Measurement of the Spin Tune Using the Coherent Spin Motion of Polarized Protons in a Storage Ring

Huang, H.; Kewisch, J.; Liu, C.; Marušić, A.; Meng, W.; Méot, F.; Oddo, P.; Ptitsyn, V.; Ranjbar, Vahid; Roser, T.; Schmidke, W. B.

doi:10.1103/physrevlett.122.204803

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…We have investigated the photon emission during this process. Now, we focus on the polarization of the photons, since polarized γ-ray beams have important applications in highenergy physics [58][59][60], nuclear physics [61][62][63] and laboratory astrophysics [64]. For example, high-energy polarized γ-ray beams can provide new tools for studying the radiation reaction force effects of strong-field QED [65]; highflux polarized γ-rays can increase the opportunity of verifying Breit-Wheeler processes by diagnosing the photon polarization information.…”

Section: Discussionmentioning

confidence: 99%

Generation of isolated and polarized γ-ray pulse by few-cycle laser irradiating a nanofoil

Zhang¹,

Liu²,

Tang³

et al. 2022

Plasma Phys. Control. Fusion

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An isolated ultra-short γ-ray pulse is a unique tool for measuring ultrafast-physics process, such as imaging of intra-nuclear dynamics and inner-shell electron dynamics. Here, we propose an all-optical efficient scheme for generating isolated ultra-short γ-ray pulse from a laser-driven nanofoil. When a few-cycle circularly polarized laser pulse with an intensity of 10 22 W/cm 2 irradiates a nanofoil, the electrons in the nanofoil are pushed forward collectively, forming a single relativistic electron sheet (RES) with the charge of nC. The electrons are substantially accelerated to high energies by the super-ponderomotive force of the laser. Then a counter-propagating laser pulse with a peak intensity of 10 21 W/cm 2 collides with the RES, resulting in the generation of an isolated sub-femtosecond γ-ray pulse via nonlinear Compton scattering. The effects of laser polarization on the polarization degree of γ-rays is investigated by using a proof-of-principle calculation. It is shown that a highly-polarized isolated γ-ray pulse with the cut-off energy of 100 MeV can be eventually generated in a head-on colliding configuration when the scattering laser is a linearly polarized laser. Such an isolated ultra-short polarized γ-ray source would provide critical applications in high energy physics, laboratory astrophysics and nuclear physics.

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Section: Discussionmentioning

confidence: 99%

Generation of isolated and polarized γ-ray pulse by few-cycle laser irradiating a nanofoil

Zhang¹,

Liu²,

Tang³

et al. 2022

Plasma Phys. Control. Fusion

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show abstract

“…When the spin flipper is operated in continuous mode, it can induce a coherent spin precession about the stable spin direction [4]. Expressed as a fraction of the RHIC revolution frequency, the frequency of the precession is that of the spin flipper AC dipoles, ν osc .…”

Section: Spin Tune Measurementmentioning

confidence: 99%

“…A series of such measurements have been performed at both injection and full RHIC energies [4]. This has established the nondestructive measurement of the spin tune as a tool for further investigations of beam spin dynamics.…”

mentioning

confidence: 99%

Ion Polarimetry

Schmidke

2022

Particle Acceleration and Detection

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The degree of polarization of the beams must be precisely measured, both to enable development and optimization of the beams, and to normalize the spin dependent effects observed in experiments. Ion beam polarimetry is particularly challenging since the physics processes available for polarimetry are themselves the subject of active physics research. This chapter describes ion polarimetry as implemented at the Relativistic Heavy Ion Collider (RHIC), the only high energy polarized proton collider.

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“…These bottlenecks have naturally pushed the research in ensemble control theory towards the direction of pursuing open-loop and sparsely distributed control scenarios. However, in many cutting-edge applications involving the control of ensemble systems, such as neuronal networks, robot swarms, spin ensembles, and cellular oscillators, aggregated type of spatially sparse measurements, such as coarse or fragmented images and partial snapshots, can be obtained [35,36,37,32]. The availability of such measurements then opens up the possibility for utilizing population-level feedback to close the loop in ensemble control systems.…”

Section: Introductionmentioning

confidence: 99%

Moment-Based Ensemble Control

Narayanan,

Zhang,

2020

Preprint

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Controlling a large population, in the limit, a continuum, of structurally identical dynamical systems with parametric variations is a pervasive task in diverse applications in science and engineering. However, the severely underactuated nature and the inability to avail comprehensive state feedback information of such ensemble systems raise significant challenges in analysis and design of ensemble systems. In this paper, we propose a moment-based ensemble control framework, which incorporates and expands the method of moments in probability theory to control theory. In particular, we establish an equivalence between ensemble systems and their moment systems in terms of control and their controllability properties by extending the Hausdorff moment problem from the perspectives of differential geometry and dynamical systems. The developments enable the design of moment-feedback control laws for closing the loop in ensemble systems using the aggregated type of measurements. The feasibility of this closed-loop control design procedure is validated both mathematically and numerically.

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Measurement of the Spin Tune Using the Coherent Spin Motion of Polarized Protons in a Storage Ring

Cited by 7 publications

References 26 publications

Generation of isolated and polarized γ-ray pulse by few-cycle laser irradiating a nanofoil

Generation of isolated and polarized γ-ray pulse by few-cycle laser irradiating a nanofoil

Ion Polarimetry

Moment-Based Ensemble Control

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