Classical Interpretation of TFTR Data in Terms of General Equation for Ionization vs. Charge Exchange Requires Non-Classical Ionization.*

Details Classical Interpretation of TFTR Data in Terms of General Equation for Ionization vs. Charge Exchange Requires Non-Classical Ionization.* Classical Interpretation of TFTR Data in Terms of General Equation for Ionization vs. Charge Exchange Requires Non-Classical Ionization.*

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..dpp..4f14s&link_type=abstract

American Physical Society, Division of Plasma Physics Meeting, November 10-15, 1996, abstract #4F.14

Physics

Plasma Physics

Scientific paper

Differential equ. for ionization (IO) vs. charge exch. (CX) gives ions/neutr. density ratio, y = n+ / n0 vs. distance from plasma edge, x: y = [l_CX / ( l_IO - l_CX)] [exp (-l_IO x ) - exp (- l_CX x)]_.....; l_IO and l_CX are mean free paths. Between T(ion)=100 and 39 KeV (core) [1], ion impact ionization rate dominates [2]. In 10-100 KeV range, l_IO / l_CX >= 10. Eq.(1) predicts y=0.01, i.e. upper limit to plasma particle conf. time τ <= 10 μs. To explain reported (not measured) τ = 0.18s requires additional (non-classical) ionization =10 σ_IO. Without it, ignition of a beam heated DT plasma below 120 KeV would be impossible in principle. The absence of evidence for thermonuclear neutrons suggests a beam-on-target experiment; ``target'' = recycled hydrogenous deposits from TFTR walls. Submitted to Phys. Rev. Lett. as Comment (5/30/95) 1. R.J. Hawryluk et al., PRL 72, 3530 and 3526 (1994) 2. Atomic Data Bank, Div. Phys. and Chem. Sci., IAEA, Vienna

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