Journal ArticleDOI
Suppressing intrinsic spin harmonics at the cooler synchrotron COSY
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TLDR
In this article, a modified beam optics was found which significantly lowers the strength of these intrinsic resonances at the COSY synchrotron, which allowed internal experiments to take data in the whole acceleration ramp.Abstract:
Accelerating a polarized beam in a synchrotron requires the highest possible superperiodicity of the lattice in order to minimize the number of depolarizing intrinsic resonances. However, at the cooler synchrotron COSY the standard lattice to accelerate the beam to maximum momentum has a reduced superperiodicity since the harmful transition energy is shifted upwards during acceleration. This procedure allows internal experiments to take data in the whole acceleration ramp. Unfortunately the reduced superperiodicity excites additional intrinsic resonances. To solve this contrary situation a modified beam optics was found which significantly lowers the strength of these intrinsic resonances. Measurements confirming this theoretical concept are presented.read more
Citations
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Journal ArticleDOI
Spin resonance strength of a localized rf magnetic field
TL;DR: In this article, the authors discuss the debated factor of 2, and provide a formula to calculate the component enhanced by the induced betatron motion, which can be used to estimate the spin-resonance strength produced by a localized rf field.
Journal ArticleDOI
Spin coupling resonance and suppression in the AGS
V. H. Ranjbar,S. Y. Lee,L. A. Ahrens,M. Bai,Kevin Brown,W. Glenn,H. Huang,A. U. Luccio,W.W. MacKay,Vadim Ptitsyn,T. Roser,N. Tsoupas +11 more
TL;DR: In this article, a method to cure coupled spin resonances in the AGS via spin matching rather than global or local decoupling was explored, using the new DEPOL program.
Proceedings ArticleDOI
Status of the cooler synchrotron Cosy-Juelich
D. Prasuhn,Ulf Bechstedt,J. Dietrich,Ralf Gebel,K. Henn,Andreas Lehrach,Bernd Lorentz,R. Maier,A. Schnase,H. Schneider,Rolf Stassen,H. J. Stein,Hans Stockhorst,R. Toelle +13 more
TL;DR: The COSY Synchrotron Cooler as mentioned in this paper delivers unpolarized and polarized protons and deuterons in the momentum range 300 MeV/c up to 3.65 GeV/C. The beam is fed to external experiments by a fast kicker extraction or by stochastic extraction.
Journal ArticleDOI
Calculation of higher order nonradiative spin resonance strengths in circular accelerators
TL;DR: In this paper, a perturbative formalism is employed to calculate the strength of first and higher order nonradiative spin resonance strengths in a storage ring, including full strength Siberian Snakes.
References
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Journal ArticleDOI
Precession of the Polarization of Particles Moving in a Homogeneous Electromagnetic Field
TL;DR: In this article, the precession of a particle moving in a homogeneous electromagnetic field has been investigated for spin ½ particles in some particular cases and the results were derived by explicit use of the Dirac equation with the occasional inclusion of a Pauli term to account for an anomalous magnetic moment.
Journal ArticleDOI
Cooler synchrotron COSY — Performance and perspectives
TL;DR: COSY as mentioned in this paper is a synchrotron and storage ring delivering protons with momenta between 300 MeV/c and 3300 GeV /c for experiments in medium energy physics.
Journal ArticleDOI
Proton-Proton Elastic Scattering Excitation Functions at Intermediate Energies
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TL;DR: In this paper, the excitation functions of proton-proton elastic scattering cross sections have been measured in narrow steps for projectile momenta p{sub p} (energies T{subp}) from 1100 to 3300MeV/c (500 to 2500MeV) in the angular range 35{degree}{le}{Theta}{sub c.m.
ReportDOI
Acceleration of polarized protons in circular accelerators
E.D. Courant,R.D. Ruth +1 more
TL;DR: In this paper, the theory of depolarization in circular accelerators is presented, where the spin equation is first expressed in terms of the particle orbit and then converted to the equivalent spinor equation.
Proceedings ArticleDOI
Operation of the AGS polarized beam
TL;DR: The tune-up period preceding the polarized proton physics run during January of 1988 at the Brookhaven AGS is reviewed in this paper, with a focus on the tuning of the tuning phase.
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