I am trying to understand how to use MGNCREATe (v- 4-2.1) card to define a quadrupole magnetic field, and I use this card along with the MGNFIELD card. The geometry consists of just vacuum. I have an arbitrary name (chk1) for the SDUM in the in the MGNCREAT card and I can select that in the MGNFIELD card. This produces an error,
ERROR: Unknown field specified chk1
Abort called from MFDCR reason Unknown field specified Run stopped!
STOP Unknown field specified
What am I missing here?
many thanks for all the help.