Preliminary results from the Alcator C-Mod polarimeter

Xu, P.; Irby, J. H.; Bergerson, W. F.; Bosco, J.; Brower, D. L.; Ding, W. X.; Kanojia, A.; Leccacorvi, R.; Mansfield, D. K.; Marmar, E. S.; Michael, P.; Murray, R.; Rokhman, Y.; Vieira, R.
October 2010
Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D507
Academic Journal
A poloidally viewing far infrared polarimeter diagnostic is being developed for the Alcator C-Mod tokamak, and will be used to determine the q-profile and to study density and magnetic field fluctuations. A three-chord version of what will eventually be up to a ten-chord system has been designed and fabricated and will be installed on C-Mod before the end of the current run period. Bench tests of a single chord mock-up of this system show acceptable noise levels for the planned measurements. We will discuss the analysis and experimental techniques used to diagnose and reduce noise sources.


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