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Fast Ion Transport Options in TRANSP

Fast Ion Transport Options in TRANSP. Presented at Energetic Particle SFG Meeting, PPPL June 16 2009 – D. McCune. Preliminary: TRANSP Web Documentation. TRANSP website: http://w3.pppl.gov/TRANSP “TRANSP HELP” web page: http://w3.pppl.gov/~pshare/help/transp.htm

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Fast Ion Transport Options in TRANSP

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  1. Fast Ion Transport Options in TRANSP Presented at Energetic Particle SFG Meeting, PPPL June 16 2009 – D. McCune

  2. Preliminary: TRANSP Web Documentation • TRANSP website: http://w3.pppl.gov/TRANSP • “TRANSP HELP” web page: http://w3.pppl.gov/~pshare/help/transp.htm • This describes the subset of the TRANSP namelist known to interest users. • One can search for substring “difb” to get information on fast ion transport model options. This will be updated.

  3. Anomalous Transport Options • At present only “ad hoc” modeling options are available in NUBEAM and TRANSP. • A Monte Carlo transport operator implements: • The diffusion and velocity can be input as profile functions of time and radial flux coordinate– input “Ufile” or MDS+ signals. • Can apply to beam ions and/or fusion product ions.

  4. Transport Options (2) • If “Ufile” signals are not provided, the fast ion diffusivity can be set by namelist. • Usually a step function in time. • An assumption of proportionality to electron particle diffusivity exists– probably not useful. • Namelist controls allow introduction of energy dependence. • No pitch angle dependence • No spatial localization of energy dependence.

  5. Model Applications • It’s a crude, simple model– suggestions for improvement are welcome. • Some doubt about a method driven purely by prescribed input data… • It has been used as a “knob” to affect global fast ion confinement, adjust neutron rate simulation to match experiment. • E. Ruskov wrote papers showing upper limits on fast ion diffusion, on TFTR.

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