TJ-II:Electron Cyclotron Emission: Difference between revisions

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Updated reference links
(Added wikpedia link)
(Updated reference links)
 
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== Calibration ==
== Calibration ==
The system is calibrated absolutely by comparing room temperature with liquid nitrogen temperature.  
The system is calibrated absolutely by comparing room temperature with liquid nitrogen temperature.  
<ref name="Luna">[http://link.aip.org/link/?RSINAK/72/379/1 E. de la Luna, J. Sánchez, V. Tribaldos, and T. Estrada, ''Multichannel electron cyclotron emission radiometry in TJ-II stellarator'', Rev. Sci. Instrum. '''72''', 379 (2001)]</ref>
<ref name="Luna">E. de la Luna, J. Sánchez, V. Tribaldos, and T. Estrada, ''Multichannel electron cyclotron emission radiometry in TJ-II stellarator'', [[doi:10.1063/1.1315636|Rev. Sci. Instrum. '''72''', 379 (2001)]]</ref>
<ref>[http://dx.doi.org/10.1016/S0920-3796(00)00492-0 E. de la Luna et al, ''Electron cyclotron emission measurements on TJ-II stellarator plasmas'', Fusion Engineering and Design '''53''', Issues 1-4 (2001) 147-151]</ref>
<ref>E. de la Luna et al, ''Electron cyclotron emission measurements on TJ-II stellarator plasmas'', [[doi:10.1016/S0920-3796(00)00492-0|Fusion Engineering and Design '''53''', Issues 1-4 (2001) 147-151]]</ref>
The optical system and the transmission line of the ECE diagnostic were designed to allow the calibration to be performed outside the vacuum vessel keeping the arrangement of the diagnostic.
The optical system and the transmission line of the ECE diagnostic were designed to allow the calibration to be performed outside the vacuum vessel keeping the arrangement of the diagnostic.
To calibrate, the transmission line is opened close to the diagnostic port (C5-bottom). Then the port flange, which holds the optical system and the wave-guide up to that point, is extracted from the torus and assembled with the same alignment outside the vacuum vessel.
To calibrate, the transmission line is opened close to the diagnostic port (C5-bottom). Then the port flange, which holds the optical system and the wave-guide up to that point, is extracted from the torus and assembled with the same alignment outside the vacuum vessel.
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The emission can be simulated by the [[TRECE]] ray tracing code.
The emission can be simulated by the [[TRECE]] ray tracing code.
<ref name="Tribal">[http://dx.doi.org/10.1088/0029-5515/36/3/I02 V. Tribaldos and B. P. van Milligen, ''Electron cyclotron emission calculations for TJ-II stellarator'', Nucl. Fusion '''36''', 283 (1996)]</ref>
<ref name="Tribal">V. Tribaldos and B. P. van Milligen, ''Electron cyclotron emission calculations for TJ-II stellarator'', [[doi:10.1088/0029-5515/36/3/I02|Nucl. Fusion '''36''', 283 (1996)]]</ref>


The local radiation temperature is assumed to be a function only of the local electron temperature at the resonant layer; however, if the plasma is not Maxwellian or if the plasma is optically thin, the measured radiation temperature is no longer equal to the electron temperature.   
The local radiation temperature is assumed to be a function only of the local electron temperature at the resonant layer; however, if the plasma is not Maxwellian or if the plasma is optically thin, the measured radiation temperature is no longer equal to the electron temperature.   

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