Difference between revisions of "Magnetic Field Map"
(→create field map for GEMC from possion output) |
(→convert SF7 to GEMC map) |
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For solenoid type of magnet, assume azimuthal symmetry. | For solenoid type of magnet, assume azimuthal symmetry. | ||
− | SF7 map format produced by | + | SF7 map format produced by PossionSuperfish program SF7.exe contain text lines for explanation, map range and grid size, map values (R, Z, Br, Bz, B, A, dBz/dr, dBr/dz, field index). |
GEMC map format requires R, Z, Br, Bz | GEMC map format requires R, Z, Br, Bz | ||
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put these info into database | put these info into database | ||
covert to GEMC map file CDFv2.sf7.GEMCmap ok | covert to GEMC map file CDFv2.sf7.GEMCmap ok | ||
− | + | ||
== field map file info in database == | == field map file info in database == | ||
Revision as of 23:56, 8 February 2011
Refer to the design of Solid_Magnet
create field map for GEMC from possion output
located at Solid website http://hallaweb.jlab.org/12GeV/SoLID/download/
convert SF7 to GEMC map
For solenoid type of magnet, assume azimuthal symmetry.
SF7 map format produced by PossionSuperfish program SF7.exe contain text lines for explanation, map range and grid size, map values (R, Z, Br, Bz, B, A, dBz/dr, dBr/dz, field index).
GEMC map format requires R, Z, Br, Bz
Additional difference is SF7 map values are in order of R increasing first when Z is fixed, while GEMC map values are in order of Z increasing first when R is fixed.
Thus we need the conversion script SF7toGEMCmap.C at svn "database_io/halla12/solid/field/"
for example: in terminal, run "root", then load the function ".L SF7toGEMCmap.C", covert SF7 map file CDFv2.sf7, run "SF7toGEMCmap("CDFv2.sf7"); the output should be like: open SF7 file CDFv2.sf7 ok (Rmin,Zmin) = (0.0,-300) (Rmax,Zmax) = (300,475) R and Z increments: 300 775 put these info into database covert to GEMC map file CDFv2.sf7.GEMCmap ok
field map file info in database
To make GEMC aware the field map file name, grid, position etc, we need to put those in database table "magnetic_fields"
The scripts are at svn "database_io/halla12/solid/field/"
edit the file "magnetic_fields.txt" with grid info from output of "SF7toGEMCmap.C"
no need to change "magf_table_commands"
just run "go_table_magf"