Orbit correction in electron storage ring for Central Japan Synchrotron Radiation Research Facility project

Simulation of COD (COD: Closed Orbit Distortion) in an electron storage ring for Central Japan Synchrotron Radiation Research Facility Project, planned to be constructed in suburb of Nagoya was performed. Three sources of COD were considered: (a) Field error of bending magnets, (b) Alignment error of bending magnets, (c) Alignment error of quadrupole magnets. As a remarkable feature, this ring has four 5T superconducting magnets among 12 bending magnets, to generate hard X-rays. It is prospected that magnetic error of the superconducting magnets would be larger than that of normal conducting bending magnets. We have assumed 1% field errors on the super bends. It was found that the most influenced factor on the horizontal COD and vertical one is field error of super bend magnets and alignment error of bending magnets, respectively. The strengths of correcting magnets are required to be 0.6mrad on horizontal and 0.2mrad on vertical, assuming that the COD by superconducting magnets are corrected by adjusting their own excitation currents individually. (author)