RESULTS OF FINAL FOCUS TEST BEAM

The beam experiments of Final Focus Test Beam(FFTB) started in September 1993 at SLAC, and have produced a 1:7 m 75 nm spot of 46 GeV electron beam. A number of new tech-niques involving two nanometer spot-size monitors have been developed. Several beam diagnostic/tuning schemes are applied to achieve and maintain the small spot. This experiment opens the way toward the nanometer world for future linear colliders. I. GOAL OF FFTB A small spot size is the most important key to enhance the luminosity of an e+e linear collider. Up to now, most plans of future linear colliders at 0.5±1 TeV center of mass assume a vertical spot size below 10 nm either as the standard or up-graded design number. A very ¯at beam with an aspect ratio more than 100 will be favored to reduce various beam-beam ef