This is the line description of solenoids available in TRACK.
1D Solenoid
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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
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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.