Absolute wavelength calibration of a Doppler spectrometer with a custom Fabry-Perot optical system

M. M. Baltzer, D. Craig, D. J. Den Hartog, T. Nishizawa, M. D. Nornberg

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

An Ion Doppler Spectrometer (IDS) is used for fast measurements of C VI line emission (343.4 nm) in the Madison Symmetric Torus. Absolutely calibrated flow measurements are difficult because the IDS records data within 0.25 nm of the line. Commercial calibration lamps do not produce lines in this narrow range. A light source using an ultraviolet LED and etalon was designed to provide a fiducial marker 0.08 nm wide. The light is coupled into the IDS at f/4, and a holographic diffuser increases homogeneity of the final image. Random and systematic errors in data analysis were assessed. The calibration is accurate to 0.003 nm, allowing for flow measurements accurate to 3 km/s. This calibration is superior to the previous method which used a time-averaged measurement along a chord believed to have zero net Doppler shift.

Original languageEnglish
Article number11E509
JournalReview of Scientific Instruments
Volume87
Issue number11
DOIs
Publication statusPublished - Nov 1 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Instrumentation

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