Speaker
Description
In December 2021, damage to a couple of RHIC power supplies forced
one of two Siberian Snakes in the Blue ring to operate as a partial Siberian
Snake and with a different snake axis of rotation. The time-averaged polarization for that run actually ended up higher than in the Yellow ring, after
casting the undamaged snake as a partial snake as well. In this work,
we simulate polarization transmission through a series of increasingly realistic models of the Blue ring in the “dangerous region” of polarization
loss. At first the bare lattice has a perfect closed-orbit and ideal magnet
strengths. Then the measured magnet-to-magnet field strength variations
were added to the lattice. Finally, the six Interaction Region 5mm closed
orbit bumps were implemented. Each of these model lattices compared
the use of a pair of partial snakes against a pair of a full snakes, and
in simulations with realistic emittances, realistic polarization losses were
not reproducible without inclusion of nonzero RMS lattice misalignments.
Funding Agency
Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy, and No. DE-SC0018008.
| Region represented | North America |
|---|---|
| Paper preparation format | LaTeX |
