论文部分内容阅读
In a storage ring,asymmetry of theβfunction with momentum deviation is the main reason for asymmetry of the dynamic aperture.This paper applies simulation method based on AT code in Matlab to investigate sensitivity of theβfunction beating and the tune shift to quadrupole field error with the presence of bending field error in the Shanghai Synchrotron Radiation Facility(SSRF)storage ring.Sextupole effect on the variation trend is analyzed.Dynamics of the lattice for working points close to and away from the second order structural resonance stop-band are compared.These results show that theβfunction beating with momentum deviation doesn’t lie in the influence of the second order structural resonance stop-bands completely,but it is relevant to lattice structure.
In a storage ring, asymmetry of the β reason with momentum deviation is the main reason for asymmetry of the dynamic aperture. This paper applies simulation method based on AT code in Matlab to investigate sensitivity of the βfunction beating and the tune shift to quadrupole field error with the presence of bending field error in the Shanghai Synchrotron Radiation Facility (SSRF) storage ring. Sextupole effect on the variation trend is analyzed. Dynamics of the lattice for working points close to and away from the second order structural resonance stop-band are compared. These results show that the βfunction beating with momentum deviation does not lie in the influence of the second order structural resonance stop-bands completely, but it is relevant to the lattice structure.