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| Home > Workflow collections > Publication Charges > In situ measurements of the spectral reflectance of metallic mirrors at the H$_α$ line in a low density Ar–H plasma > print |
| 001 | 847895 | ||
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| 100 | 1 | _ | |a Dickheuer, Sven |0 P:(DE-Juel1)165722 |b 0 |e Corresponding author |
| 245 | _ | _ | |a In situ measurements of the spectral reflectance of metallic mirrors at the H$_α$ line in a low density Ar–H plasma |
| 260 | _ | _ | |a [S.l.] |c 2018 |b American Institute of Physics |
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| 520 | _ | _ | |a The efficient and reliable control and monitoring of the quality of the optical properties of mirrors is an open problem in laboratory plasmas. Until now, the measurement of the reflectance of the first mirrors was based on the methods that require additional light calibration sources. We propose a new technique based on the ratio of the red- and blue-shifted emission signals of the reflected hydrogen atoms which enables the in situ measurement of the spectral reflectance of metallic mirrors in low-density Ar–H or Ar–D plasmas. The spectral reflectance coefficients were measured for C, Al, Ag, Fe, Pd, Ti, Sn, Rh, Mo, and W mirrors installed in the linear magnetized plasma device PSI-2 operating in the pressure range of 0.01-0.1 Pa. The results are obtained for the Hα line using the emission of fast atoms induced by excitation of H atoms through Ar at a plasma-solid interface by applying a negative potential U = −80, …, −220 V to the mirror. The agreement between the measured and theoretical data of reflectance is found to be within 10% for the investigated materials (except for C). The spectra also allow us to efficiently determine the material of the mirror. |
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| 773 | _ | _ | |a 10.1063/1.5024995 |g Vol. 89, no. 6, p. 063112 - |0 PERI:(DE-600)1472905-2 |n 6 |p 063112 - |t Review of scientific instruments |v 89 |y 2018 |x 0034-6748 |
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