Local bump of beam closed orbit in Hefei Light Source

The local bump of beam closed orbit is designed for some specific beamline in the Hefei Light Source. The design demands local orbit adjustment of 1~2 mm, horizontal and vertical closed orbit distortion outside the bump orbit less than 50 μm and 30 μm. In this paper, the local bump principle, hardware components, software design and the results are described. The local bump system adopts the orbit setting algorithm, and consists of the beam orbit measure system, the corrector magnet system and the control system. The main operation results of the system show that maximum values of horizontal and vertical local orbit adjustment are 2 mm and 1.5 mm respectively, horizontal and vertical closed orbit distortion outside bump orbit are less than 45.14 μm and 27.62 μm respectively.