| 摘要 |
PURPOSE:To compensate the magnetic field of an annular permanent magnet to form a uniform magnetic field, by a method wherein a pair of annular permanent magnets are provided so as to leave the interval therebetween toward the same direction and a circular magnetic field compensating member is provided to the space between said annular permanent magnets. CONSTITUTION:A magnetic field generating apparatus 15 is formed by providing a pair of annular permanent magnets 8, 9 so as to leave the space (a) therebetween in coaxial relation to each other while coaxially providing a cylindrical solenoid to the gap between the annular permanent magnets 8, 9. By this constitution, the formation of a uniform magnetic field is enabled by compensating the magnetic field of the annular permanent magnets and, because a power consumption amount can be remarkably reduced, running cost can be reduced, a cooling system become a small scale and apparatus cost is lowered. |
