set chicane parameters

        :param bend_length: bend length, [m]
        :param bend_field: bend field, [T]
        :param drift_length: drift length, [m], list
        :param gamma: electron energy, gamma
        :return: None

def setParams(self, bend_length, bend_field, drift_length, gamma):
        """ set chicane parameters

        :param bend_length: bend length, [m]
        :param bend_field: bend field, [T]
        :param drift_length: drift length, [m], list
        :param gamma: electron energy, gamma
        :return: None
        """
        if None in (bend_length, bend_field, drift_length, gamma):
            print("warning: 'bend_length', 'bend_field', 'drift_length', 'gamma' should be positive float numbers.")
            self.mflag = False
        else:
            self._setDriftList(drift_length)
            self.gamma = gamma
            self.bend_length = bend_length
            self.bend_field = bend_field