Physics – Accelerator Physics
Scientific paper
2004-05-20
Phys.Rev.STAccel.Beams7:121001,2004
Physics
Accelerator Physics
14 pages, 16 figures
Scientific paper
10.1103/PhysRevSTAB.7.121001
Accelerating polarized proton beams and storing them for many turns can lead to a loss of polarization when accelerating through energies where a spin rotation frequency is in resonance with orbit oscillation frequencies. First-order resonance effects can be avoided by installing Siberian Snakes in the ring, devices which rotate the spin by 180 degrees around the snake axis while not changing the beam's orbit significantly. For large rings, several Siberian Snakes are required. Here a criterion will be derived that allows to find an optimal choice of the snake axes. Rings with super-period four are analyzed in detail, and the HERA proton ring is used as an example for approximate four-fold symmetry. The proposed arrangement of Siberian Snakes matches their effects so that all spin-orbit coupling integrals vanish at all energies and therefore there is no first-order spin-orbit coupling at all for this choice, which I call snakes matching. It will be shown that in general at least eight Siberian Snakes are needed and that there are exactly four possibilities to arrange their axes. When the betatron phase advance between snakes is chosen suitably, four Siberian Snakes can be sufficient. To show that favorable choice of snakes have been found, polarized protons are tracked for part of HERA-p's acceleration cycle which shows that polarization is preserved best for the here proposed arrangement of Siberian Snakes.
No associations
LandOfFree
Optimal Axes of Siberian Snakes for Polarized Proton Acceleration does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Optimal Axes of Siberian Snakes for Polarized Proton Acceleration, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optimal Axes of Siberian Snakes for Polarized Proton Acceleration will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-552286