calculate on-axis brilliance tuning curves for an ideal undulator insertion device (regular planar device or a helical device).
The effect of the particle beam emittance and the beam energy spread is taken into account.
Calculations are done using a Fortran program tc.f
Limitations:
The program uses the Bessel function approximation which is valid for an ideal device, e.g., no magnetic field errors.
Electron energy spread is not taken into account (for the moment).