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Report No.
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Design of microfission chamber for ITER operations

Ishikawa, Masao; Kondoh, Takashi; Nishitani, Takeo; Kusama, Yoshinori

Micro-fission chambers (MFCs) are one of the most important diagnostics to measure the fusion power in ITER. The MFCs for high power operation (measurement range: fusion power of 100 kW - 1 GW) and MFCs for low power operation (fusion power of $$<$$ 100 kW) will be used in combination in order to cover the target measurement requirements of ITER. The MFCs for high power operation will be installed in the vacuum vessel. However, since size of the MFCs for low power operation is large, those will be installed in the equatorial (EQ) port. Several kinds of neutron shield exist between the plasma and MFCs. Then, we estimate the effect of these shields by a neutron Monte Carlo calculation using MCNP code. Effect of the changes in the plasma positions is also investigated. It is found that correction based on the position of the plasma center for output of the MFCs is needed for the horizontal changes in the plasma position for the MFC for low power operation.

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