&bmad_to_gpt_params
  bmad_lat_filename = 'lat.bmad'

  gpt_lattice_param%field_map_dimension = 2
  gpt_lat_param%header_file_name = 'gpt_header.in'
  gpt_lat_param%tracking_end_element = ''   ! Blank means all elements translated.

  write_gpt_particles = .true.
  write_time_particles = .true.
  beam_init%bunch_charge = 1.0e-9
  beam_init%n_particle = 27
  beam_init%distribution_type(1) = 'GRID'
  beam_init%distribution_type(2) = 'GRID'
  beam_init%distribution_type(3) = 'GRID'
  beam_init%grid(1)%n_x = 3
  beam_init%grid(1)%n_px = 1
  beam_init%grid(1)%x_min = -1e-3
  beam_init%grid(1)%x_max =  1e-3
  beam_init%grid(2)%n_x = 3   
  beam_init%grid(2)%n_px = 1
  beam_init%grid(2)%x_min = -1e-3
  beam_init%grid(2)%x_max =  1e-3
  beam_init%grid(3)%n_x = 3
  beam_init%grid(3)%n_px = 1
  beam_init%grid(3)%x_min =  1e-6
  beam_init%grid(3)%x_max =  2e-6
  beam_init%n_bunch = 1
/