Determination of Electron Density and Ionic Temperature of Laser Produced Plasma on Polymeric Materials

Determination of Electron Density and Ionic Temperature of Laser Produced Plasma on Polymeric Materials PDF Author:
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ISBN:
Category :
Languages : en
Pages : 4

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Electron Density and Temperature Determination of a Laser-induced Plasma in Hydrogen Gas

Electron Density and Temperature Determination of a Laser-induced Plasma in Hydrogen Gas PDF Author: David H. Plemmons
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ISBN:
Category : Electron distribution
Languages : en
Pages : 186

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The Electron Density and Temperature in the Photoionized Background Gas (N2) Surrounding a Laser Produced Plasma

The Electron Density and Temperature in the Photoionized Background Gas (N2) Surrounding a Laser Produced Plasma PDF Author: A. W. Ali
Publisher:
ISBN:
Category :
Languages : en
Pages : 26

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A scheme is presented for the determination of the electron density and temperature in a background gas surrounding a laser produced plasma. The background gas (N2) is photoionized by the ionizing radiation from the laser produced plasma. Band intensities of 3914A and 3371A from N2(+) and N2 are utilized for the determination of the state of the background plasma. (Author).

Determination of Spatial and Temporal Electron Density and Temporal Electron Temperature in Laser-Produced Gaseous Deuterium Plasmas

Determination of Spatial and Temporal Electron Density and Temporal Electron Temperature in Laser-Produced Gaseous Deuterium Plasmas PDF Author: Winston Kent Pendleton (III.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 101

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The temporal and spatial electron density distribution and the temporal variation of electron temperature have been determined in gaseous deuterium plasmas produced by a laser. In addition to these measurements, made during laser irradiation of the plasma, the plasma growth rate, laser-plasma absorption and reflection interaction, and pressure dependence of laser intensity breakdown threshold have been determined. A time-variable reflectivity ruby laser with a pulse duration of 4 nanoseconds was employed in these experiments at gas pressures from 100 to 600 torr. The electron density and temperature measurements represent a major addition to the data available on laser-produced plasmas. (Author).

Determination of Spatial and Temporal Electron Density and Temporal Electron Temperature in Laser-produced Gaseous Deuterium Plasmas

Determination of Spatial and Temporal Electron Density and Temporal Electron Temperature in Laser-produced Gaseous Deuterium Plasmas PDF Author: Winston Kent Pendleton
Publisher:
ISBN:
Category : Deuterium
Languages : en
Pages : 224

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Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports PDF Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 892

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A New Diagnostic Technique to Simultaneously Measure the Electron Temperature, Ionic Charge State, and Plasma Density Near the Critical Surface in Laser-plasma Interaction Experiments. Final Report

A New Diagnostic Technique to Simultaneously Measure the Electron Temperature, Ionic Charge State, and Plasma Density Near the Critical Surface in Laser-plasma Interaction Experiments. Final Report PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 23

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We have studied the dependence of the second harmonic signature of the ion acoustic decay instability on the target material in laser produced plasmas. Well-defined Stokes peaks were observed. The Stokes peaks were especially sharp for high Z targets. The threshold of the IADI was quite low even in high Z plasma. It increased only weakly with increasing the atomic number. On the other hand, the Stokes intensity decreased strongly with increasing atomic number. Linear theory, combined with the results of hydrodynamic-computer-simulation (LASNEX) calculation, explained our experimental results fairly well. The effective laser intensity is strongly reduced by the increased collisionaldamping of electron plasma wave in high Z plasma, so that the Stokes intensity was reduced strongly. Hence, strong electron heating due to the IADI is less likely in high Z plasma. On the other hand, in the context of the threshold, the collisional damping effect of the electron plasma wave is canceled due to the opposite trend of the damping of the ion acoustic wave which decreases with ZT{sub e}/T{sub i}. The low-threshold, and the sharp and steady spectrum make the IADI a good diagnostic of local plasma conditions near the critical surface for high Z plasma. The ionic charge state Z is estimated by measuring the ion acoustic wave frequency of the most unstable wave excited by the IADI. For Mo plasma, we had measured value of Z=30. We can also estimate the plasma density of the instability region using Bohm-Gross dispersion relation of the plasma wave. We have obtained plasma density N{sub e}/N{sub c} = 0.86. We have estimated plasma flow effects on the LADI by measuring the angular distribution of the IADI emission. Our results indicate that the flow effect is not important for the IADI in our experiments.

A New Diagnostic Technique to Simultaneously Measure the Electron Temperature, Ionic Charge State, and Plasma Density Near the Critical Surface in Laser-plasma Interaction Experiments

A New Diagnostic Technique to Simultaneously Measure the Electron Temperature, Ionic Charge State, and Plasma Density Near the Critical Surface in Laser-plasma Interaction Experiments PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 23

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Book Description
We have studied the dependence of the second harmonic signature of the ion acoustic decay instability on the target material in laser produced plasmas. Well-defined Stokes peaks were observed. The Stokes peaks were especially sharp for high Z targets. The threshold of the IADI was quite low even in high Z plasma. It increased only weakly with increasing the atomic number. On the other hand, the Stokes intensity decreased strongly with increasing atomic number. Linear theory, combined with the results of hydrodynamic-computer-simulation (LASNEX) calculation, explained our experimental results fairly well. The effective laser intensity is strongly reduced by the increased collisionaldamping of electron plasma wave in high Z plasma, so that the Stokes intensity was reduced strongly. Hence, strong electron heating due to the IADI is less likely in high Z plasma. On the other hand, in the context of the threshold, the collisional damping effect of the electron plasma wave is canceled due to the opposite trend of the damping of the ion acoustic wave which decreases with ZT{sub e}/T{sub i}. The low-threshold, and the sharp and steady spectrum make the IADI a good diagnostic of local plasma conditions near the critical surface for high Z plasma. The ionic charge state Z is estimated by measuring the ion acoustic wave frequency of the most unstable wave excited by the IADI. For Mo plasma, we had measured value of Z=30. We can also estimate the plasma density of the instability region using Bohm-Gross dispersion relation of the plasma wave. We have obtained plasma density N{sub e}/N{sub c} = 0.86. We have estimated plasma flow effects on the LADI by measuring the angular distribution of the IADI emission. Our results indicate that the flow effect is not important for the IADI in our experiments.

Plasmas at High Temperature and Density

Plasmas at High Temperature and Density PDF Author: Heinrich Hora
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ISBN:
Category : High temperature plasmas
Languages : en
Pages : 468

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NBS Special Publication

NBS Special Publication PDF Author:
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 476

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