Simulations of Energetic-Ion Losses During TAE Activity in DIII--D

Details Simulations of Energetic-Ion Losses During TAE Activity in DIII--D Simulations of Energetic-Ion Losses During TAE Activity in DIII--D

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..dpp..8q10c&link_type=abstract

American Physical Society, Division of Plasma Physics Meeting, November 10-15, 1996, abstract #8Q.10

Physics

Plasma Physics

Scientific paper

The TAE instability is of concern because it can cause large, concentrated losses of fast ions.(H.H. Duong et al.), Nucl. Fusion 33 (1993) 749. To better understand these losses, we compute the expected eigenfunction with the nonvariational ideal-MHD code NOVA and the kinetic antenna code PENN and then use these results as input for the Hamiltonian guiding-center code ORBIT. Fast-ion losses computed by ORBIT are compared with measured^2 losses. The distribution function of lost particles and typical loss orbits are also presented. Preliminary analysis shows that the NOVA-computed mode with an amplitude tilde B_r/B set at ~ 10-4 causes little (<< 1%) or no transport of beam ions, compared to measured losses of ~ 8%.

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