This is the line description of solenoids available in TRACK.

1D Solenoid
-----------

n    sol   Bf   phy_len  eff_len   rap   nstep

n           : Solenoid Type;

              n = 0: Internal TRACK Solenoid models

                 If eff_len = phy_len --> Hard-Edge Model.
                   If nstep=0, a transfer matrix is used without SC calculation.
                   If nstep>0, a uniform field is used for integration with SC.
                 If eff_len < phy_len --> Fringe-Field Model.
                   If nstep=0, iint in "track.dat" is used nstep=iint.
                   If nstep>0, nstep is used as an integration step.
                    		 
                 The internal fringe field model uses Enge coefficients for the 
                fall-off of edge fields to generate the field profile Bz(z).

                 The parameters of the model (Enge coefficients) can be adjusted 
                using the "enge" element in "sclinac.dat" file just before the 
	        "sol" line. If not specified, the internal default Enge 
		coefficients will be used for both the entrance and exit of 
		the solenoid.

		 To input your own values of Enge coefficients, insert these 
                two lines before the "sol" line in "sclinac.dat":

                  1  enge sol EC1  EC2  EC3 EC4  EC5  EC6
                  2  enge sol EC1  EC2  EC3 EC4  EC5  EC6

                 Where "1" is for the solenoid entrance and "2" is for the 
                solenoid exit. EC1-6 are the new values for the 6 Enge 
	        coefficients to be used instead of the default internal values 
	        given in the line below:

                  1  enge sol -0.00004  4.518219  0.  0.  0.  0.
	       
                 If only one "enge" line is entered it will be used for both the 
                entrance and exit of the solenoid.

              n > 0: Solenoid with External 1D field profile.

	        If the external field file Solenoid.#nn exists, the data will 
               be used for the profile of Bz(z).

	        If Not, the code will stop and request the missing file 
               Solenoid.#nn.

Bf       [G]: Field strength

phy_len [cm]: Physical length

eff_len [cm]: Effective length

rap     [cm]: Aperture radius

nstep       : (optional) Number of integration steps.

               For n=0 and eff_len=phy_len (-> Hard-Edge Model), nstep should be 
              non 0 to include space charge effects with integration. If nstep=0 
              or not specified, a transfer matrix is used without SC calculation.

3D Solenoid
-----------

n    sol3d   Bf   len   rap   nstep

n           : Solenoid Type; it is also the external EMS field file number 
             eh_EMS.#nn which sould exist.

Bf       [G]: Field strength

len     [cm]: Solenoid/Field length

rap     [cm]: Aperture radius

nstep       : (optional) Number of integration steps.