Paper 
Title 
Page 
WEPC033 
Decoupling Problem of Weakly Linear Coupled Double Minibetay Lattice of TPS Storage Ring 
2076 

 H.P. Chang, C.C. Chiang, M.S. Chiu
NSRRC, Hsinchu, Taiwan



Three double minibetay (DMBy) lattice design of the TPS storage ring is in progress to enhance the photon sources at three of the six long straight sections. For the estimation of Touschek beam lifetime, the TRACY code is used to calculate the momentum acceptance of the linear coupled TPS 3DMBy lattice. The weak linear coupling was generated by adding some random skew quadrupoles at all quadrupole locations in order to create 1% coupling. Using the Teng’s symplectic rotation form in program may cause trouble in decoupling the oneturn coupled matrix. This report describes how we solve this decoupling problem and some useful references and comments are also presented.



WEPC035 
Double MiniBetay Lattice for TPS Storage Ring 
2082 

 M.S. Chiu, H.P. Chang, C.T. Chen, C.C. Chiang, C.C. Kuo, Y.C. Lee, H.J. Tsai, C.H. Yang
NSRRC, Hsinchu, Taiwan



Based on our previous design of double minibetay optics in one 12m straight section, NSRRC plan to implement the double minibetay lattice in three 12m straight sections in TPS storage ring. Those three locations chosen for double minibetay lattice still retain the symmetry of accelerator lattice. The two symmetric minima of the vertical beta function will be created in the center of three 12m straight sections, respectively. We strived to obtain a linear lattice such that there is no significant increase in the natural emittance. Efforts were devoted to optimize the nonlinear beam dynamics with various simulation tools. Preliminary results will be reported.


