The unit of directed_velocity in PICMI inputs

[tanweihou]

Hello,

In the PICMI inputs such as UniformDistribution, the unit of directed_velocity is listed as m/s.
However, in this PWFA example, the directed_velocity is 1e9 as shown in below

beam_distribution = picmi.UniformDistribution(density = 1.e23,
                                              lower_bound = [-20.e-6, -20.e-6, -150.e-6],
                                              upper_bound = [+20.e-6, +20.e-6, -100.e-6],
                                              directed_velocity = [0., 0., 1.e9])

If the unit is m/s, it is already greater than the speed of light, isn't it?
Is there a typo?
Is the unit supposed to be $\gamma\beta$?

Thanks.

[ax3l]

Oh, that is because we mean proper velocity, $\gamma(v) \cdot v$.

Let's fix that doc string in PICMI: picmi-standard/picmi#109

[tanweihou]

Thanks!