Adjust the accelerating field of the cavity by the value of ``scalingFactor``.
        The adjustment is multiplicative, so a value of ``scalingFactor = 1.0`` will result
        in no change of the field.

def scaleField(self, scalingFactor):
        """
        Adjust the accelerating field of the cavity by the value of ``scalingFactor``.
        The adjustment is multiplicative, so a value of ``scalingFactor = 1.0`` will result
        in no change of the field.
        """
        oldField = self.fieldReduction.val
        newField = 100.0 * (scalingFactor * (1.0 + oldField/100.0) - 1.0)
        self.fieldReduction = self.fieldReduction._replace(val = newField)