CERN: More collisions for LEP

With CERN's LEP electron-positron collider now routinely operating in 'preztel' mode with eight interleaved bunches per beam (October 1992, page 17) and with operations crews mastering the delicate handling of the machine's beam orbits, luminosity has gone beyond 2 x 10³¹ cm^-2s^-1, substantially improving over the machine's design luminosity figure of 1.7 x 10³¹. At the end of August, integrated luminosity at LEP (a measure of the total number of electron-positron collisions) had aiready surpassed the 1993 score (which amassed 3 million Zs), promising an excellent harvest for this year, with the total number of Zs seen since 1989 by ail four experiments nearing 15 million