Objectives
Measurement of line integrated electron density
・Stationary work for real time density feed back
Detectors, Diagnostic Method
| ・ Laser | : | CH3OH 118.8mm CW optically pumped by CO2 laser |
| ・ Interferometer | : | Off axis Michelson, Vibration compensation by HeNe interferometer |
| ・ Detector | : | Liq.He cooled GeGa |
| ・ Phase discriminator | : | 2MHz,1/100Fringe resolution by 200MHz clock |
Specification
| ・ Time resolution | : | 5 ms |
| ・ Spatial resolution | : | Vertical 2 chodes (U1 & U2) |
| ・ Line density resolution | : | 0.94x1017 m-2 |
| ・ Position | : | P-16 section U1 & U2 |
Reference
T.Fukuda and A.Nagashima, "Frequency stabilized single mode cw 118.8mm CH3OH waveguide laser for large tokamak diagnostics" Rev.Sci.Instrum.60(6),June,1989
