Speaker
Description
The Booster for the Alternating Gradient Synchrotron (AGS) pre-accelerates
polarized beams from a kinetic energy as low as 2 MeV/u, up to a nominal
extraction kinetic energy of 1.4 GeV/u. Due to the large energy range, a tra-
ditional partial snake is not practical, as the horizontal and vertical apertures
are filled at low energies. A design that allows the partial snake strength to
ramp to its desired setting and maximize the available aperture, all within the
sub 100 ms acceleration cycle of the Booster is essential. This design is investi-
gated as an alternative to the existing polarized ion configurations with relevant
comparisons. The proposed design excites a helical orbit to produce a rotation
of the stable spin direction similar to a partial snake. The primary purpose of
a snake is to eliminate imperfection spin resonances, and if νy̸= νs, vertical
intrinsic resonances can also be avoided.
Funding Agency
Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
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