Temperature and density measurements of the 4s 3 P 2 argon metastable atom level in a weakly diffusion ionized argon plasma are presented and discussed. The steady state collisionless unmagnetized plasma is generated at a gas pressure of 50 mPa, extruded by hot filament DC discharges and diffused in a chamber of about 40 l volume. The temperature is measured from the absorption linewidth and the density from the spectral absorption coefficient of a low-cost single-mode diode laser (801 479 nm) by scanning its frequency around the 4s 3 P 2 -4p 3 D 2 ArI transition.
The paper concerns the microwave reflection method suitable for the diagnostics of a plasma column placed transversely across a rectangular waveguide for a TE10 wave. VSWR and phase measurement results are presented regarding the complex reflection coefficient of a discharge Neon diode Philips K50A used as a positive column in the 2–11 Gc/s band. A reflection coefficient theory of cylindrical dielectric post having two coaxial layers of different dielectric permittivity, has also been presented and checked with measurements on calibrated dielectric rods. A numerical calculation of the complex coefficient of reflection performed in the 2–11 Gc/s band is presented for conventional plasma parameters along with a radial electron density distribution depending on a paraboloidal function. The computed values fit the measurement results within the experimental errors.
Articles you may be interested inTemperature diagnostics of ECR plasma by measurement of electron bremsstrahlung Rev. Sci. Instrum. 83, 073111 (2012); 10.1063/1.4738642 The impact of plasma-wall interaction on the gas mixing efficiency in electron cyclotron resonance ion sourcea) Rev. Sci. Instrum. 83, 02A348 (2012); 10.1063/1.3680547 Electron cyclotron resonance plasma photosa) Rev. Sci. Instrum. 81, 02B708 (2010); 10.1063/1.3267289 Role of low charge state ions in electron cyclotron resonance ion source plasmas Rev. Sci. Instrum. 71, 623 (2000)Experimental results, interpreted by a theoretical model based on the first two hydrodynamic equations, concerning parametric resonance instabilities in argon and neon dc discharges are presented. These instabilities were detected by scattered microwaves in the frequency band 2-40 GHz when the plasma positive column was pierced across a rectangular waveguide, by measuring time-modulation enhancement due to striation eigenmodes built-up in plasmas.
A technique for fast characterization, through Langmuir probe diagnostics, of a steady state plasma perturbed by a repetitive UHF wave train is presented. By opening an instantaneous narrow window a! a given de!ay synchm.nous!y wi !h respect to the frequency of the periodic pulse modulation, an averaged sample of the probe current is memorized while the probe potential is slowly sweeped. A Langmuir characteristic is then integrated and displayed. The use of this technique for the display of temporal and spatial profiles of the electron density and temperature in a UHF pulsed, low-temperature plasma experiment is described. The Langmuir probe measurements were performed both inside the pulse duration time and in the interval between two successive DUIS~S.
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