Penning trap,linear programming,magnet design,nonlinear

作者:吴巍;何源;马力祯;黄文学;夏佳文;
关键词:Penning trap,linear programming,magnet design,nonlinear

optimization methods,pattern search
单位:Institute of Modern Physics,Ball Neodymium Magnets
http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php Chinese Academy of

Sciences;Graduate University of Chinese Academy of Sciences;
摘要:A Penning trap system called Lanzhou Penning Trap(LPT) is

now being developed for precise mass measurements at the

Institute of Modern Physics(IMP).One of the key components is a 7

T actively shielded superconducting magnet with a clear warm bore

of 156 mm.The required field homogeneity is 3 × 10-7 over two 1

cubic centimeter volumes lying 220 mm apart along the magnet

axis.We introduce a two-step method which combines linear

programming and a nonlinear optimization algorithm for designing

the multi-section superconducting magnet.This method is fast and

flexible for handling arbitrary shaped homogeneous volumes and

coils.With the help of this method an optimal design for the LPT

superconducting magnet has been obtained.