INCREASING THE LUMINOSITY WITH THE BEAM–BEAM INTERACTION LUMINOSITY MONITOR

At the Cornell Electron/positron Storage Ring CESR, a fast luminosity monitor has been implemented[1]. The moni-tor works by measuring the amplitude of oscillation of a given bunch while the corresponding opposing bunch is shaken. A disadvantage with the luminosity monitor is that the monitor signal, besides being a measure of the luminos-ity, is also dependent upon other factors such as the vertical tune and the vertical beta function at the IP. To overcome this deficiency, a software program has been developed to give a normalized signal that only depends upon the spe-cific luminosity. In HEP conditions, this normalized signal is used as input to an “optimizer ” program that automati-cally varies machine parameters to keep the luminosity at a maximum.