Interferometer in Divertor Region

To measure the line integral electron density in the divertor region.

[Detectors, Diagnostic Method]
A mm-wave interferometer with two probing frequencies using heterodyne detection.

Source frequencies : 217 and 183 GHz
Source power : 11 (217GHz) and 15 (183GHz) mW
Measuring chords : 3 chords
Position : P-4 section, U1-2A and U2-2A ports

H. Takenaga et al., Review of Scientific Instruments, Vol.69 (1998) 3181.