Short manual on how to use the field conversion code "Poisson_To_TRACK" on this page:
        
  http://www.phy.anl.gov/atlas/TRACK/Trackv39/Windows/Field-Conversion/Poisson_To_TRACK/
   
I recommed that you use the full geometry in Poisson, not 1/2 or 1/4 assuming symmetry.
 
The lines in the input file "poisson_to_track.dat" are as follows:

  (There is a short description in front of the input value on the same line)
 
  line-1: Name of file to read = Poisson output file name

  line-2: Input Field type: 0:E, 1:B. This is a flag to tell the code if the field 
         from Poisson is E or B. Later we'll add the possibility of combining two files 
         one for E and one for B to produce a single file for elements with both fields.

  line-3: Input Field symmetry key in Z. This is in case the field files were 
         generated using given symmetries in Poisson otherwise set it to 0.
          The possible values are
             0: No symmetry in Z
             1: Odd symmetry for the input field in the Z direction: F(-z) = -F(z).
             2: Even symmetry for the input field in the Z direction: F(-z) = F(z).
          But you better calculate the full geometry with Poisson and use 0 to avoid 
         confusion.

  line-4: Track Field file number: 1,2,... This is the extension or the number "nn" of 
         the output file eh_EMS.#nn = TRACK input.

  line-5: Track Field file format: 0, 1 or 2. Now we have only the binary format 
         available, that is 0. We'll add other formats later.

  line-6: Track Field symmetry keys in X, Y & Z. If the geometry is symmetric we can take
         advantage of that to have a finer field grid in TRACK. But you better use 0,0,0 
         to avoid confusion.

  line-7: Element/Field length in cm. This is the field length in cm to consider in the 
         output file. This allows some flexibility to adjust the element length in TRACK.

  line-8: Element/Field aperture in cm. This is the field aperture in cm to consider in the 
         output file. This allows some flexibility to adjust the element aperture in TRACK.

  line-9: Electric field normalization for Emax=1. This is a scaling factor to normalize 
         the max E field to 1. The real field strength should be input in the 
         corresponding element line in the "sclinac.dat" file when runing TRACK.

  line-10: Magnetic field normalization for Bmax=1. This is the same as line-9 but for 
         B field.
  
Please let me know if there is a problem with the code, or if you run into trouble when 
using symmetries for the input or output field files.
 
This Example: A Solenoid field file generated by Poisson using Z symmetry.