Compact Storage Ring for Far-Infrared Coherent Synchrotron Radiation Source

Abstract

We present the results of design studies for a compact storage ring that may produce coherent synchrotron radiation in the far-infrared frequency range. The momentum compaction factor in the ring is easily varied by controlling dispersion function and thus a short bunch length of a few picoseconds can be achieved. We have performed a detailed analysis of beam dynamics for a short bunch length in the ring. Within the controllable range of the second-order momentum compaction factor in the ring, it was shown that the alpha bucket and the rf bucket were created. It is shown that the compact ring with conservative machine errors has a sufficient dynamic aperture after the correction of closed orbit distortion. Multi-particle tracking simulations are performed to investigate longitudinal beam instability due to the broadband impedance in the ring. We investigated the effects of coherent synchrotron radiation wake in the ring on longitudinal beam distribution. From these studies, it is shown that the designed compact ring may provide stable electron beams of approximately around 2 ps rms.