Abstract
We consider the capability of flexible spin-transparent polarization control and manipulation in conventional synchrotrons at integer spin resonances by means of spin navigators. The latter are designed as a couple of small solenoids separated by a constant beam bend. We formulate the requirements to the navigator design considering the criteria for stability of the spin motion in the presence of synchrotron energy oscillations. We propose the design of a novel spin-flipping system free of resonant beam depolarization based on such a spin navigator. We discuss the possibilities of testing spin-flipping systems at an integer spin resonance with protons in the Nuclotron ring at JINR in Dubna, Russia, and with deuterons in the RHIC rings at BNL in Upton, New York. The results are relevant to the existing and future facilities where the spin transparency mode can be applied for polarization control.
Highlights
Polarized beam experiments are an essential part of the scientific programs at the future colliders including the accelerator complex NICA (Nuclotron-based Ion Collider Facility) [1] in Russia and the Electron Ion Collider (EIC) [2] in the USA
Our study demonstrates the feasibility and proposes an experimental verification of a new spin navigator (SN)-based polarization control system for synchrotrons operated in the spin transparency (ST) mode
We analyzed the possibilities of applying such systems with protons in the Nuclotron ring and with deuterons in one of the RHIC rings
Summary
Polarized beam experiments are an essential part of the scientific programs at the future colliders including the accelerator complex NICA (Nuclotron-based Ion Collider Facility) [1] in Russia and the Electron Ion Collider (EIC) [2] in the USA. Spin degeneration is removed by insertion of a small solenoid [9] This avoids the resonance depolarization problem during acceleration and maintenance of the polarized hadron beams. The crucial step in forming the ST concept was replacement of a single solenoid with a more flexible device, a spin navigator, which would be able to control the spin tune but to manipulate the direction n⃗ of the stable polarization. This has naturally led to a scheme with two small solenoids separated by a fixed orbital bend [10]. We discuss the possibility of testing a spin navigator for deuterons in RHIC when use of helical snakes is not practical
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