Abstract
A fast-cycling induction synchrotron was demonstrated. Ions with extremely low energies and mass-to-charge ratios ($A/Q$) in the range from 2 to 10 were injected, captured by barrier voltages, and accelerated to the end of the acceleration cycle of 50 ms by flat pulse voltages generated by pulse transformers referred to as induction cells. Induction acceleration in a wide dynamic frequency range of 56 kHz to 1 MHz was also demonstrated. This accelerator is expected as the next generation of a heavy ion driver for cancer therapy, where a large scale injector is not required. A wide variety of ions for ion energy implantation experiments needing novel materials will be delivered from this compact circular accelerator.
Highlights
The KEK digital accelerator (DA) is a small-scale induction synchrotron that does not require a high-energy injector [1]
Instead of a rf cavity typically seen in rf synchrotrons, an induction cell (IC) is employed as the acceleration device, which is a one-to-one pulse transformer energized by a switching power supply (SPS) generating pulse voltages
The most important feature of the induction synchrotron is that voltage timing is controlled by a gate signal for solid-state switching elements; this gate signal is generated by an intelligent gate controller
Summary
The KEK digital accelerator (DA) is a small-scale induction synchrotron that does not require a high-energy injector [1]. The electrostatic kicker voltage is turned off before the injected beam pulse completes a single turn in the DA ring [1], which is a fastcycling synchrotron operated at 10 Hz. The injected beam is captured with a pair of barrier voltage pulses and accelerated with other pulse voltages generated in the ICs. Certain important aspects of the induction acceleration of lowenergy ions with mass-to-charge ratios (A=Q) in the range from 2 to 8 in the KEK-DA are described in this paper, with particular focus on induction acceleration in a wide dynamic frequency range (82 kHz → 1 MHz) in the fast-cycling synchrotron and the intrinsic issues concerning the beam physics associated with acceleration from low energies. Details of the corrected procedure and its result have been discussed elsewhere [11]
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