| 摘要 |
PURPOSE:To realize easy seaming operation by getting the first optimum condition under which the uniformity of a magnetic field which is produced only by a uniform magnetic field coil in a uniform magnetic field space and by getting the second optimum condition under which the uniform magnetic field coil can eliminate the developed turbulence in the magnetic field based on the first optimum condition. CONSTITUTION:Intensities of magnetic fields on a total of four points which are an origin, a position in the axial direction of ringed coils 11, 21 which deviate by a minimum distance from the origin at a fixed interval, and positions in the axial and radial directions of ringed coils 21, 22, is gotten. Three coefficients of which degrees are 2, 4, and 6 can be obtained by using a difference formula from the four magnetic field strengths. These three coefficients are repeatedly calculated by varying the position of each ringed coil. An item of a uniform magnetic field coil 1 where three coefficient values are minimized so as to be regarded as zero is the first optimum condition. Then three dimensional magnetic field is calculated under the condition and the obtained coefficients K2, K4, K6 of which degrees are 2, 4, 6 are the coefficients against the distribution of magnetic field turbulence by selfshield. Calculation is repeatedly carried out to get coefficient values of -K2, -K4, -K6 instead of the coefficients K2, K4, K6 to obtain the second optimum condition. |
