A High-Speed Optical Diagnostic that uses Interference Filters to Measure Doppler Shifts

Paul, S.F. ; Cates, C. ; Mauel, M. ; Maurer, D. ; Navratil, G. ; Shilov, M.

Princeton University. Plasma Physics Laboratory.

关键词: Time Resolution;    Amplitudes;    Fibers;    70 Plasma Physics And Fusion Technology;    Diagnostics;   

DOI  :  10.2172/828607
RP-ID  :  PPPL-3994
RP-ID  :  AC02-76CH03073
RP-ID  :  828607

美国|英语

来源: UNT Digital Library

【 摘 要 】

A high-speed, non-invasive velocity diagnostic has been developed for measuring plasma rotation. The Doppler shift is determined by employing two detectors that view line emission from the identical volume of plasma. Each detector views through an interference filter having a passband that varies linearly with wavelength. One detector views the plasma through a filter whose passband has a negative slope and the second detector views through one with a positive slope. Because each channel views the same volume of plasma, the ratio of the amplitudes is not sensitive to variations in plasma emission. With suitable knowledge of the filter characteristics and the relative gain, the Doppler shift is readily obtained in real time from the ratio of two channels without needing a low throughput spectrometer. The systematic errors--arising from temperature drifts, stability, and frequency response of the detectors and amplifiers, interference filter linearity, and ability to thoroughly homogenize the light from the fiber bundle--can be characterized well enough to obtain velocity data with + or - 1 km/sec with a time resolution of 0.3 msec.