Commissioning of aurora: The smallest synchrotron light source

The first synchrotron light from the smallest storage ring Aurora was observed on November 2, 1989. We have established a half‐integer‐resonance injection method. The electron energy is successfully boosted up to 650 MeV without exciting the prepared resonance jumper. The stored current is presently limited by performance of the injector microtron which produces 10 μA on average, but we could accumulate 45 mA because of very large acceptance of the ring. The measured lifetime is 20 h when the vacuum pressure is better than 1×10−9 Torr. The observed beam size is 1.2(0.14) mm in radial (vertical) direction. Remodeling of the injector is in progress.