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Neutrino Factory/Muon Collider Document 271-v1

Magnetic Field Maps for the RFOFO Muon Cooling Ring

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Document type:
MuCool Note
Submitted by:
John Urish
Updated by:
John Urish
Document Created:
30 Mar 2003, 12:00
Contents Revised:
30 Mar 2003, 12:00
Metadata Revised:
30 Mar 2003, 12:00
Actually Revised:
14 Sep 2006, 13:35
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Generating magnetic field maps for the RFOFO Muon cooling ring has proven
challenging. The problem is divided into several parts: (1) The primary field generator
which starts with the coil geometry and computes B(X) for an arbitrary point in the
muon-accessible volume of the ring from basic physical principles, (2) A field map
builder which uses the primary field generator to compute the field on a lattice of points,
stored on disk for later use, and (3) a secondary field generator which loads the field-on-
a-lattice into memory and interpolates in the field map to deliver B(X) to simulation
programs as quickly as possible. Extensive tests must be performed to validate the results
at every stage; these validations took far more time to program and run than did the field
generators being checked. The current release of the field map and the software to access
it is believed to be correct to about a part in ten thousand.

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