Ion-Probe Current in a Magnetized Plasma

Sato, Masumi

doi:10.1063/1.1693888

Cited by 11 publications

(1 citation statement)

References 6 publications

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“…[Latimer et al, 1970], by the Langmuir probe method, and it is also evaluated from the measurement of the phase velocity of the IA waves. The ion temperature is obtained from Langmuir probe data [Sato, 1972], from the Doppler-broadening of the helium 4686 • line [Sato et al, 1973] and from multigrid electrostatic analyzer measurements (not shown in Figure 1). A split-cylindrical slow-wave structure (4 cm diameter) with several sections along the plasma column is provided for the excitation of waves in the plasma.…”

Section: Basic Experimental Arrangementmentioning

confidence: 99%

Linear wave properties, parametric decay processes, and resulting heating in a bounded magnetized plasma

Bhatnagar¹,

Messiaen²,

Vandenplas³

et al. 1977

Radio Science

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A plasma column along a steady magnetic field is produced by a helical microwave discharge source located at one end of a linear machine. Plasma parameters are: plasma density, 8 × 109—8 × 1010 cm−3; typical electron temperature, 7 eV; magnetic field, 900–2200 Gauss. Waves in the plasma are electrostatically excited by a split‐cylindrical, slow‐wave structure. The frequency domain studied includes the Trivelpiece‐Gould (T‐G) mode (ƒLH < ƒ < ƒpe), the surface wave mode, the electrostatic ion‐cyclotron mode (ƒci < ƒ < ƒLH), and the ion‐acoustic mode (ƒ≲ ƒci). Experimentally observed resonance frequencies in the T‐G mode range and the dispersion curves of the bounded plasma system (ƒ vs. k∥) are in good agreement with the bounded plasma theory for ion‐acoustic waves, the surface wave, electrostatic ion‐cyclotron and T‐G modes. Furthermore, parametric interactions have been studied on the present plasma setup which is characterized by the presence of many normal modes. Two types of resonant parametric instabilities have been simultaneously observed above a certain threshold of the pump power at a frequency ƒp (ƒLH < ƒp « ƒpe). In both processes the electron decay product is a Trivelpiece‐Gould mode. In the first case the ion decay product is an ion‐acoustic (IA) wave (ƒ < ƒci) and electron and ion heating are observed. In the second case the ion decay mode is an ion‐cyclotron (IC) wave (ƒci < ƒ < ƒpi) which is accompanied only by electron heating.

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Section: Basic Experimental Arrangementmentioning

confidence: 99%

Linear wave properties, parametric decay processes, and resulting heating in a bounded magnetized plasma

Bhatnagar¹,

Messiaen²,

Vandenplas³

et al. 1977

Radio Science

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Parametric Decay Processes and Heating in a Bounded Magnetized Plasma

et al. 1977

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Electric probes for plasmas: The link between theory and instrument

Demidov

Ratynskaia

Rypdal

2002

Review of Scientific Instruments

318

369

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Electric probe methods for diagnostics of plasmas are reviewed with emphasis on the link between the appropriate probe theories and the instrumental design. The starting point is an elementary discussion of the working principles and a discussion of the physical quantities that can be measured by the probe method. This is followed by a systematic classification of the various regimes of probe operation and a summary of theories and methods for measurements of charged particle distributions. Application of a single probe and probe clusters for measurements of fluid observables is discussed. Probe clusters permit both instantaneous and time-averaged measurements without sweeping the probe voltage. Two classes of applications are presented as illustrations of the methods reviewed. These are measurements of cross sections and collision frequencies (plasma electron spectroscopy), and measurements of fluctuations and anomalous transport in magnetized plasma.

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Ion-Probe Current in a Magnetized Plasma

Cited by 11 publications

References 6 publications

Linear wave properties, parametric decay processes, and resulting heating in a bounded magnetized plasma

Linear wave properties, parametric decay processes, and resulting heating in a bounded magnetized plasma

Parametric Decay Processes and Heating in a Bounded Magnetized Plasma

Electric probes for plasmas: The link between theory and instrument

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