## GPS Command Example 30:

# 1D accelerator beam

#

/gps/particle proton

/gps/pos/type Beam

#

# the incident surface is in the y-z plane

/gps/pos/rot1 0 1 0

/gps/pos/rot2 0 0 1

#

# the beam spot is centered at the origin and is

# of 1d gaussian shape with a 3mm central plateau

/gps/pos/shape Circle

/gps/pos/centre 0. 0. 0. mm

/gps/pos/radius 3. mm

/gps/pos/sigma_r .2 mm

#

# the beam is travelling along the x-axis with 5 degrees dispersion

/gps/ang/rot1 0 0 1

/gps/ang/rot2 0 1 0

/gps/ang/type beam1d

/gps/ang/sigma_r 5. deg

#

# the beam energy is in gaussian profile centered at 400 MeV

/gps/ene/type Gauss

/gps/ene/mono 400 MeV

/gps/ene/sigma 50. MeV

## Resulted Distribution Plots: