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Chinese Physics C> 2017, Vol. 41> Issue(1) : 017002 DOI: 10.1088/1674-1137/41/1/017002

Compensation for booster leakage field in the Duke storage ring

  • 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

  • The High Intensity Gamma-ray Source (HIGS) at Duke University is an accelerator-driven Compton gamma-ray source, providing high flux gamma-ray beam from 1 MeV to 100 MeV for photo-nuclear physics research. The HIGS facility operates three accelerators, a linac pre-injector (0.16 GeV), a booster injector (0.16-1.2 GeV), and an electron storage ring (0.24-1.2 GeV). Because of the proximity of the booster injector to the storage ring, the magnetic field of the booster dipoles close to the ring can significantly alter the closed orbit in the storage ring being operated in the low energy region. This type of orbit distortion can be a problem for certain precision experiments which demand a high degree of energy consistency of the gamma-ray beam. This energy consistency can be achieved by maintaining consistent aiming of the gamma-ray beam, and therefore a steady electron beam orbit and angle at the Compton collision point. To overcome the booster leakage field problem, we have developed an orbit compensation scheme. This scheme is developed using two fast orbit correctors and implemented as a feedforward which is operated transparently together with the slow orbit feedback system. In this paper, we will describe the development of this leakage field compensation scheme, and report the measurement results, which demonstrate the effectiveness of the scheme.
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  • References

    [1] S.F. Mikhailov et al, Commissioning of the Booster Injector Synchrotron for the HIGS Facility at Duke University, in Proceedings of the PAC07 (2007)
    [2] S.F. Mikhailov et al, Multi-bunch Injection Scheme for the Duke Booster Synchrotron for Top-off Injection, in Proceedings of the PAC09 (2009)
    [3] Y.K. Wu et al, Phys. Rev. Lett., 96:224801(2006)
    [4] V.N. Litvinenko and J.M.J. Madey, Nucl. Instrum. Methods in Phys. Res. Sect. A, 375:580-583(1996)
    [5] V.N. Litvinenko et al, Phys. Rev. Lett., 78:4569(1997)
    [6] W. Joho et al, Nucl. Instrum. Methods A, 562(1):1-11(2006)
    [7] H.J Tsai et al, Hardware Improvements and Beam Commissioning of the Booster Ring in Taiwan Photon Source, in Proceeding of IPAC2015 (Richmond, USA, 2015)
    [8] R. Keller et al, Orbit Stability of the ALS Storage Ring, in Proceeding of PAC1997 (1997), Vol. 1, p 784-786
    [9] M. Eriksson et al, J. Synchrotron Radiat., 21(5):837-842(2014)
    [10] Y.K. Wu, et al, Performance and Capabilities of Upgraded High Intensity Gamma-ray Source at Duke University, in Proceedings of the PAC09 (2009)
    [11] Y.K. Wu et al, BPM and Orbit Correction Systems at the Duke Storage Ring, in Proceedings of the PAC03 (2003), Vol. 4, p 2479-2481
    [12] M. Bge et al, Fast Closed Orbit Control in the SLS Storage Ring, in Proceedings of the PAC1999, Vol. 2, p 1129-1131
    [13] S.Y Lee, Accelerator Physics (World Scientific, 2004)

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Wei Li, Hao Hao, Stepan F. Mikhailov, Victor Popov, Wei-Min Li and Ying. K. Wu. Compensation for booster leakage field in the Duke storage ring[J]. Chinese Physics C, 2017, 41(1): 017002. doi: 10.1088/1674-1137/41/1/017002
Wei Li, Hao Hao, Stepan F. Mikhailov, Victor Popov, Wei-Min Li and Ying. K. Wu. Compensation for booster leakage field in the Duke storage ring[J]. Chinese Physics C, 2017, 41(1): 017002.  doi: 10.1088/1674-1137/41/1/017002 shu
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Received: 2016-05-23
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    Supported by National Natural Science Foundation of China (11175180, 11475167) and US DOE (DE-FG02-97ER41033)

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Compensation for booster leakage field in the Duke storage ring

    Corresponding author: Wei Li,
    Corresponding author: Hao Hao,
  • 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
  • Received Date: 2016-05-23
  • Available Online: 2017-01-05
Fund Project:  Supported by National Natural Science Foundation of China (11175180, 11475167) and US DOE (DE-FG02-97ER41033)

Abstract: The High Intensity Gamma-ray Source (HIGS) at Duke University is an accelerator-driven Compton gamma-ray source, providing high flux gamma-ray beam from 1 MeV to 100 MeV for photo-nuclear physics research. The HIGS facility operates three accelerators, a linac pre-injector (0.16 GeV), a booster injector (0.16-1.2 GeV), and an electron storage ring (0.24-1.2 GeV). Because of the proximity of the booster injector to the storage ring, the magnetic field of the booster dipoles close to the ring can significantly alter the closed orbit in the storage ring being operated in the low energy region. This type of orbit distortion can be a problem for certain precision experiments which demand a high degree of energy consistency of the gamma-ray beam. This energy consistency can be achieved by maintaining consistent aiming of the gamma-ray beam, and therefore a steady electron beam orbit and angle at the Compton collision point. To overcome the booster leakage field problem, we have developed an orbit compensation scheme. This scheme is developed using two fast orbit correctors and implemented as a feedforward which is operated transparently together with the slow orbit feedback system. In this paper, we will describe the development of this leakage field compensation scheme, and report the measurement results, which demonstrate the effectiveness of the scheme.

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