HERA LUMINOSITY UPGRADE

DESY is currently working on decreasing the size of the proton beam and of the electron beam in HERA at the col-lider experiments H1 and ZEUS by moving quadrupoles closer to the interaction points and by increasing their strength. To match the smaller proton beam size, the hor-izontal electron emittance has to be decreased by chang-ing the damping partition numbers and/or by an increase in the phase advance per FODO cell. Together with reaching design currents, these measures should increase the lumi-nosity of HERA from the current maximum value of 2 t