First experiments set for CEA colliding beams

The Cambridge Electron Accelerator, which has been developed into an electron–positron colliding‐beam device, is now producing electron and positron beams at 2 GeV and with peak currents of about 15 mA and is preparing for its first high‐energy experiments. To produce a collision between a positron beam and a stationary electron with the same center‐of‐mass energy, one would need a positron beam energy of 16 000 GeV.