Divertor interferometer diagnostic for ITER

Brower, D. L.; Deng, B. H.; Ding, W. X.
October 2006
Review of Scientific Instruments;Oct2006, Vol. 77 Issue 10, p10E911
Academic Journal
In the harsh environment of the divertor region in ITER, plasmas spanning a huge density range from 1019 to 1022 m-3 are anticipated making measurement of the electron density particularly challenging. For any reasonable wavelength choice, the total phase measured by a conventional two-color interferometer system is always >2Ï€ and therefore subject to fringe counting errors. This problem can be remedied by adding a polarimeter capability whereby the Cotton-Mouton effect is measured or by employing differential interferometry. Using either approach, the total phase is always <2Ï€. The conceptual design of an interferometer system along with possible wavelength choices will be explored.


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