Research Needs for Magnetic Fusion Energy Sciences - US Burning ...

itER-at aRiES-i aRiES-at
b n (%) 3.0 3.2 5.4
i bootstrap /i plasma 0.48-0.68 0.68 0.89
n/n Gr 1.0 1.04 0.95
q cyl , q 95 3.8-4.5 4.4 3.0
z eff 1.4-2.0 1.73 1.83
P rad core /Pinput 0.2-0.3 0.48 0.36
P rad div /Pinput 0.43
(P alpha + P input – P rad core ) /a p , mW/m 2 0.14 0.45 0.56
(P alpha + P input – P rad core ) /P input 1.36 2.52 6.25
P alpha /P input 1 3.8 8.8
, mW/m 2 0.6 2.5 3.3
t J , s 200-400 300 275
duration, s 3000 ~3x10 7 ~3x10 7
h diffusion depth (m) 4x10 -5 0.61
Wall temperature, o k 400 700-1300
Table 2. Key Parameters for ITER and Reactor Designs.
validatEd thEoRy aNd pREdictivE ModEliNg:
RESEaRch REquiREMENtS
Overall goal: Through developments in theory and modeling, and careful comparison with experiments,
develop a set of computational models that are capable of predicting all important
plasma behavior in the regimes and geometries relevant for practical fusion energy.
two general areas of importance for meeting this Fesac goal were identified by the ReneW panel.
gap: in the past, there has been no separate funding effort for predictive modeling and validation
within the Us fusion energy sciences program. instead, such efforts have been supported as
a portion of larger experimental or model development activities. The panel believes that successful
development of a validated predictive capability will require a more dedicated and focused effort
than currently exists within the program.
gap: The panel recognized that the integration of a high-performance steady-state plasma with
a demo-relevant wall/divertor solution and the demonstration of fully steady-state disruptionfree
operations will not be possible in iteR, but is nonetheless essential for proceeding beyond
iteR. Thus, in addition to being of use in planning and executing experiments on iteR, predictive
modeling capabilities are needed to investigate and resolve integration issues for a demo reactor.
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