KEK, Ibaraki, Japan
Nagaoka University of Technology, Nagaoka, Niigata, Japan
TIT, Tokyo, Japan
SHI, Tokyo, Japan
A novel scheme of a sector cyclotron to accelerate extremely heavy cluster ions, called 'Induction Sector Cyclotron (ISC)', is described [1]. Its key feature is fast induction acceleration, which has been already demonstrated using the KEK 12 GeV proton synchrotron [2]. An ion bunch is accelerated and captured with pulse voltages generated by transformers. The acceleration and confinement in the longitudinal direction can be independently handled. The transformers are energized by the corresponding switching power supply, in which power solid-state devices are employed as switching elements and their turning on/off is maneuvered by gate signals digitally manipulated from the circulating beam signal of an ion bunch. Consequently the acceleration synchronizing with the revolution of any ion beam is always guaranteed. A cluster ion beam such as C-60, which so far there has been no way to repeatedly accelerate, can be accelerated from an extremely low velocity to a nearly light velocity. Its fundamental concept, beam dynamics, required key devices, and life time of a cluster ion beam will be discussed. A typical example of ISC is proposed at the conference.
[1] K.Takayama et al., submitted to Phys. Rev. Lett. (2010).
[2] K.Takayama et al., Phys. Rev. Lett. 98, 054801 (2007),
K.Takayama and R.Briggs (Eds.), 'Induction Accelerators' (Springer, 2010).
