beam section (mandatory)

Here we define the main properties of the beam at the entrance of the linac. Note that with TraceWin, most of these properties are defined within it’s own .ini file. The units must be consistent with LightWin’s system of units, see also Units and conventions.

Entry	Type	Description	Allowed values	Mandatory?
e_rest_mev	float	Rest energy of particle in \(\mathrm{MeV}\)		✅
q_adim	float	Adimensioned charge of particle		✅
e_mev	float	Energy of particle at entrance in \(\mathrm{MeV}\)		✅
f_bunch_mev	float	Beam bunch frequency in \(\mathrm{MHz}\)		✅
i_milli_a	float	Beam current in \(\mathrm{mA}\)		❌
sigma	list of list of float	Input \(\sigma\) beam matrix in \(\mathrm{m}\); \(\mathrm{rad}\)		✅

Format for the sigma entry:

sigma = [
   [ 1e-6, -2e-7,  0e+0, 0e+0,  0e+0, 0e+0],
   [-2e-7,  8e-7,  0e+0, 0e+0,  0e+0, 0e+0],
   [ 0e+0,  0e+0, -2e-7, 8e-7,  0e+0, 0e+0],
   [ 0e+0,  0e+0, -2e-7, 8e-7,  0e+0, 0e+0],
   [ 0e+0,  0e+0,  0e+0, 0e+0, -2e-7, 8e-7],
   [ 0e+0,  0e+0,  0e+0, 0e+0, -2e-7, 8e-7]
 ]