Muon Accelerator Program (MAP)

U.S. Department of Energy

Muon Accelerator Program Document 4341-v1

Simulations of Field Errors in IR magnets of a Muon Collider using MAD-X and COSY codes

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Yuri Alexahin
Updated by:
Yuri Alexahin
Document Created:
29 Jun 2012, 14:47
Contents Revised:
29 Jun 2012, 14:47
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29 Jun 2012, 14:47
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In order to achieve peak luminosity of a Muon Collider (MC) in the 10^35 cm-2s-1 range very small values of beta-function at the interaction point (IP) are necessary ( < 1 cm) while the distance from IP to the first quadrupole can not be made shorter than ~6m as dictated by the necessity of detector protection from backgrounds. In the result the beta-function at the final focus quadrupoles can reach 100 km making beam dynamics very sensitive to all kind of errors.
In the present report we consider the effects on momentum acceptance and dynamic aperture of multipole field errors in the body of IR dipoles as well as of fringe-fields in both dipoles and quadrupoles in the case of 1.5 TeV (c.o.m.) MC. Analysis shows these effects to be strong but correctable with dedicated multipole correctors.
Simulations presented in the report are performed using MAD-X code. One of the goals of this study was testing and adaptation of MAD-X code for MC simulations, and also demonstration of the MAD-X code ability to be the “all-in-one” code for MC lattice design and simulations.
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