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 10(14) 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. (C) 2009 American. Institute of Physics. [doi:10.1063/1.3258199]

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

GIAMMANCO, FRANCESCO;
2009

Abstract

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 10(14) 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. (C) 2009 American. Institute of Physics. [doi:10.1063/1.3258199]
Brandi, F; Giammanco, Francesco; Harris, Ws; Roche, T; Trask, E; Wessel, Fj
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/134847
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