The Princeton Pennsylvania Accelerator

The Princeton‐Pennsylvania Accelerator is a 3‐billion‐electron‐volt proton synchrotron which is unique amongst large proton accelerators in that the pulse rate of 19 cycles per second is nearly 100 times higher than that usually used. Though the machine is still being tuned up, an intensity of $6×1010 protons/pulse,$ or about $1.2×1012 protons/second$ has already been reached, with considerably higher currents in prospect.