We have been developing a compact ion accelerator system for evaluating potential health risks of radiation exposure against ion beams. In order to realize the compact ion accelerator, we adopted a dielectric wall accelerator (DWA) concept for beam acceleration. The DWA system uses photoconductive semiconductor switch (PCSS) driven high voltage transmission lines to generate pulsed electric fields on the inside of a high gradient insulating (HGI) acceleration tube. A prototype of a carbon ion injector using a laser ion source and a DWA type accelerating module has been developing at KEK. At the conference, we will report the design of this system and the latest experimental results of the performance tests of PCSS and high voltage generation.