TJ-II:Interferometry: Difference between revisions
→Two-colour interferometer
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== Two-colour interferometer == | == Two-colour interferometer == | ||
The double wavelength heterodyne interferometer (CO<sub>2</sub>: 10.6 μm, | The double wavelength heterodyne interferometer (CO<sub>2</sub>: 10.6 μm, NdYAG: 1.064 μm) | ||
provides values of the plasma line integral density in scenarios with average densities ranging from a few times 10<sup>18</sup> m<sup>–3</sup> to more than 5×10<sup>19</sup> m<sup>–3</sup>. The results have been compared with those from the 2 mm (microwave) interferometer, obtaining an excellent agreement. Working with a final bandwidth of 4 kHz, a one pass line integral error level about ±2×10<sup>17</sup> m<sup>–2</sup> has been achieved. | provides values of the plasma line integral density in scenarios with average densities ranging from a few times 10<sup>18</sup> m<sup>–3</sup> to more than 5×10<sup>19</sup> m<sup>–3</sup>. The results have been compared with those from the 2 mm (microwave) interferometer, obtaining an excellent agreement. Working with a final bandwidth of 4 kHz, a one pass line integral error level about ±2×10<sup>17</sup> m<sup>–2</sup> has been achieved. | ||
<ref>[http://link.aip.org/link/?RSINAK/72/96/1 H. Lamela et al, ''Laser interferometric experiments for the TJ-II stellarator electron-density measurements'', Rev. Sci. Instrum. '''72''', 96 (2001)]</ref> | <ref>[http://link.aip.org/link/?RSINAK/72/96/1 H. Lamela et al, ''Laser interferometric experiments for the TJ-II stellarator electron-density measurements'', Rev. Sci. Instrum. '''72''', 96 (2001)]</ref> | ||