Difference between revisions of "Magnetic Field Map"
(→convert SF7 to GEMC map) |
|||
Line 9: | Line 9: | ||
*[http://hallaweb.jlab.org/12GeV/SoLID/download/solenoid_ZEUS.dat ZEUS map] | *[http://hallaweb.jlab.org/12GeV/SoLID/download/solenoid_ZEUS.dat ZEUS map] | ||
− | == convert SF7 to GEMC map == | + | == SF7toGEMCmap.C == |
+ | |||
+ | checkout from svn "database_io/halla12/solid/field/" | ||
+ | |||
+ | or | ||
+ | |||
+ | download https://clas12svn.jlab.org/repos/trunk/clas12/gemc/production/database_io/halla12/solid/field/SF7toGEMCmap.C | ||
+ | |||
+ | === convert SF7 to GEMC map === | ||
For solenoid type of magnet, assume azimuthal symmetry. | For solenoid type of magnet, assume azimuthal symmetry. | ||
Line 19: | Line 27: | ||
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. | 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 | + | Thus we need the conversion script |
+ | |||
for example: | for example: | ||
To covert SF7 map file CDFv2.sf7, start root and run ".x SF7toGEMCmap.C("CDFv2.sf7")", | To covert SF7 map file CDFv2.sf7, start root and run ".x SF7toGEMCmap.C("CDFv2.sf7")", | ||
Line 31: | Line 40: | ||
covert to GEMC map file CDFv2.sf7.GEMCmap ok | covert to GEMC map file CDFv2.sf7.GEMCmap ok | ||
− | == plot SF7 map and integrate over B == | + | === plot SF7 map and integrate over B === |
− | SF7toGEMCmap.C( | + | SF7toGEMCmap.C(options) |
options: | options: | ||
"SF7_filename" convert map only | "SF7_filename" convert map only |
Revision as of 00:47, 17 March 2011
Refer to the design of Solid_Magnet
Contents
create field map for GEMC from possion output
located at Solid website http://hallaweb.jlab.org/12GeV/SoLID/download/
SF7toGEMCmap.C
checkout from svn "database_io/halla12/solid/field/"
or
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
for example: To covert SF7 map file CDFv2.sf7, start root and run ".x SF7toGEMCmap.C("CDFv2.sf7")", the output should be like: open SF7 file CDFv2.sf7 ok Rmin 0 Zmin -300 Rmax 300 Zmax 475 R and Z increments: 300 775 please put 301 776 instead into database the units are in cm and G covert to GEMC map file CDFv2.sf7.GEMCmap ok
plot SF7 map and integrate over B
SF7toGEMCmap.C(options)
options: "SF7_filename" convert map only "SF7_filename",1 convert map and show map plot "SF7_filename",2 show map plot only "SF7_filename",3,x1,y1,x2,y2 show map plot and integrate over B along the line (x1,y1)-(x2,y2)
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"
just run "go_table_magf magnetic_fields.txt user_geometry"