In situ wavelength calibration of the edge CXS spectrometers on JET

E. Delabie, N. Hawkes, T. M. Biewer, M. G. O'Mullane

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A method for obtaining an accurate wavelength calibration over the entire focal plane of the JET edge CXS spectrometers is presented that uses a combination of the fringe pattern created with a Fabry-Pérot etalon and a neon lamp for cross calibration. The accuracy achieved is 0.03 Å, which is the same range of uncertainty as when neglecting population effects on the rest wavelength of the CX line. For the edge CXS diagnostic, this corresponds to a flow velocity of 4.5 km/s in the toroidal direction or 1.9 km/s in the poloidal direction.

Original languageEnglish
Article number11E525
Pages (from-to)1-3
Number of pages3
JournalReview of Scientific Instruments
Issue number11
Early online date15 Aug 2016
Publication statusPublished - 1 Nov 2016


  • wavelength calibration
  • JET edge charge exchange
  • spectrometer


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