4-twist helix snake to maintain polarization in multi-GeV proton rings

Antoulinakis, Foivos; Chen, Y.; Dutton, Andrea; Fuente, Erick Rossi De La; Haupert, Spencer R.; Ljungman, Emily A.; Myers, P. D.; Thompson, J. K.; Tai, Andrew W.; Aidala, C.; Courant, E. D.; Krisch, A. D.; Леонова, М. А.; Lorenzon, W.; Raymond, R. S.; Sivers, Dennis; Wong, V. K.; Yang, T. F.; Derbenev, Yaroslav; Morozov, Vasiliy; Kondratenko, A. M.

doi:10.1103/physrevaccelbeams.20.091003

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…Two corrector dipoles with vertical fields of opposite directions are placed around the helical dipole for compensation of the radial orbit shift. A design of a helical snake with 4 field turns has been proposed for acceleration of polarized protons from 9 to 120 GeV in FermiLab's Main Injector [81].…”

Section: Spin Echo Techniques For Spin Stabilization In Synchrotrons 61 Siberian Snakesmentioning

confidence: 99%

Siberian Snakes, Figure-8 and Spin Transparency Techniques for High Precision Experiments with Polarized Hadron Beams in Colliders

et al. 2021

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We present a review of the possibilities to conduct experiments of high efficiency in the nuclear and high energy physics with spin-polarized beams in a collider complex, configuration of which includes Siberian snakes or figure-8 collider ring. Special attention is given to the recently elicited advantageous possibility to conduct high precision experiments in a regime of the spin transparency (ST) when the design global spin tune is close to zero. In this regime, the polarization control is realized by use of spin navigators (SN), which are compact special insertions of magnets dedicated to a high flexibility spin manipulation including frequent spin flips.

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Section: Spin Echo Techniques For Spin Stabilization In Synchrotrons 61 Siberian Snakesmentioning

confidence: 99%

Siberian Snakes, Figure-8 and Spin Transparency Techniques for High Precision Experiments with Polarized Hadron Beams in Colliders

et al. 2021

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“…This allows for replacement of solenoids with helical magnets in SN designs for high energies. Let us give an example of a scheme analogous to an SN with two solenoids where the solenoids are replaced by helical magnets [20]. The closed orbit offset in the region with a helical magnet is compensated by a pair of dipoles with opposite field directions placed on both sides of the helical magnet.…”

Section: Sn With Two Helical Magnetsmentioning

confidence: 99%

Polarization control in spin-transparent hadron colliders by weak-field navigators involving lattice enhancement effect

Filatov

Kondratenko

et al. 2021

Eur. Phys. J. C

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Hadron polarization control schemes for Spin Transparent (ST) synchrotrons are analyzed. The spin dynamics and beam polarization in such synchrotrons are controlled by spin navigators (SN) which are special small insertions of weak magnetic fields. An SN stabilizes the beam polarization and allows for setting any desirable spin orientation at an interaction point in the operational regime, including a frequent spin flip. We present a general approach to design of SNs. We distinguish different types of SNs, namely, those not causing closed orbit perturbation as well as those producing local and global orbit distortions. In the second case, the concept of the spin response function in an ST synchrotron is applied and expanded to reveal the effect of the SN strength enhancement by magnetic lattice of the synchrotron. We provide conceptual schemes for SN designs using longitudinal and transverse magnetic fields allowing for polarization control at low as well as high energies. We also develop the ST concept for ultra-high energies. This development may enable and stimulate interest in polarized beam experiments in possible polarized collider projects such as Large Hadron Collider (LHC), Future Circular Collider (FCC) and Super Proton Proton Collider (SPPC).

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Polarization issues in circular electron–positron super-colliders

Никитин

2020

Int. J. Mod. Phys. A

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We study a possibility of obtaining transversely polarized electron/positron beams in the CEPC collider. Also, original results are presented for another project, the FCCee collider, which allows us to identify some features and differences of these similar machines. Important is the comparison of the data obtained with the expected and measured polarizations at LEP. In estimation of the depolarizing effect of field errors, in addition to the usual nonresonant spin diffusion, an attempt was made to take into account the resonant diffusion, which is due to a large spin tune spread. We consider a possibility to obtain polarization by accelerating polarized particles in the CEPC booster and then injecting them into the main ring. This option can be crucial for obtaining longitudinal polarization. We propose a scheme in which long-term preservation of such polarization is possible.

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4-twist helix snake to maintain polarization in multi-GeV proton rings

Cited by 3 publications

References 18 publications

Siberian Snakes, Figure-8 and Spin Transparency Techniques for High Precision Experiments with Polarized Hadron Beams in Colliders

Siberian Snakes, Figure-8 and Spin Transparency Techniques for High Precision Experiments with Polarized Hadron Beams in Colliders

Polarization control in spin-transparent hadron colliders by weak-field navigators involving lattice enhancement effect

Polarization issues in circular electron–positron super-colliders

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