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

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Description

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 ... continued below

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3.2 MB pages

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Paul, S.F.; Cates, C.; Mauel, M.; Maurer, D.; Navratil, G. & Shilov, M. August 9, 2004.

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Description

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.

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3.2 MB pages

Notes

INIS; OSTI as DE00828607

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  • Other Information: PBD: 9 Aug 2004

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  • Report No.: PPPL-3994
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/828607 | External Link
  • Office of Scientific & Technical Information Report Number: 828607
  • Archival Resource Key: ark:/67531/metadc786058

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Creation Date

  • August 9, 2004

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • June 10, 2016, 6 p.m.

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Paul, S.F.; Cates, C.; Mauel, M.; Maurer, D.; Navratil, G. & Shilov, M. A High-Speed Optical Diagnostic that uses Interference Filters to Measure Doppler Shifts, report, August 9, 2004; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc786058/: accessed November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.