PPPL-3178 is available in <a href="PPPL-3178.pdf">pdf</a> or 
<a href="PPPL-3178.ps">postscript</a> formats.
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<b>The Effect of Toroidal Field Ripple on Confined Alphas in TFTR D-T Plasmas</b>


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Authors:         H. Duong, et al.



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The Pellet Charge Exchange (PCX) diagnostic on the Tokamak Fusion Test
Reactor (TFTR) presently measures trapped alpha distribution functions with
very small pitch angle (v||/v ~ 0.05) at the midplane. The measured PCX
alpha signal exhibits a depletion region near the outboard region. Results
of the alpha energy spectra and radial profile suggest stochastic ripple
diffusion is the cause of the depletion. Comparison of the ripple
stochastization boundary with Goldston-White-Boozer theory also shows the
correct functional dependence on alpha energy and q-profile.
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