Electron density measurements of a field-reversed configuration plasma using a novel compact ultrastable second-harmonic interferometer

Brandi, F.; Giammanco, F.; Harris, W. S.; Roche, T.; Trask, E.; Wessel, F. J.
November 2009
Review of Scientific Instruments;Nov2009, Vol. 80 Issue 11, p113501
Academic Journal
A compact high-sensitivity second-harmonic interferometer for line-integrated electron density measurements on a large plasma machine is presented. The device is based on a fiber coupled near-infrared continuous-wave Nd:YAG laser and is remotely controlled. The performances of the instrument are tested on the Irvine field-reversed configuration machine, and a sensitivity of few 1014 cm-2 in measuring line integrated electron density is demonstrated with a time resolution of a few microseconds. The interferometer is self calibrated, has an impressive stability, and it does not require any further alignment after proper installation. These features make this device a real turn-key system suitable for electron density measurement in large plasma machines.


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