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- W2125304028 endingPage "045008" @default.
- W2125304028 startingPage "045008" @default.
- W2125304028 abstract "A novel diagnostic device is developed to obtain spatially resolved emission profiles in plasmas. A ceramic tube is immersed into the plasma and moved along its longitudinal axis. A lens located at the other end of the ceramic tube images light onto an optical fiber which guides the light to a detector. In the case that the plasma emission is detected within a negligible solid angle, simple differentiation of the measured signal yields spatially resolved emission profiles. For non-negligible solid angles, spatial resolution can still be obtained by a more sophisticated evaluation. The design of the probe and the underlying theory are presented. The arrangement of the optics is analyzed in detail. Measurements in an inductively coupled radio-frequency (RF) hydrogen discharge in a GEC cell at different RF powers, neutral gas pressures and axial probe positions are performed. The obtained radial emission profiles of the Balmer-α line exhibit a torus-like structure which reflects the structure of the induced electrical field of the antenna. Furthermore, the transition from H to E mode at lower powers is observed. Based on a corona equilibrium model excitation rates are calculated out of electron energy distribution functions measured by an RF compensated Langmuir probe. A comparison of measured emission profiles with calculated excitation rate profiles shows very good agreement. Integrated emission profiles obtained by camera images are Abel inverted and compared with profiles obtained by the optical probe. The comparison demonstrates the advantage of the optical probe. (Some figures in this article are in colour only in the electronic version)" @default.
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- W2125304028 date "2010-06-11" @default.
- W2125304028 modified "2023-10-16" @default.
- W2125304028 title "A novel probe for spatially resolved emission spectroscopy in plasmas" @default.
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- W2125304028 doi "https://doi.org/10.1088/0963-0252/19/4/045008" @default.
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