TJ-II:Electron Cyclotron Emission: Difference between revisions

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Specifies that the ECE system is tuned to receive radiation mainly from the HFS of the plasma
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m (Specifies that the ECE system is tuned to receive radiation mainly from the HFS of the plasma)
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by means of a 16 channel heterodyne radiometer,
by means of a 16 channel heterodyne radiometer,
covering the frequency range 50–60 GHz, corresponding to the second harmonic of electron cyclotron emission (ECE) in X-mode polarization at a magnetic field of 0.95 T on the plasma axis.  
covering the frequency range 50–60 GHz, corresponding to the second harmonic of electron cyclotron emission (ECE) in X-mode polarization at a magnetic field of 0.95 T on the plasma axis.  
The measurements are performed from the low field side (LFS) in the horizontal midplane (between [[TJ-II:Sectors|sectors]] C4 and C5, φ = 315°).
The measurements are performed from the low field side (LFS) in the horizontal midplane (between [[TJ-II:Sectors|sectors]] C4 and C5, φ = 315°), but most of the channels receive radiation from the high field side (HFS). In normal operation conditions, the frequency depends on a known way on the magnitude of the magnetic field B. Tuning properly the receiver system, each frequency corresponds to a different value of the major radius ''R'' (according to ''B(R)'').  
Each frequency corresponds to a different value of the major radius ''R'' (according to ''B(R)'').  
The system is operated close to the strong [[TJ-II:Electron Cyclotron Resonant Heating|ECR heating source]] (f<sub>ECRH</sub> = 53.2 GHz).  
The system is operated close to the strong [[TJ-II:Electron Cyclotron Resonant Heating|ECR heating source]] (f<sub>ECRH</sub> = 53.2 GHz).  
To protect the radiometer against stray radiation from the gyrotron, the radiometer band is split into two parts.  
To protect the radiometer against stray radiation from the gyrotron, the radiometer band is split into two parts.  

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