(ITERP/06) Performance Assessment of ITER-FEAT

**Abstract.** A performance assessment for ELMy H-mode operation of ITER-FEAT
mainly at the nominal plasma current of 15 MA is made by using 1.5D
transport codes PRETOR and ASTRA. Operation domain analysis is performed for
various transport assumptions. Sensitivities to density profile, the ratio
of ion thermal diffusivity to electron thermal diffusivity
/ and the ion heating fraction are
investigated. It is shown that, under rather conservative assumptions, 400
MW operation with fusion gain Q = 10 should be achievable. Operations with
lower and higher fusion power are explored and an operation range of
200 600MW is obtained. A probabilistic performance assessment
is also done by using 0D modeling. The ``maximized conditional probability
(MCP)'' to reach Q larger than a specified lower bound is estimated
considering the beta limit
2.5, L-H transition
threshold power and density limit
n_{e}/n_{GR} 0.85. The MCP of
achieving
Q 10 is about 70%, and the MCP of
Q 50 is about 30% when the HH factor distribution is a Gaussian with
= 20%. By increasing the plasma current to 17 MA, the MCPs of
achieving
Q 10 and
Q 50 increase to 85% and
50%, respectively.

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*IAEA 2001*