def METHOD_NAME(self, j, radius=0, Ip0=None):
    """
    Prescribes the desired initial current profile j_tot=j_tot(r), for
    when the electric field evolves self-consistently in time.
    """
    _data, _rad = self._setInitialData(data=j, radius=radius)
    self.jpres0 = _data
    self.jpres0_radius = _rad
    self.jpres0_Ip0 = Ip0
    self.jpres = None
    self.verifySettingsPrescribedInitialData()