 00:00:00 EDT 1980 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.328018· OSTI ID:5371329

Eckstrom, D J; Walker, Jr, H C

A significant fraction of the energy deposited by electron beams in gases results in heating of the gas, which causes a transient pressure rise in the cell. When the pressure rise is uniform across the height and length of the cell, but varies across the depth, one-dimensional unsteady flow theory applies. Then a fast-response pressure measurement at the back wall of the cell can be interpreted to give the initial spatial pressure distribution. We describe the relationship between time and space coordinates for both low and medium levels of excitation in the cell. Experiments are discussed which illustrate the application of this technique. Analytical predictions using the SANDYL 3-D electron scattering code show basic agreement with the experimental results, but indicate some areas for improvements in the calculations. Intermediate-response pressure measurements are shown to be inadequate to determine the local deposition when the deposition varies markedly across the cell.

• Research Organization: Molecular Physics Laboratory, SRI International, Menlo Park, California 94025
• DOE Contract Number: ES-78-C-05-5606
• OSTI ID: 5371329
• Journal Information: J. Appl. Phys.; (United States), Vol. 51:5
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
GAS LASERS
ENERGY ABSORPTION
DATA
ELECTRON BEAMS
ENERGY LOSSES
EXCITATION
GAS FLOW
GASES
MATHEMATICAL MODELS
PRESSURE MEASUREMENT
TRANSIENTS
ABSORPTION
BEAMS
ENERGY-LEVEL TRANSITIONS
FLUID FLOW
FLUIDS
INFORMATION
LASERS
LEPTON BEAMS
LOSSES
PARTICLE BEAMS
420300* - Engineering- Lasers- (-1989)