Plasma Diagnostics by Neutral Beam Probing

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概要

• 論文の詳細を見る

• A new method using both techniques of a neutral beam and spectroscopy has been developed to measure the spatial electron density profile of a plasma. This neutral beam probing technique utilizes the photons emitted by impact excitation of the probing lithium beam with plasma electrons. The spatial electron density distribution of the plasma of T_e∿10eV, n_e∿10^11cm^<-3> has been determined from the measurements of the local photon flux and beam intensity by using the excitation rate coefficient calculated from the available cross section data. The comparison of these results with those of conventional methods proves this new method is of practical use in the space-resolved measurements of plasma parameters, especially when a Langmuir probe is no longer usable. The cross sections for excitation of the Li beam in collisions with He, Ar and H_2 have been also measured and used to estimate the neutral lithium beam intensity.

• 核融合科学研究所の論文

著者

• FUJITA Junji

  Research Information Center, Institute of Plasma Physics, Nagoya University

• KADOTA Kiyoshi

  Department of Electronics, Nagoya University

• Kadota K

  Department Of Electronics Nagoya University

• Kadota Kiyoshi

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Tsuchida Kazuki

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Kawasumi Yoshiaki

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Kawasumi Yoshiaki

  Research Information Center Institute Of Plasma Physics Nagoya University

関連論文

• Observation of Mode-Converted Ion Bernstein Wave by an HCN Laser Scattering
• Formation of C_2 Radicals in High-Density C_4F_8 Plasmas Studied by Laser-Induced Fluorescence
• Enhancement of Surface Productions of CF_x Radicals by the Addition of H_2 into CF_4 Plasmas
• Loss Processes of F Atoms in Low-Pressure, High-Density CF_4 Plasmas with the Admixture of H_2
• Surface Kinetics of CF_x Radicals and Fluorine Atoms in the Afterglow of High-Density C_4F_8 Plasmas
• Lifetime Measurements of CF_x Radicals and H Atoms in Afterglow of CF_4/H_2 Plasmas
• Loss Processes of CF and CF_2 Radicals in the Afterglow of High-Density CF_4 Plasmas
• Estimation of Carbon Fluxes Interchanging between Chamber Wall and Gas Phase in Fluorocarbon Plasmas
• Synthesis of Heavy Carbon Clusters by Laser Ablation in Vacuum
• Spatial Distribution of H Atom Density in High-Density, Helicon-Wave H_2 Plasmas Measured by Laser-Induced Fluorescence
• Formation of Positive and Negative Carbon Cluster Ions in the Initial Phase of Laser Ablation in Vacuum
• Role of Reaction Products in F^- Production in Low-Pressure, High-Density CF_4 Plasmas
• Diagnostics of Fluorine Negative Ions by Laser Photodetachment Combined with a Heated Probe in High-Density CF_4 Plasmas
• Efficient Production of O^- by Dissociative Attachment of Slow Electrons to Highly Excited Metastable Oxygen Molecules
• Time-of-Flight Mass Spectrometry of Positive Ions in Helicon-Wave Excited High-Density CF_4 and C_4F_8 Plasmas
• Characteristics of Fluorine Negative Ions in Helicon-Wave Excited High-Density Carbon-Tetrafluoride Plasmas (負イオン特集)
• Neutralization Method for detection of Metastable Ions and Its Application to the Production of Metastable Rare Gas Ions by Electron Impact
• New Lens System Using Toroidal Magnetic Field for Intense Ion Beam
• Formation of Metastable State Molecular Ions by Electron Impact of N_2, CO, O_2 and NO
• Space-Resolved Measurement of Electron Density by Neutral Li Beam Probing in NBT
• Measurement of the Magnetic Field in a Plasma Using an Impurity Probe Spectroscopy
• The Hydrogen Balmer-α Line Profile in RF-Discharge Plasmas
• Plasma Diagnostics by Neutral Beam Probing
• Comparison of the Fluorine Atom Density Measured by Actinometry and Vacuum Ultraviolet Absorption Spectroscopy
• Decay Processes of Electrons in the Afterglow of High-Density CF_4, c-C_4F_8 and CF_4-H_2 Plasmas
• Collisional Quenching of C_2(d^3Π_g) and C^3(A^1〜Π_u) and Its Application to the Estimation of Absolute Particle Density in Laser-Ablation Carbon Plumes
• Secondary Electron Ejection from Contaminated Metal Surface by He and Ar Atoms
• Observation of Stark Spectra of Argon High Rydberg States in Well-Defined Electric Fields by Laser-Induced Fluorescence-Dip Spectroscopy
• Correlation between Metastable and Ground-State Fluorine Atom Densities Measured by Laser-Induced Fluorescence and Vacuum Ultraviolet Absorption Spectroscopies : Nuclear Science, Plasmas, and Electric Discharges

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