The Dynamics of Electrons in Linear Plasma Devices and Its Impact on Plasma Surface Interaction by Michael Hubeny

Author:Michael Hubeny
Language: eng
Format: epub, pdf
ISBN: 9783030125363
Publisher: Springer International Publishing

The two-dimensional Thomson spectrum after subtracting plasma background and laser stray-light is shown in Fig. 6.8 on the left, while two example spectra are shown on the right. The initial iCCD resolution was reduced to 64 by 64 pixels corresponding to a spatial resolution of 2.3 mm and a spectral resolution of 0.455 nm. With the matching two-dimensional Raman spectrum, the pixel lines of each spectra are paired up and the density is then determined via Eq. 6.1. Temperature and density are already adjusted by the deconvolution.

The error estimate for the temperature is based on the 95% confidence intervals in a least-squares Gaussian fitting routine with the least-absolute-residuals option (increasing robustness of fit) enabled in MATLAB™. Since for high photon numbers the Poisson distribution used for photon (shot) noise estimates approaches the Gaussian distribution, the standard deviation is used for the weighting of the spectrum. To estimate the density error, a combination of fitting error and for Raman and Thomson spectra is used. The width of the excluded area in the center is determined by the deviation between RS model and measurement, since the signal levels are higher and less stray-light and no plasma background are present.

Fig. 6.8Two-dimensional TS spectrum (left) and example fits and results at two radial positions (right) at a radial resolution of 2.3 mm

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