Flat beam spot sizes measurement in the SLC-final focus

With the switch to flat beam operation in the SLC during the 1993 run, it has become necessary to develop an algorithm that is capable of measuring the beam spot sizes at the Final Focus Interaction Point (IP). This algorithm uses the correct beam-beam deflection formula for the more general flat-beam case, since the round beam approximation is no longer valid. The application of this formula to the IP spot size measurements in the SLC Final Focus is the subject of this paper.