Nonlinear beam dynamics experiments at the SRRC

Kuo, Chun‐Yan; Chang, H. P.; Chen, J.; Hsu, K.T.; Hu, Kuo Hwa; Lin, K.K.; Liu, Y.C.; Tsai, Hung-Jen; Ueng, T.S.

doi:10.1109/pac.2001.987176

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

DOI: 10.1109/pac.2001.987176

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Nonlinear beam dynamics experiments at the SRRC

Chun‐Yan Kuo

H. P. Chang

J. Chen

et al.

Abstract: Nonlinear beam dynamics experiments were conducted at the Taiwan Light Source (TLS) of the Synchrotron Radiation Research Center (SRRC). We employed a turn-by-turn BPM system to obtain nonlinear dynamics of the excited bunched beam. Extracted nonlinear parameters are compared with the simulation results.

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“…It requires strong transverse focusing and defocusing quadrupoles and strong chromaticity correcting sextupoles to achieve a good performance. A series of studies on the nonlinear resonance [5] have been conducted recently to understand its effects. The TLS is a storage ring having a superperiodicity of 6.…”

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Experimental study on the 5th order nonlinear resonance at Taiwan Light Source

Ueng¹,

Chen²,

Hsu³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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The 5th order nonlinear resonance was studied at SRRC's electron storage ring, which has working tunes around ν x = 7.23 and ν y = 4.17. This resonance is interesting due to the possible systematic errors from its 6-fold symmetry lattice design. In order to understand the dynamics of resonance and effects of betatron decoherence and linear coupling, experiments have been performed using the 2-BPM turn-by-turn method and phase space maps to study its phenomena. The experimental results are presented. INTROCUCTIONNonlinear beam dynamics experiments have been performed at many accelerator facilities for various resonance phenomena at different resonance conditions [1,2,3,4]. The sextupoles, octupoles and higher order multipoles in the accelerator can produce the non-linear effects that perturb the beam orbit and give the phase space significantly different from that with linear lattice elements. When the betatron tune is near a resonance condition, Pν x + Qν y = O, where P, Q, O are integers, its Poincaré map shows deviation from a simple ellipse.The Taiwan Light Source (TLS) electron storage ring of SRRC is a 3rd generation synchrotron radiation source providing low emittance electron beam. It requires strong transverse focusing and defocusing quadrupoles and strong chromaticity correcting sextupoles to achieve a good performance. A series of studies on the nonlinear resonance [5] have been conducted recently to understand its effects. The TLS is a storage ring having a superperiodicity of 6. It operates routinely with transverse betatron tunes at around ν x = 7.23 and ν y = 4.17. At the one dimensional nonlinear resonance, mν x = O. The 5th order resonance with m = 5 and ν x = 7.2 gives O =36. It is just a multiple of the superperiodicity. In this experiment, the effects of sextupoles and the decapole in the dipole magnet on the 5th order systematic resonance is studied.

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confidence: 99%

Experimental study on the 5th order nonlinear resonance at Taiwan Light Source

Ueng¹,

Chen²,

Hsu³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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Experimental measurements of 2-dimensional nonlinear resonances

Ueng¹,

Chen²,

Hsu³

et al.

Proceedings of the 2003 Bipolar/BiCMOS Circuits and Technology Meeting (IEEE Cat. No.03CH37440)

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Nonlinear beam dynamics experiments at the SRRC

Cited by 2 publications

References 1 publication

Experimental study on the 5th order nonlinear resonance at Taiwan Light Source

Experimental study on the 5th order nonlinear resonance at Taiwan Light Source

Experimental measurements of 2-dimensional nonlinear resonances

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