Linear Optics Compensation of the Superconducting Wiggler in HLS

Abstract

Hefei Light Source is a dedicated VUV light source. A superconducting wiggler magnet, whose peak magnetic field is 6 T, was installed on the storage ring to generate hard X-ray radiation. With the compensation of tune shift due to superconducting wiggler, beam was successfully stored, while the beam lifetime was degenerated much. In order to cure the beam lifetime, some simple hardware improvement was made and linear optics compensation scheme was intensively studied by two calculation methods. Calculation results showed that focusing perturbation from wiggler can’t be eliminated completely for HLS and a new scenario of compensation, whose purpose is to remove tune shifts and to suppress large beta-function distortions, was brought forward. Experimental result has demonstrated the effectiveness of this new compensation scheme and the beam lifetime was recovered to original level without wiggler.