Field Correction of a Quadrupole Magnet and a Skew-Quadrupole Magnet By Using Iron Plates Attached to the End Shaping

Autor:	Tadatoshi Yamada, Nakamura Shirou, Tetsuya Matsuda, Masatami Iwamoto, Syunji Yamamoto
Rok vydání:	1997
Předmět:	Physics Pole piece Electropermanent magnet Field (physics) Industrial and Manufacturing Engineering Magnetic field Nuclear magnetic resonance Dipole magnet Magnet Physics::Accelerator Physics Electrical and Electronic Engineering Atomic physics Quadrupole magnet Multipole expansion
Zdroj:	IEEJ Transactions on Industry Applications. 117:696-703
ISSN:	1348-8163 0913-6339
DOI:	10.1541/ieejias.117.696
Popis:	It is well known that magnetic field linearities of the conventional quadrupole magnet and the skew-quadrupole magnet are improved by the end shaping of the pole. We found that small iron plates which were attached to the end shaping changed field distributions and radial and azimuthal multipole error components were cancelled by selecting the optimum mass of iron plates. The optimum mass was determined from a few field measurements easily. In addition, we found that the transverse distribution of the field gradient of the quadrupole magnet changed concavely according to increasing iron plates and the that distribution of the skew-quadrupole magnet changed convexly in reverse. This difference of the change of the field is due to the difference of the sign of the dodecapole error component between the quadrupole magnet and the skew-quadrupole magnet
Databáze:	OpenAIRE
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