Ion polarization control in MEIC rings using small magnetic fields integrals

Morozov, Vasiliy; Derbenev, Slava; Lin, Fanglei; Zhang, Yuhong; Kondratenko, Anatoly; Kondratenko, M. A.; Filatov, Yurii

doi:10.22323/1.182.0026

Cited by 8 publications

(10 citation statements)

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“…The only requirement is that the spin rotation due to the SN should be much greater than that due to imperfections, i.e., the zero integer spin resonance strength. Such a navigator has practically no effect on the orbital beam dynamics [83,84].…”

Section: General Ideamentioning

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: General Ideamentioning

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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“…SN schemes with no distortion of the closed orbit are based on the use of solenoids [15][16][17][18][19]. The lattice enhancement coefficient for the fields of the navigator solenoids is a unit, since the closed orbit after their insertion still coincides with the design one.…”

Section: Sn Not Perturbing the Closed Orbitmentioning

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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“…1. An intense high-brightness flow of He + ions is generated in the arc-discharge source (1) and formed into an ion beam by a multi-grid multi-slit flat extraction system of 4 cm in diameter. This intense spacecharge-compensated beam is focused by a magnetic lens (2) into a sodium jet charge-exchange target (3).…”

Section: Potential Options For Production Of Polarized 3 He -Ionsmentioning

confidence: 99%

“…The beam profiles are controlled by profile monitors (6) and (7). Under the optimal conditions at the energy of 12 keV, up to 1 3 He ions [5,7]. A pulsed gas valve [11] can provide low gas consumption, which is important because 3 He gas is very expensive.…”

Section: Potential Options For Production Of Polarized 3 He -Ionsmentioning

confidence: 99%

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Polarized 3He− ion source with hyperfine state selection

Dudnikov

Morozov

Dudnikov

2015

AIP Conference Proceedings

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Abstract. High beam polarization is essential to the scientific productivity of a collider. Polarized 3 He ions are an essential part of the nuclear physics programs at existing and future ion-ion and electron-ion colliders such as BNL's RHIC and eRHIC and JLab's ELIC. Ion sources with performance exceeding that achieved today are a key requirement for the development of these next generation high-luminosity high-polarization colliders. The development of high-intensity high-brightness arc-discharge ion sources at the Budker Institute of Nuclear Physics (BINP) has opened up an opportunity for realization of a new type of a polarized 3 He ion source. This report discusses a polarized 3 He ion source based on the large difference of extra-electron autodetachment lifetimes of the different 3 He ion hyperfine states. The highest momentum state of 5/2 has the largest lifetime of ~3 3 He ion beam composed of only the |5/2, 5/2> hyperfine states and then quenching one of the states by an RF resonant field, 3 He beam polarization of 90% can be achieved. Such a method of polarized 3 He production has been considered before; however, due to low intensities of the He + ion sources existing at that time, it was not possible to produce any interesting intensity of polarized 3 He ions. The high-brightness arc-discharge ion source developed at BINP can produce a high-brightness 3 He + beam with an intensity of up to 2 A allowing for selection of up to ~1-4 mA of 3 He ions with ~90% polarization. The high gas efficiency of an arc-discharge source is important due to the high cost of 3 He gas. Some features of such a PIS as well as prototype designs are considered. An integrated 3 He ion source design providing high beam polarization could be prepared using existing BNL equipment with incorporation of new designs of the 1) arc discharge plasma generator, 2) extraction system, 3) charge exchange jet, and 4) magnetic separation system.

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Ion polarization control in MEIC rings using small magnetic fields integrals

Cited by 8 publications

References 1 publication

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

Polarized 3He− ion source with hyperfine state selection

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