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Dose Rate
Gamma Ray
poloidal field
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Neutronic analysis of the ITER poloidal polarimeter
Neutronic analysis of the ITER poloidal polarimeter,10.1016/j.fusengdes.2011.01.046,Fusion Engineering and Design,M. Ishikawa,Y. Kawano,R. Imazawa,S.
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Neutronic analysis of the ITER poloidal polarimeter
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M. Ishikawa
,
Y. Kawano
,
R. Imazawa
,
S. Sato
,
G. Vayakis
,
L. Bertalot
,
E. Yatsuka
,
T. Hatae
,
T. Kondoh
,
Y. Kusama
The nuclear heating rates of the optical mirrors of the poloidal polarimeter installed in the equatorial port plug of ITER are calculated. Since the system cannot have a sufficiently labyrinthine structure and the second mirrors are located closer to the plasma than the first mirrors due to limited space, the nuclear heating rate of the second mirrors is as high as that of the first mirrors. However, it is possible to reduce the nuclear heating rates more than 1 order if the blanket shield module provides a sufficient degree of neutron shielding. The effect of the neutron shield on the peripheral region of the upper port plug, in which the optical system of the poloidal polarimeter is installed, is also evaluated. The gamma-ray
dose rate
106s after shutdown of operations in the back flange region has been estimated to be ∼60μSv/h when the neutron shield is filled in the port plug, which is below the design threshold for the ITER maintenance phase. Further, the nuclear heating rate of the
Poloidal field
coil near the same upper port has been evaluated to be more than 2 orders lower than the allowable value of 1mW/cc.
Journal:
Fusion Engineering and Design - FUSION ENG DES
, vol. 86, no. 6, pp. 1286-1289, 2011
DOI:
10.1016/j.fusengdes.2011.01.046
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