| 摘要 |
<p>PURPOSE:To enable easy design and manufacture of a saddle-like dipole coil by limiting an object which a multipolar component of a magnetic field eliminates to six polar components. CONSTITUTION:A coil 1 alone which is provided to a side near a horizontal surface including a central axis of a duct 3 is extended by a straight line in a longitudinal direction of the duct 3 by a length l from a boundary 6 between a straight line part A and a rise part B. A spacer 4 is provided to a clearance between coils 1 and 2. Six polar components in the extension part 7 have a maximum value when theta2=30 deg. and theta1=0 deg.. Therefore, the extension part 7 is provided so that the angle theta2=30 deg. which is an angle made by a straight line connecting an upper side 7b and a center 3a, and the duct 3 as the angle theta1=0 deg. which is an angle made by a straight line connecting a lower side 7a of the extension part 7 and a center 3a of the duct 3. According to this constitution, it is possible to design and manufacture a saddle-like dipole coil readily and to reduce an integral value of six polar components to zero or to minimize it.</p> |
