Paper |
Title |
Page |
WEPEA036 |
Spin Tune Decoherence Effects in Electro- and Magnetostatic Structures |
2579 |
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- Y. Senichev, R. Maier, D. Zyuzin
FZJ, Jülich, Germany
- N.V. Kulabukhova
St. Petersburg State University, St. Petersburg, Russia
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In Electric Dipole Moment search experiments with polarized beams the coherence of spin oscillations of particles has a crucial role. The decoherent effects arise due to spin tune dependence on particle energy and particle trajectory in focusing-deflecting fields. They are described through the n-th order spin tune aberrations. Since the first order is suppressed by RF field, the second order plays crucial role. It depends on the orbit lengthening and on the odd order field components. We consider the spin decoherence effects and methods of their compensation in different channels, electrostatic, magnetostatic linking the decoherence effects with common characteristics such as the momentum compaction factor, the chromaticity and others.
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WEPEA037 |
Testing of Symplectic Integrator of Spin-orbit Motion Based on Matrix Formalism |
2582 |
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- A.N. Ivanov, S.N. Andrianov, N.V. Kulabukhova
St. Petersburg State University, St. Petersburg, Russia
- R. Maier, Y. Senichev, D. Zyuzin
FZJ, Jülich, Germany
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Investigation of spin-orbital motion in electromagnetic fields requires different numerical methods. Approaches for long-term evolution modelling need both performance and symplecticity. In this paper we discuss matrix maps method for numerical simulation. We examine symplectification and accuracy in terms of electostatic storage ring. The results are compared with traditional symplectic step-by-step methods.
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