Electron density measurements of a field-reversed configuration plasma using a novel compact ultrastable second-harmonic interferometer
Authors: Brandi F., Giammanco F., Harris W.S., Roche T., Trask E., Wessel F.J.
Autors Affiliation: Department of Physics, University of Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy; Department of Physics and Astronomy, University of California, Irvine, CA 92697, United States; Nanobiotechnology Facility, Italian Institute of Technology, Via Morego 30, 16163 Genova, Italy
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.
Journal/Review: REVIEW OF SCIENTIFIC INSTRUMENTS
Volume: 80 (11) Pages from: 113501-1 to: 113501-4
KeyWords: HIGH TEMPORAL RESOLUTION; DISPERSION INTERFEROMETERDOI: 10.1063/1.3258199