Overcoming Intrinsic Spin Resonances with an rf Dipole

Bai, Mei; Ahrens, L.; Alessi, J.; Brown, K.; Bunce, G.; Cameron, P.; Chu, C. M.; Glenn, J.W.; Huang, H.; Kponou, A.; Krueger, K.; Lamble, W.; Luccio, A.; Makdisi, Y. I.; Lee, S. Y.; Okamura, M.; Ratner, L. G.; Reece, Kimberly S.; Roser, T.; Spinka, H. M.; Syphers, M.; Tsoupas, N.; Underwood, D. G.; Asselt, W. van; Williams, N.; Yokosawa, A.

doi:10.1103/physrevlett.80.4673

Cited by 59 publications

(26 citation statements)

References 11 publications

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“…Based on this formula techniques for preserving polarization levels when crossing a resonance include fast tune jumps (for crossing so-called imperfection resonances, caused by magnetic field errors and magnet misalignments) and excitation of a large oscillation using an "AC dipole" [118] (for strong intrinsic resonances, excited by the horizontal magnetic fields which provide the vertical focusing; inducing a full spin flip).However, the most effective method for crossing multiple resonances, e.g. during acceleration, is the use of Siberian snakes [119].…”

Section: Polarized Beamsmentioning

confidence: 99%

Collider Beam Physics

Zimmermann

2014

Rev. Accl. Sci. Tech.

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Section: Polarized Beamsmentioning

confidence: 99%

Collider Beam Physics

Zimmermann

2014

Rev. Accl. Sci. Tech.

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“…TrackInit can find them on a file, unit (14), and just ignores them. This may save substantial run time.…”

Section: Discarded Elementsmentioning

confidence: 99%

“…Radio frequency dipoles The formalism is due to Mei Bai [14]. An RF Dipole gives a RF kick to the beam and produces both an orbit bump and a spin rotation.…”

Section: Routine Rfdipolementioning

confidence: 99%

“…Contains generated population This file is automatically built and used if it is enabled In this case, it contains a population of npart particles randomly generated with the parameters prescribed in Pop each record contains x ,px ,y ,py ,cDt ,∆E/pc ,spino ffile (14) blue.sy Input lattice descriptor This file is created first by MAD and then by the pre-processor mad read ffile(17) DiscardedElements.dat Contains machine elements not to be used in order to decrease the size of the lattice file If enabled, the file is read by TrackInit each record contains the name of a discarded element…”

Section: Gui: Input Filesmentioning

confidence: 99%

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Spink Users Manual. Version v.2-21-beta

Luccio¹

2007

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“…Unlike CESR, an AC dipole was used in RHIC to adiabatically excite the beam at the vicinity of the eigen-tune instead. This technique has been used to measure the beta functions and phase advances in RHIC [4], and also in the AGS to overcome intrinsic spin resonances [3].…”

Section: Introductionmentioning

confidence: 99%

Measurement of linear coupling resonance in RHIC

Bai

Pilat

Satogata

et al.

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

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Linear coupling is one of the factors that determine beam lifetime in RHIC. The traditional method of measuring the minimum tune separation requires a tune scan and can't be done parasitically or during the acceleration ramp. A new technique of using ac dipoles to measure linear coupling resonance has been developed at RHIC. This method measures the degree of coupling by comparing the amplitude of the horizontal coherent excitation with the amplitude of the vertical coherent excitation if the beam is excited by the vertical AC dipole and vice versa. One advantage of this method is that it can be done without changing tunes from the normal machine working points. In principle, this method can also localize the coupling source by mapping out the coupling driving terms throughout the ring. This is very useful for local decoupling the interaction regions in RHIC. A beam experiment of measuring linear coupling has been performed in RHIC during its 2003 run, and the analysis of the experimental data is discussed in this paper.

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Overcoming Intrinsic Spin Resonances with an rf Dipole

Cited by 59 publications

References 11 publications

Collider Beam Physics

Collider Beam Physics

Spink Users Manual. Version v.2-21-beta

Measurement of linear coupling resonance in RHIC

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