Study of magnetic hysteresis effects in a storage ring using precision tune measurement

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Wei Li, Hao Hao, Stepan F. Mikhailov, Wei Xu, Jing-Yi Li, Wei-Min Li and Ying. K. Wu. Study of magnetic hysteresis effects in a storage ring using precision tune measurement[J]. Chinese Physics C, 2016, 40(12): 127002. doi: 10.1088/1674-1137/40/12/127002
Wei Li, Hao Hao, Stepan F. Mikhailov, Wei Xu, Jing-Yi Li, Wei-Min Li and Ying. K. Wu. Study of magnetic hysteresis effects in a storage ring using precision tune measurement[J]. Chinese Physics C, 2016, 40(12): 127002.  doi: 10.1088/1674-1137/40/12/127002 shu
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Received: 2016-04-18
Revised: 2016-07-02
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    Supported by National Natural Science Foundation of China (11175180, 11475167) and US DOE (DE-FG02-97ER41033)

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Study of magnetic hysteresis effects in a storage ring using precision tune measurement

    Corresponding author: Wei Li, wei.li3@duke.edu
    Corresponding author: Wei-Min Li, wei.li3@duke.edu
  • 1. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
  • 2. Triangle University Nuclear Laboratory/Physics Department, Duke University, Durham 27705, USA
  • 3.  Triangle University Nuclear Laboratory/Physics Department, Duke University, Durham 27705, USA
  • 4.  National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
Fund Project:  Supported by National Natural Science Foundation of China (11175180, 11475167) and US DOE (DE-FG02-97ER41033)

Abstract: With the advances in accelerator science and technology in recent decades, the accelerator community has focused on the development of next-generation light sources, for example diffraction-limited storage rings (DLSRs), which require precision control of the electron beam energy and betatron tunes. This work is aimed at understanding magnet hysteresis effects on the electron beam energy and lattice focusing in circular accelerators, and developing new methods to gain better control of these effects. In this paper, we will report our recent experimental study of the magnetic hysteresis effects and their impacts on the Duke storage ring lattice using the transverse feedback based precision tune measurement system. The major magnet hysteresis effects associated with magnet normalization and lattice ramping are carefully studied to determine an effective procedure for lattice preparation while maintaining a high degree of reproducibility of lattice focusing. The local hysteresis effects are also studied by measuring the betatron tune shifts which result from adjusting the setting of a quadrupole. A new technique has been developed to precisely recover the focusing strength of the quadrupole by returning it to a proper setting to overcome the local hysteresis effect.

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