RF synchronized injection from SPring-8 Linac to NewSUBARU storage ring

This paper confirms the occurrence of RF synchronized injection from SPring-8 Linac to the NewSUBARU storage ring. NewSUBARU is a 1.5 GeV storage ring with injection energy of 1.0 GeV. Besides the 1.5 GeV user mode, the ring is often operated at 1.0 GeV for EUV users with the so-called top-up injection mode. In this experiment, we use a new synchronization method developed at SPring-8, wherein an instantaneous synchronization between NewSUBARU RF (500 MHz) and Linac RF (2856 MHz) enables a buckets-to-bucket beam transfer. This is one of the key technologies of top-up operations in a storage ring that uses a linac as an injector. The RF clock and timing trigger signal are sent to the Linac from NewSUBARU, and this clock is used to delay units in order to maintain good synchronicity. This works as a standard because it has a system to compensate for transfer-time drift. The arbitrary waveform generator is another key module. It produces a clock 1/32 of that of the Linac RF using the NewSUBARU RF clock. With this system, we eliminated beam loss at the injection due to spillage from the ring RF bucket.