- By:
- Delabie, Ephrem G; Hawkes, N.; Biewer, Theodore M; O'Mullane, M. G.
- Journal Name:
- Review of Scientific Instruments
- Volume:
- 87
- Issue Number:
- 11
- Publication Date:
- December 27, 2023
- View DOI Listing:
- https://doi.org/10.1063/1.4960306
Abstract
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.
