code: def scaleField(self, scalingFactor):
          
          oldField = self.fieldReduction.val
          newField = 100.0 * (scalingFactor * (1.0 + oldField/100.0) - 1.0)
          self.fieldReduction = self.fieldReduction._replace(val = newField)
docs: 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.