scisalt.PWFA.Ions2D¶

class scisalt.PWFA.Ions2D(species, N_e, sig_r, sig_xi, r0_big=None, n_samp=1000, order=5, rtol=None, atol=None)[source]¶

A class to facilitate calculating ion motion in PWFA ion columns due to cylindrical, infinitely-long gaussian beams.

New in version 1.6.

Attributes

`A`	Ion mass in units of AMU.
`N_e`	Number of electrons in bunch.
`atol`
`dims`	Number of dimensions.
`k`	Driving force term: $r'' = -k \left( \frac{1-e^{-r^2/2{\sigma_r}^2}}{r} \right)$
`k_small`	Small-angle driving force term: $r'' = -k_{small} r$ .
`lambda_small`	The wavelength for small ( $r_0 < \sigma_r$ ) oscillations.
`m`	Ion mass.
`nb0`	On-axis beam density $n_{b,0}$ .
`q_label`
`rtol`
`sig_r`	Transverse R.M.S.
`sig_xi`	Longitudinal R.M.S.
`species`	The species of gas used (see `periodictable.core.Element`).

Methods

`h`(q)
`lambda_large`(r0)	The wavelength for large ( $r_0 < \sigma_r$ ) oscillations.
`omega_big`(q0)
`q`(x, q0)	Numerically solved trajectory function for initial conditons $q(0) = q_0$ and $q'(0) = 0$ .
`r_large`(x, r0)	Approximate trajectory function for large ( $r_0 > \sigma_r$ ) oscillations.
`r_small`(x, r0)	Approximate trajectory function for small ( $r_0 < \sigma_r$ ) oscillations.