Tolerance of Beam Extraction Elements for the AGS Booster

Abstract

We analyzed the sensitivity of the beam extraction for the AGS Booster. We found that (1) the systematic difference of the slopes of the extraction orbits between heavy ion and proton should be compensated properly by the septum about ± 0.27 mr. (2) the orbit at the stripper location is sensitive to the focusing quadrupole QF2. Assuming a ± 1% error in the kicker and 0.1% in the septum, we expect yms orbit excursion of 2.8 mm at the stripper location. Since the orbit error depends on the kicker and septum excitations, orbit correction will not be useful. Yet ± 2.8 mm orbit error should be tolerable. Improvement on kicker and septum stability would certainly be helpful also.

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