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Implications of EFIT Accuracy on Divertor Probe Data Analysis

Explore the impact of EFIT accuracy on interpreting divertor probe data and particle flux measurements. Understand issues like sudden signal jumps, ion saturation current measurement, and challenges in EFIT reconstruction. Learn how to determine particle flux with precision. S. Jachmich's insights from TFE meetings offer valuable information.

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Implications of EFIT Accuracy on Divertor Probe Data Analysis

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  1. Implications of EFIT accuracy on Divertor probe data S. Jachmich Task-Force E-meeting 25/02/04

  2. Comparison of two identical pulses: • 2 Problems: • ITOT and OTOT larger in recent pulse • sudden jump(s) of signal 53080 and 58718 Particle flux inn. divertor KY4D/ITOT Particle flux out. divertor KY4D/OTOT Neutral beam power Gas-puff

  3. B Divertor Tile Probe Pin R,Z Z,R  How is particle flux to divertor target surface determined?: • measure ion saturation current of individual probe k q

  4. Ion saturation and electron density is not affected: a = probe angle = 11-13 deg.

  5. S. Jachmich, TFE-meeting 20/02/04 Effect of XLOC and EFIT reconstr. on angles: old pulse with XLOC (q=1.3 deg) new pulse with EFIT (q = 2.4 deg) => Jsurf by a factor of 2-3 larger!!

  6. S. Jachmich, TFE-meeting 20/02/04 EFIT reconstruction fails sometimes: • no X-point reconstructed • local magnetic field line angles increase from 2 deg to 10 deg

  7. S. Jachmich, TFE-meeting 20/02/04 Summary: • meas. of particle fluxes to surface are very sensitive to quality of reconstruction • XLOC-angles have become unvailable from C5 on (after Feb. 2002) • all pulses before 54346 have been done with XLOC • (=> ITOT,OTOT systematically smaller) • comparison of pulses still possible by reprocessing the pulses • and using EFIT solely

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