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Chinese Physics C> 2017, Vol. 41> Issue(8) : 087002 DOI: 10.1088/1674-1137/41/8/087002

Analysis and correction of linear optics errors, and operational improvements in the Indus-2 storage ring

  • 1.

     Accelerator Physics Section, Raja Ramanna Centre for Advanced Technology, Indore, 452013, India

  • 2.

     Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400 094, India

  • 3.

      Accelerator Physics Section, Raja Ramanna Centre for Advanced Technology, Indore, 452013, India

  • Estimation and correction of the optics errors in an operational storage ring is always vital to achieve the design performance. To achieve this task, the most suitable and widely used technique, called linear optics from closed orbit (LOCO) is used in almost all storage ring based synchrotron radiation sources. In this technique, based on the response matrix fit, errors in the quadrupole strengths, beam position monitor (BPM) gains, orbit corrector calibration factors etc. can be obtained. For correction of the optics, suitable changes in the quadrupole strengths can be applied through the driving currents of the quadrupole power supplies to achieve the desired optics. The LOCO code has been used at the Indus-2 storage ring for the first time. The estimation of linear beam optics errors and their correction to minimize the distortion of linear beam dynamical parameters by using the installed number of quadrupole power supplies is discussed. After the optics correction, the performance of the storage ring is improved in terms of better beam injection/accumulation, reduced beam loss during energy ramping, and improvement in beam lifetime. It is also useful in controlling the leakage in the orbit bump required for machine studies or for commissioning of new beamlines.
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  • References

    [1] D. Robin et al, Phys. Rev. ST Accel. Beams, 6:044001 (1999)
    [2] M. G. Minty and F. Zimmermann, Measurement and Control of Charged Particle Beams, Springer, Berlin, ISBN 978-3-540-44187-8 (2003)
    [3] A. D. Ghodke, Riyasat Husain, Pradeep Kumar et al, Rev. Sci. Instrum., 83:103303 (2012)
    [4] X. Huang, Beam Diagnosis and Lattice Modeling of the Fermilab Booster, Ph.D. Thesis (Indiana University, USA 2005)
    [5] J. Safranek, Instr. Meth. Phys. A, 388:27 (1997)
    [6] L. Yang, Storage Lattice Modelling and its Applications, Ph.D. Thesis (Indiana University, USA 2007)
    [7] M. Aiba, M. Boge, J. Chrin et al, Phys. Rev. ST Accel. Beams, 16:012802 (2013)
    [8] R. Bartolini, I. Martin, J. Rowland et al, Phys. Rev. ST Accel. Beams, 11:104002 (2008)
    [9] R. Bartolini, I. P. S. Martin, G. Rehm et al, Phys. Rev. ST Accel. Beams, 14:054003 (2011)
    [10] V. Sajaev, V. Lebedev, V. Nagaslaev et al, Determination of precise model of a storage ring using response matrix fit:Application to Advanced Photon Source and Tevatron, in Proceedings of the 2006 Russian Particle Accelerator Conference (RuPAC), WEJO03 (2006).
    [11] Laurent S. Nadolski, Use of LOCO at Synchrotron SOLEIL, in Proceedings of the 2008 European Particle Accelerator Conference (EPAC), Genoa, Italy, THPC064 3131 (2008)
    [12] G. M. Liu and S.Q. Tian, Linear Optics Calibrations for the SSRF Storage Ring based on COD, in Proceedings of the 2009 Particle Accelerator Conference (PAC), Vancouver, BC, Canada, FR5PFP028 4366 (2009)
    [13] G. Benedetti, D. Einfeld, Z. Marti et al, LOCO in the ALBA Storage Ring, in Proceedings of the 2011 International Particle Accelerator Conference (IPAC), San Sebastin, Spain, WEPC024, 2055 (2011)
    [14] Xi Yang, X. Huang, and J. Safranek, LOCO Application to NSLS2 SR Dispersion and Beta Beating Correction, in Proceedings of the 2015 International Particle Accelerator Conference (IPAC), TUPHA012, 989 (2015)
    [15] Yves R. Roblin, Calibrating Transport Lines using LOCO Techniques, in Proceedings of the 2011 International Particle Accelerator Conference (IPAC), San Sebastin, Spain, WEPC048, 2118 (2011)
    [16] D. H. Ji, M. Bai, C. Weidemann et al, First Experience of applying LOCO for Optics at COSY, in Proceedings of the 2016 International Particle Accelerator Conference (IPAC), Busan, Korea, TUPMR026, 1294 (2016)
    [17] M. McAteer, S. Kopp, A. Petrenko et al, Model Calibration and Optics Correction Using Orbit Response Matrix in the Fermilab Booster, in Proceedings of the 2012 International Particle Accelerator Conference (IPAC), New Orleans, Louisiana, USA, TUPPC040, 1251 (2012)
    [18] G. Singh, G. K. Sahoo, D. Angel et al, Synchrotron Radiation Source Indus-2, Indian Journal of Applied Physics, 35(efeq1):183 (1997)
    [19] A. D. Ghodke, Riyasat Husain, Gurnam Singh et al, ICFA Beam Dynamics Newsletter, 41:77 (2006)
    [20] A. Terebilo, Accelerator Toolbox for MATLAB, SLAC-PUB-8732 (2001)
    [21] Saroj Kumar Jena, Riyasat Husain, M. L. Gandhi et al, Rev. Sci. Instrum., 86(9):093303 (2015)
    [22] Riyasat Husain and A. D. Ghodke, Orbit Response Matrix Analysis in Indus-2 at 2.5 GeV, in Proceedings of Indian Particle Accelerator Conference (InPAC), VECC, Kolkata (2013)
    [23] L.S. Nadolski and J. Laskar, Phys. Rev. ST Accel. Beams, 6:114801 (2013)
    [24] M. Yoon and T. Lee, Rev. Sci. Instrum., 68(7):2651 (1997)

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Riyasat Husain and A. D. Ghodke. Analysis and correction of linear optics errors, and operational improvements in the Indus-2 storage ring[J]. Chinese Physics C, 2017, 41(8): 087002. doi: 10.1088/1674-1137/41/8/087002
Riyasat Husain and A. D. Ghodke. Analysis and correction of linear optics errors, and operational improvements in the Indus-2 storage ring[J]. Chinese Physics C, 2017, 41(8): 087002.  doi: 10.1088/1674-1137/41/8/087002 shu
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Received: 2016-12-15
Revised: 2017-04-07
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Analysis and correction of linear optics errors, and operational improvements in the Indus-2 storage ring

    Corresponding author: Riyasat Husain, riyasat@rrcat.gov.in
  • 1. Accelerator Physics Section, Raja Ramanna Centre for Advanced Technology, Indore, 452013, India
  • 2. Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400 094, India
  • 3.  Accelerator Physics Section, Raja Ramanna Centre for Advanced Technology, Indore, 452013, India
  • Received Date: 2016-12-15
  • Accepted Date: 2017-04-07
  • Available Online: 2017-08-05

Abstract: Estimation and correction of the optics errors in an operational storage ring is always vital to achieve the design performance. To achieve this task, the most suitable and widely used technique, called linear optics from closed orbit (LOCO) is used in almost all storage ring based synchrotron radiation sources. In this technique, based on the response matrix fit, errors in the quadrupole strengths, beam position monitor (BPM) gains, orbit corrector calibration factors etc. can be obtained. For correction of the optics, suitable changes in the quadrupole strengths can be applied through the driving currents of the quadrupole power supplies to achieve the desired optics. The LOCO code has been used at the Indus-2 storage ring for the first time. The estimation of linear beam optics errors and their correction to minimize the distortion of linear beam dynamical parameters by using the installed number of quadrupole power supplies is discussed. After the optics correction, the performance of the storage ring is improved in terms of better beam injection/accumulation, reduced beam loss during energy ramping, and improvement in beam lifetime. It is also useful in controlling the leakage in the orbit bump required for machine studies or for commissioning of new beamlines.

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