Wideband induction acceleration and its intrinsic nature in the KEK digital accelerator

The wideband induction acceleration method makes it possible to accelerate any ion species directly from the low-energy region of several hundred kiloelectron volts in the KEK induction synchrotron. The wideband acceleration method for heavy ions in the KEK digital accelerator (KEK-DA), which is a fast cycling induction synchrotron, is presented and the experimental results are discussed. A macroparticle simulation is described that well reproduces the longitudinal beam motion of the experiment, which is characterized by a non-uniform bunch motion in the longitudinal phase space. This is caused by as an intrinsic characteristic of the current acceleration system of the KEK-DA.