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| THPC007 |
Permanent Magnet Skew Quadrupoles for the Low Emittance LER Lattice of PEP-II
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2987 |
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- F.-J. Decker, S. D. Anderson, D. Kharakh, M. K. Sullivan
SLAC, Menlo Park, California
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The vertical emittance of the low energy ring (LER) in the PEP-II B-Factory was reduced by using skew quadrupoles consisting of permanent magnet material. The advantages over electric quadrupoles or rotating existing normal quadrupoles are discussed. To assure a high field quality a Biot Savart calculation was used to cancel the natural 12-pole component by using different size poles over a few layers. A magnetic measurement confirmed the high quality of the magnets. After installation and adjusting the original 12 skew and 16 normal quadrupoles the emittance contribution from the region close to the interaction point, which was the biggest part in the original design, was considerably reduced.
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