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《中国物理C》（英文）编辑部
2024年10月30日
Chinese Physics C> 2003, Vol. 27> Issue(8) : 722-725 

Correction of Closed Orbit and Dispersion Function in the Electron Storage Ring

  •  National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China

  • In electron storage ring, the distortion of closed orbit and dispersion, due to inaccuracies of magnets manufacture and misalignment, will cause a series of negative effects, such as tune-shift, distortion of optic function, decrease of dynamic aperture, and decrease of luminance et al. Previous work mainly concentrated on the correction of closed orbit, recently a method to correct orbit and dispersion simultaneously is developed to improve the performance of storage ring, and adopted by some accelerator labs. At the same time, the beam-based-alignment is adopted to let beam pass through the center of magnets instead of vacuum chamber, so the base for correction is also the center of magnets. This paper introduces the feasibility study of realizing correction of closed orbit and dispersion, by using singular value decomposition of response matrix, at Hefei Light Source storage ring. The simulation study shows that, the rms. value of closed orbit distortion is less than 0.1 mm, and dispersions at vertical plane and dispersion-free region at horizontal plane basically disappear after correction.
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  • References

    [1] LIU Sheng–Li et al. HEP NP, 1998, 22(2) :176–179(in Chinese)(刘胜利等 高能物理与核物理,1998,22(2) :176–179) 2 SUN Bao–Geng et al. HEP NP, 2002, 26(4) :416(in Chinese)(孙葆根等.高能物理与核物理,2002,26(4) :416–422)3 Courant E, Snyder H. Annals of Physics, 2000 281 : 360–4084 Wiedemann H. Particle Accelerator Physics Ⅰ Ⅱ, 2nd Edition, Berlin: Springer, 19985 Friedmann A et al. Nuel. Instr. and Meth. in Phys. Res., 1994, A344 : 269–277 6 WANG Jun–Hua et al. HEP NP, 2002, 26(6) :632(in Chinese)(王筠华等.高能物理与核物理,2002,26(6) :632–638)

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LI Yong-Jun, WANG Lin, FENG Guang-Yao, SUN Bao-Gen, XU Hong-Liang, LI Wei-Min and LIU Zu-Ping. Correction of Closed Orbit and Dispersion Function in the Electron Storage Ring[J]. Chinese Physics C, 2003, 27(8): 722-725.
LI Yong-Jun, WANG Lin, FENG Guang-Yao, SUN Bao-Gen, XU Hong-Liang, LI Wei-Min and LIU Zu-Ping. Correction of Closed Orbit and Dispersion Function in the Electron Storage Ring[J]. Chinese Physics C, 2003, 27(8): 722-725. shu
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Received: 2002-10-28
Revised: 1900-01-01
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Correction of Closed Orbit and Dispersion Function in the Electron Storage Ring

    Corresponding author: LI Yong-Jun,
  • National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
  • Received Date: 2002-10-28
  • Accepted Date: 1900-01-01
  • Available Online: 2003-08-05

Abstract: In electron storage ring, the distortion of closed orbit and dispersion, due to inaccuracies of magnets manufacture and misalignment, will cause a series of negative effects, such as tune-shift, distortion of optic function, decrease of dynamic aperture, and decrease of luminance et al. Previous work mainly concentrated on the correction of closed orbit, recently a method to correct orbit and dispersion simultaneously is developed to improve the performance of storage ring, and adopted by some accelerator labs. At the same time, the beam-based-alignment is adopted to let beam pass through the center of magnets instead of vacuum chamber, so the base for correction is also the center of magnets. This paper introduces the feasibility study of realizing correction of closed orbit and dispersion, by using singular value decomposition of response matrix, at Hefei Light Source storage ring. The simulation study shows that, the rms. value of closed orbit distortion is less than 0.1 mm, and dispersions at vertical plane and dispersion-free region at horizontal plane basically disappear after correction.

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