A high-resolution soft x-ray spectrometer on the MAST tokamak

M.J. Nelson, Robin Barnsley, Francis Keenan, H. Meyer, David Bunting, Patrick Carolan, N.J. Conway, Grace Cunningham, I. Lehane, M.R. Tournianski

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


A curved crystal spectrometer in Johann configuration has been implemented on MAST to obtain values for electron temperature, ion temperature and toroidal velocity. The spectrometer is used to examine medium Z impurities in the soft x-ray region by utilising a Silicon (111) crystal, bent using a 4 pin bending jig, and a CCD detector (Deltat=8 ms). Helium-like Argon emissions from 3.94 to 4.00 Angstrom have been examined using a crystal radius of 859.77 mm. The Bragg angle and crystal radius can be adjusted with relative ease. The spectrometer can be scanned toroidally and poloidally to include a radial view which facilitates absolute velocity measurements by assuming radial velocity =0. Doppler shifts of 2.3x10(-5) Angstrom (1.8 kms(-1)) can be measured. The line of sight is shared with a neutral particle analyzer, which enables in situ ion temperature comparisons. Ray tracing has been used for the development of new imaging spectrometers, using spherical/toroidal crystals, planned to be implemented on MAST. (C) 2004 American Institute of Physics.
Original languageEnglish
Pages (from-to)3734-3736
Number of pages3
JournalReview of Scientific Instruments
Issue number10 II
Publication statusPublished - Oct 2004

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Instrumentation


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