Astra simulation.in -------------------------------------------------------------------------- Astra - A space charge tracking algorithm Version 3.2 DESY, Hamburg 2011 12. 2.2020 12: 6 Parameter file is: simulation.in WiFEL + 650 MHz: for ANL-CWA driver Initialize element settings: -------------------------------------------------------------------------- Aperture: -------------------------------------------------------------------------- Cavity: Reading cavity field data from: srfgun.txt field smoothing is applied Cavity Frequency f = 0.1996 GHz maximum gradient 40.00 MV/m at 0.000 m estimated average gradient 9.428 MV/m nominal phase 1.444 deg -------------------------------------------------------------------------- Solenoid: Reading solenoid field data from: solenoid.txt field smoothing is applied maximum |Bz| field 0.2061 T at 0.3100 m integral Bz squared 2.9398E-03 T^2m -------------------------------------------------------------------------- 20001 particles from file particle.ini Cathode located at: z = 0.000 m Particles taken into account N = 20001 total charge Q = -10.00 nC horizontal beam position x = -3.8877E-09 mm vertical beam position y = -2.2835E-09 mm longitudinal beam position z = 0.000 m horizontal beam size sig x = 1.528 mm vertical beam size sig y = 1.529 mm longitudinal beam size sig z = 0.000 mm total emission time t = 8.9670E-02 ns rms emission time sig t = 2.1247E-02 ns average kinetic energy E = 2.1995E-06 MeV energy spread dE = 1.1664E-05 keV average momentum P = 1.4993E-03 MeV/c transverse beam emittance eps x = 0.1738 pi mrad mm correlated divergence cor x = -1.6873E-03 mrad transverse beam emittance eps y = 0.1738 pi mrad mm correlated divergence cor y = 1.6870E-03 mrad longitudinal beam emittance eps z = 0.000 pi keV mm correlated energy spread cor z = 0.000 keV emittance ratio eps y/eps x = 1.000 WARNING: Bz is not zero at the cathode, estimated emittance contribution: eps x = 0.1737 pi mrad mm eps y = 0.1738 pi mrad mm -------------------------------------------------------------------------- Start auto phasing: Scan cavity number : 1 6 unstable trajectories out of 50 Cavity phasing completed: Cavity number Energy gain [MeV] at Phase [deg] 1 3.927 251.71 -------------------------------------------------------------------------- on axis tracking of the reference particle: initial position z = 0.000 m x = 0.000 mm y = 0.000 mm initial momentum p = 7.4966E-04 MeV/c global phase shift phi = 0.000 deg time step for integration dt = 2.000 ps -------------------------------------------------------------------------- Online element settings: -------------------------------------------------------------------------- particle reaches position z = 1.020 m time of flight is t = 3.466 ns final momentum p = 4.408 MeV/c final phase (cavity 1) phi_end = 257.7 deg -------------------------------------------------------------------------- off axis tracking of the reference particle: initial position z = 0.000 m x = 1.528 mm y = 1.529 mm final position x = 0.1458 mm y = 2.350 mm divergence px/pz = -0.2260 mrad py/pz = -3.709 mrad -------------------------------------------------------------------------- tracking of 20001 particles : tracking will stop at z = 1.020 m space charge forces are INCLUDED cylindrical symmetric algorithm mirror charges at the cathode are taken into account mirror charge switched off at: 0.2277 m final checkpoint at z = 1.020 m total number of iteration steps: 3218 ********************************************************************** Particles taken into account N = 20001 total charge Q = -10.00 nC horizontal beam position x = -7.7173E-03 mm vertical beam position y = -1.0303E-02 mm longitudinal beam position z = 1.020 m horizontal beam size sig x = 5.284 mm vertical beam size sig y = 5.282 mm longitudinal beam size sig z = 7.013 mm average kinetic energy E = 3.926 MeV energy spread dE = 43.53 keV average momentum P = 4.408 MeV/c transverse beam emittance eps x = 22.56 pi mrad mm correlated divergence cor x = -2.564 mrad transverse beam emittance eps y = 22.53 pi mrad mm correlated divergence cor y = -2.558 mrad longitudinal beam emittance eps z = 237.8 pi keV mm correlated energy spread cor z = 27.30 keV emittance ratio eps y/eps x = 1.001 Particle Statistics: Total number of particles on stack = 20001 Electrons (total) = 20001 particles at the cathode = 0 active particles = 20001 passive particles (lost out of bunch) = 0 probe particles = 0 backward traveling particles = 0 particles lost with z