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CH spectroscopy for carbon chemical erosion analysis in high density low temperature hydrogen plasma
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FIG. 1.

values calculated with HYDKIN and the inverse of the effective photon efficiencies measured in Pilot-PSI by relating the CH emission to the methane flux injected into hydrogen plasma. The shows a steep decrease over orders of magnitude over the range . The measured inverse effective photon efficiencies are constant within the error bars in the same temperature range.

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FIG. 2.

Schematic of the seeding experiments in Pilot-PSI. Hydrogen plasma that exits the cascaded arc plasma source (Ref. 11) at sonic speed is confined by 0.4 T magnetic field into a beam. Thomson scattering measures radial profiles of and at 18 mm in front of the target (Ref. 12) Typical conditions for the present experiments: , , and 12 mm full profile widths. is injected into the center of the plasma column through the 1 mm diameter channel in the passively cooled copper target at a rate of . The temperature of the injection channel is set by the plasma power between 100 and (estimated from calorimetry on the target cooling water). The CH molecular band head at 431 nm is measured along a perpendicular and a tangential view.

Image of FIG. 3.

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FIG. 3.

Emission profile of the CH band measured in the perpendicular view near the Pilot-PSI upon seeding hydrogen plasma with methane at a flow rate of . The insets illustrate the penetration depth of the excited CH into the plasma: -folding length in axial and in radial direction.

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/content/aip/journal/apl/95/15/10.1063/1.3238295
2009-10-12
2014-04-18

Abstract

The CH molecular band is measured upon seeding the hydrogen plasma in the linear plasma generator Pilot-PSI [electron temperature and electron density ] with methane. Calculated inverse photon efficiencies for these conditions range from 3 up to due to a steeply decreasing electron excitation cross section. The experiments contradict the calculations and show a constant effective inverse photon efficiency of for . The discrepancy is explained as the CH level is populated through dissociative recombination of the molecular ions formed by charge exchange. Collisional de-excitation is observed for and . These results form a framework for in situcarbonerosion measurements in future fusion reactors such as ITER.

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Scitation: CH spectroscopy for carbon chemical erosion analysis in high density low temperature hydrogen plasma
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/15/10.1063/1.3238295
10.1063/1.3238295
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