A LASER-BASED BEAM PROFILE MONITOR FOR THE SLC SLD INTERACTION REGION/

Beam size estimates made using beam-beam deflections are used for opti mization of the Stanford Linear Collider (SLC) electron-positron beam sizes. Typical beam sizes and intensities expected for 1996 operations are 2.1 x 0.6 mu m (x,y) at 4.0 x 10(10) particles per pulse. Convent ional profile monitors, such as scanning wires, fail at charge densiti es well below this. The laser-based profile monitor uses a finely-focu sed 350-nm wavelength tripled YLF laser pulse that traverses the parti cle beam path about 29 cm away from the e(+)/e(-) IF. Compton scattere d photons and degraded e(+)/e(-) are detected as the beam is steered a cross the laser pulse. The laser pulse has a transverse size of 380 nm and a Rayleigh range of about 5 mu m.