Return the Pynac representation of this Set4DAperture instance.

def dynacRepresentation(self):
        """
        Return the Pynac representation of this Set4DAperture instance.
        """
        details = [
            self.voltage.val,
            self.phase.val,
            self.harmonicNum.val,
            self.apertureRadius.val,
        ]
        return ['BUNCHER', [details]]