change_particle

• type: action command.
• function: change the particle type from the default value of ``electron.''
• N.B.: this feature has had limited testing, mostly to verify that electron tracking is not impacted by the implementation. Please use with caution and be alert for suspicious results.

&change_particle
    STRING name = "electron";
    double mass_ratio = 0;
    double charge_ratio = 0;
&end

• name -- The name of the particle to use. Possible values are electron, positron, proton, muon, and custom.
• mass_ratio, charge_ratio -- If the particle name is ``custom,'' these parameters specify the mass and charge of the particle relative to the electron. E.g., for an anti-proton, one would use a mass ratio of 1836.18 and a charge ratio of 1.