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Report No.

Toroidal interferometer/polarimeter density measurement system for long pulse operation on ITER

Kondoh, Takashi; Kawano, Yasunori; Costley, A. E.*; Malaquias, A.*; Sugie, Tatsuo; Walker, C.*

In order to measure line average electron density for long pulse operation on ITER, a CO$$_{2}$$ laser interferometer/polarimeter system has being selected. High reliability is necessary because the measurements will be used as a reference signal for real time control of the density during long plasma pulses. The design of the interferometer/polarimeter is improved from the previous design because of an input from experiences gained on JT-60U. A dual CO$$_{2}$$ laser interferometer/polarimeter was chosen in order to improve reliability. The proof-of-principle test of the dual CO$$_{2}$$ laser interferometer/polarimeter has been demonstrated and the system is operating routinely on JT-60U. Five tangential sight lines are designed near the midplane of ITER. The laser beams will be transmitted to the plasma through shielding labyrinths in an equatorial port and reflected by retroreflectors. Position of the laser beams will be remotely controlled by steering mirrors outside the port plug because the vacuum vessel of ITER will move due to change in temperature during long plasma pulses.



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