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TJ-II:Interferometry: Difference between revisions
→The Microwave interferometer
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The diagnostic is located in [[TJ-II:Sectors|sector]] B8. | The diagnostic is located in [[TJ-II:Sectors|sector]] B8. | ||
The probing beam has an inclination of 18.7° with respect to the vertical and a frequency of 140 GHz, corresponding to a wavelength of λ = 2.14 mm. | The probing beam has an inclination of 18.7° with respect to the vertical and a frequency of 140 GHz, corresponding to a wavelength of λ = 2.14 mm. | ||
The diagnostic | The line-integrated electron density is deduced from the cumulative phase change of the probing beam and the theoretical length of the intersection of the probing beam with the plasma (obtained from the [[TJ-II:Magnetic coordinates|magnetic geometry]] in vacuum). | ||
The signal is less reliable for high densities (above 2-3 10<sup>19</sup> m<sup>-3</sup>). | === Data description === | ||
The diagnostic delivers a time trace of the line-integrated electron density (65536 points, sampling rate 100 kHz). | |||
In the [[TJ-II:Shot_database|TJ-II database]], the raw data are called 'INTERI', 'INTERQ', and the processed data 'Densidad2_'. | |||
The signal is less reliable for high densities (above 2-3 10<sup>19</sup> m<sup>-3</sup>) due to the cumulative effect of spurious phase jumps. | |||
This time trace is fundamental for machine operation. | This time trace is fundamental for machine operation. | ||