Author/Authors :
Yin، نويسنده , , Z.S. and Wu، نويسنده , , Y.Z. and Zhang، نويسنده , , J.F. and Chen، نويسنده , , W. and Li، نويسنده , , Y.J. and Li، نويسنده , , L. and Hou، نويسنده , , R. and Yin، نويسنده , , B.G. and Sun، نويسنده , , X.J. and Ren، نويسنده , , F.L. and Wang، نويسنده , , F.A. and Chen، نويسنده , , F.S. and Yu، نويسنده , , C.H. and Chen، نويسنده , , C.، نويسنده ,
Abstract :
With the Beijing Electron Positron Collider upgrade project (BEPC-II), two dual-aperture septum-style quadrupole magnets are used in the interaction region for the final focusing of the electron and positron beams. The BEPC-II lattice design calls for the same high quality integral quadrupole field and large good field region in both apertures for each magnet. Two-dimensional contour optimization and pole-end chamfer iteration are used to minimize the systematic harmonic errors. Unexpected non-systematic errors induced by the unsymmetrical structure and the manufacturing errors are compensated with the pole-end shimming. Magnet measurements with rotating coils are performed to guide and confirm the magnet design. This paper discusses the design consideration, optimizing procedure and measurement results of these dual-aperture magnets.
