
Electron Beam Parameters
GAMMA0
The mean energy of the electron beam in terms of the electron rest mass energy.
DELGAM
The RMS value of the energy distribution in terms of electron rest mass energy.
XBEAM
Transverse position in x of the electron beam at the undulator entrance with respect to the undulator axis.
YBEAM
Transverse position in y of the electron beam at the undulator entrance with respect to the undulator axis.
PXBEAM
Average normalized transverse momentum x of the electron beam at the undulator entrance. The momenta are defined as PXBEAM = _{x} where _{x} = cv_{x} is the average transverse velocity and the Lorenz factor of the electron energy.
PYBEAM
Average normalized transverse momentum in y of the electron beam at the undulator entrance. See PXBEAM for more information.
CURPEAK
Peak current of the electron beam. Timeindependent simulations enforces a constant current.
CUTTAIL
Cut in the transverse phase space in measures of the rms size to collimate transverse beam tails/halos. The cut is applied after the loading and beam current is set accordingly to the reduced number of macro particles. It is disabled if the value is negative or the electron beam is imported from an external file.
CONDITX
CONDITX is the correlation strength between the amplitude of the eletron's betatron oscillation and its energy. If the condition is applied correctly any emittance effects are removed from the FEL amplification and the focal strength can be increased. However it requires a conditioning beamline prior to the FEL to apply the correlation. Refer to the paper of Sessler (A.N. Sessler, et al., Phys. Rev. Lett 68 (1992) 309) for more information.
EMOD
Initial energy modulation, when quite loading is used. The value is the modulation amplitude in terms of gamma. 