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Optics and Field Error Compensation in the FNAL Permanent Magnet 8.9 GeV/c Proton Transfer Line

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Submitted by:
Ruth A. Becker
Updated by:
Monica A Neuffer
Document Created:
27 Dec 2002, 15:05
Contents Revised:
17 Jul 2003, 11:35
Metadata Revised:
17 Jul 2003, 11:35
Actually Revised:
17 Jul 2003, 11:40
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27 Dec 2002, 15:05
Protons are transported 760 m from the Booster extraction point to injection into the Fermilab Main Injector. Apart from two,
comparatively short, specialized optical matching sections the transfer lattice is described by 90o betatron phase advance arc cells and
missing-dipole dispersion suppressing cells. This repetitive structure, combined with the small average bend per cell makes it feasible to
construct this section exclusively from low-field permanent dipoles and gradient magnets. The permanent magnet section is nearly devoid of
powered correctors: trajectory control and momentum error compensation is accomplished instead by moving select gradient magnets
transversely. Permanent magnets are being used in the transfer line primarily to acquire the manufacturing and operational experience
necessary to ensure success of the future FNAL Recycler Ring.
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