Magnetic Field Maps

1. Use B_Map

B_Map enables axisymetrical calculation of the magnetic field and/or potential.

See this example.

The first time B_Map (or any other MagnetTools executable) is ran, a file eps_params.dat is created. It contains default parameters for the numerical integrations that are performed.

Using the default values is generally safe. So before entering the input currents for each part of the magnets, just press enter key to use the default values.

The eps_params.dat file must be included in the datasets uploaded to {mso4sc} Data Catalogue for safe operation of MagnetTools

Available options are:

 --points=STRING           points on which b field is to be computed (x0,y0,z0,...)
 --points_file=STRING      file containing points on which b field is to be computed (x0,y0,z0,...)
 --innerbore=INNERBORE     mesh on which b field is to be computed
 --potential               enable magnetic potential calculation / exclude magnetic field
 -domain                   perform calculations on whole mesh
 -per_elem                 perform calculations on node (default is on node)
 --sphharm=INT             perform calculations for Spherical Harmonic Decomposition [n n]
 --even_nlon               set even number of longitude
 --interactive             activate interactive mode
 --verbose                 activate verbose mode
 --magnet=INT              switch to magnet type (0: Bitter, 1: Unif, 2: ThinSolenoid, 3: PassiveShims)
 --mm                      force switch to mm as default units
 --r=DOUBLE                specify radius [default is 1 m]
 --restart_from=INT        restating computation of b field from node ID
 --save                    save results in file (default is off)
 --display                 display Helices data (default is off)
 --gnuplot                 Generate Helices Geometry data for Gnuplot (default is off)
 --ensight                 Generate Helices Geometry data for ensight (default is off)
 --ascii                   ascii write mode for ensight
 --num_integ=INT           specify num_integ size (default 100)
 --num_eval=INT            specify num_eval size (default 100)
 --gsl-error-handler       deactivate gsl error handler (default is on)
 --omp_off                 turn off openm

2. Use Levitation

Levitation computes Bz and its derivatives on Z-Axis using AD technics.

Available options are:

 --input=STRING                load input filename
 --order=INT                   specify order to consider (default is 6)
 --verbose                     activate verbose mode
 --no_ensight                  disable output for ensight
 --G0=DOUBLE                   specify G0 value to reach (default is 500)
 --residual_gravity=DOUBLE     specify residual gravity targetted in
                               percent (default is 1%)
 --check                       activate check mode (default is off)
 --find                        find levitation point (default is off)
 --save                        save results in file (default is off)
 --matlab                      save results in matlab/octave format
                               (default is off)
 --gsl-error-handler           deactivate gsl error handler (default is on)
 --interactive                 activate interactive mode
 --spec_vol=STRING             define spec vol (r, z) in m
 --sym                         activate sym mode
 --num_integ=INT               specify num_integ size (default 100)
 --num_eval=INT                specify num_eval size (default 100)
 --ascii                       ascii write mode for ensight
 --omp_off                     turn off openm