The effect of the stray magnetic field to the gyrotron collector is analyzed. The analysis includes the stray magnetic field from the adjacent gyrotrons and tokamak. In order to avoid the effect of the stray magnetic field from the adjacent gyrotrons, the minimum distance between the gyrotrons is estimated as 4m. The effect of the stray magnetic field from tokamak on gyrotron collector (～100m from tokamak) is negligible compared to the adjacent gyrotron with 4m distance.
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