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FIDA Diagnostic

FIDA Diagnostic. Diagnostic for FAST IONS : it measures the vertical component of perpendicular energy Processes generating fast ions Beam ICRH heating Nuclear reaction. beam + plasma ions. beam + plasma e. CXRS. Collisional ionization. beam ion. + beam. plasma neutrals

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FIDA Diagnostic

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  1. FIDA Diagnostic Diagnostic for FAST IONS : it measures the vertical component of perpendicular energy Processes generating fast ions Beam ICRH heating Nuclear reaction

  2. beam + plasma ions beam + plasma e CXRS Collisional ionization beam ion + beam plasma neutrals (halo neutrals) CXRS Re- neutrals Beam-Plasma Interaction 2

  3. Da emission from neutrals

  4. Radiation signal Da from Re-neutrals ONLY signal to analyze

  5. PROTOTYPE INSTRUMENT Wavelenght range is  = 6470 - 6630 Å Spectral Resolution: 5 Å 5

  6. CONTAMINANTS IN THE SPECTRUM

  7. Fitting of a theoretical response function • The theoretical response function radiated by the impurity is the convolution of: • the Gaussian line shape radiated by the impurity • the instrumental response (taken by illuminating the fibers with a neon lamp and represented by the sum of three Gaussians)

  8. Spectrum from re-neutrals • Born by CXRS fast ions-beam • Not Maxwellain distribution function • Da spectrum much broader with a non- Gaussian shape

  9. Rotational velocity • Measurement vector with parallel and orthogonal direction to magnetic field • Doppler shift • Ion energy con • For view line orthogonal to B

  10. vz vz a) b) Fast ion Fast ion j B B For view line orthogonal to B • For vz = 2.4 106 m/s --> Ez = 60 KeV a) b) Any value of Any ion with energy

  11. The success of FIDA is based on • Vertical views ( Doppler shift only due to gyromotion of fast ions) • Blocking bar ( avoiding CCD saturation) • Beam modulation ( for substructing background) • High quantum efficiency CCD ( for good S/N)

  12. Spectrometers + CCD: characteristics

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