TJ-II:Multifilter electron temperature diagnostic

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A multifilter electron temperature diagnostic is under development at TJ-II. [1] [2] [3] [4] Its purpose is to obtain multichord electron temperature measurements in high density plasmas, where the Electron Cyclotron Emission diagnostic is inoperative due to cutoff. This widely used technique is based on the determination of Te from the ratio of the SXR fluxes passing through filters of different thickness, assuming a Maxwellian electron energy distribution. The plasma impurity content plays an important role, since the presence of line radiation may distort the continuum SXR spectra.

See also


  1. D. Baião, F. Medina, M.A. Ochando, et al., Implementation of multifilter based twin-prototypes for core electron temperature measurements in the TJ-II stellarator, Rev. Sci. Instrum. 81 (2010) 10D711
  2. D. Baião, F. Medina, M.A. Ochando, et al., Sensitivity of central electron temperature estimations with the multi-foil diagnostic to profile transitions in TJ-II NBI-heated plasmas, 38th EPS Conference on Plasma Physics (2011) P1.049
  3. D. Baião, F. Medina, M. Ochando, K. McCarthy, F. Tabarés et al., Central electron temperature estimations of TJ-II neutral beam injection heated plasmas based on the soft x ray multi-foil technique, Rev. Sci. Instrum. 83 (2012) 053501
  4. D. Baião, F. Medina, M. Ochando, I. Pastor, C. Varandas, A. Molinero, and J. Chércoles, Implementation of a multichannel soft x-ray diagnostic for electron temperature measurements in TJ-II high-density plasmas, Rev. Sci. Instrum. 83 (2012) 10E104